<appendix xmlns="http://docbook.org/ns/docbook" xml:id="appendix.gpio_switcher_devices">
  <title>Supported GPIO/Switcher Devices</title>
  <para>
    The following GPIO/switcher devices are supported under Rivendell:
  </para>
  <sect1 xml:id="sect.gpio_switcher_devices.am16">
    <title>360 Systems AM-16/B Audio Crosspoint Switcher</title>
    <variablelist>
      <varlistentry>
	<term>Driver Name:</term>
	<listitem>
	  <para>
	    360 Systems AM-16/B
	  </para>
	</listitem>
      </varlistentry>
      <varlistentry>
	<term>Supported RML Commands:</term>
	<listitem>
	  <para>
	    <simplelist>
	      <member>Switch Take ['<command>ST</command>']</member>
	    </simplelist>
	  </para>
	</listitem>
      </varlistentry>
    </variablelist>
      <para>
	Control is done by means of MIDI connections to the 'MIDI IN' and
	'MIDI OUT' ports on the back of the unit, with the appropriate
	MIDI device specified in the
	<computeroutput>Device:</computeroutput> field in
	<code>RDAdmin->ManageHosts->Switchers/GPIO</code>.
	The following settings should be configured on the AM-16/B:
      </para>
      <variablelist>
	<varlistentry>
	  <term>Control Port Type:</term>
	  <listitem>
	    <para>
	      MIDI (jumper JMP1)
	    </para>
	  </listitem>
	</varlistentry>
	<varlistentry>
	  <term>Program Send:</term>
	  <listitem>
	    <para>
	      OFF
	    </para>
	  </listitem>
	</varlistentry>
	<varlistentry>
	  <term>Receive Channel: o</term>
	  <listitem>
	    <para>
	      o (Omni mode)
	    </para>
	  </listitem>
	</varlistentry>
	<varlistentry>
	  <term>Memory Protect:</term>
	  <listitem>
	    <para>
	      OFF
	    </para>
	  </listitem>
	</varlistentry>
      </variablelist>
      <para>
	The driver uses MIDI programs '0' and '1' on the AM-16/B when
	processing crosspoint changes; anything previously saved in
	those programs will be overwritten!
      </para>
  </sect1>

  <sect1 xml:id="sect.gpio_switcher_devices.bt10x1">
    <title>BroadcastTools 10x1</title>
    <variablelist>
      <varlistentry>
	<term>Driver Name:</term>
	<listitem>
	  <para>
	    BroadcastTools 10x1
	  </para>
	</listitem>
      </varlistentry>
      <varlistentry>
	<term>Supported RML Commands:</term>
	<listitem>
	  <para>
	    <simplelist>
	      <member>Switch Take ['<command>ST</command>']</member>
	    </simplelist>
	  </para>
	</listitem>
      </varlistentry>
    </variablelist>
    <para>
      Control is done by means of an RS-232C connection to a four pin RJ11
      modular jack on the back of the unit (an adapter to a standard DB9
      connector is supplied by Broadcast Tools with the unit).  Serial port
      parameters should be set to 2400 baud rate, no parity, 8 data bits, 1
      stop bit, CR/LF termination.
    </para>
  </sect1>

  <sect1 xml:id="sect.gpio_switcher_devices.bt16x1">
    <title>BroadcastTools 16x1</title>
    <variablelist>
      <varlistentry>
	<term>Driver Name:</term>
	<listitem>
	  <para>
	    BroadcastTools 16x1
	  </para>
	</listitem>
      </varlistentry>
      <varlistentry>
	<term>Supported RML Commands:</term>
	<listitem>
	  <para>
	    <simplelist>
	      <member>Switch Take ['<command>ST</command>']</member>
	    </simplelist>
	  </para>
	</listitem>
      </varlistentry>
    </variablelist>
    <para>
      Control is done by means of an RS-232C connection to a four pin RJ11
      modular jack on the back of the unit (an adapter to a standard DB9
      connector is supplied by Broadcast Tools with the unit).  Serial port
      parameters should be set to 9600 baud rate, no parity, 8 data bits, 1
      stop bit, CR/LF termination.
    </para>
  </sect1>

  <sect1 xml:id="sect.gpio_switcher_devices.bt16x2">
    <title>BroadcastTools 16x2</title>
    <variablelist>
      <varlistentry>
	<term>Driver Name:</term>
	<listitem>
	  <para>
	    BroadcastTools 16x2
	  </para>
	</listitem>
      </varlistentry>
      <varlistentry>
	<term>Supported RML Commands:</term>
	<listitem>
	  <para>
	    <simplelist>
	      <member>GPO Set ['<command>GO</command>']</member>
	      <member>Switch Take ['<command>ST</command>']</member>
	    </simplelist>
	  </para>
	</listitem>
      </varlistentry>
    </variablelist>
    <para>
      Control is done by means of an RS-232C connection to a four pin RJ11
      modular jack on the back of the unit (an adapter to a standard DB9
      connector is supplied by Broadcast Tools with the unit).  Serial port
      parameters should be set to 9600 baud rate, no parity, 8 data bits, 1
      stop bit, CR/LF termination.
    </para>
    <para>
      Operation in 'multidrop' mode is not supported.
    </para>
  </sect1>

  <sect1 xml:id="sect.gpio_switcher_devices.8x2">
    <title>BroadcastTools 8x2</title>
    <variablelist>
      <varlistentry>
	<term>Driver Name:</term>
	<listitem>
	  <para>
	    BroadcastTools 8x2
	  </para>
	</listitem>
      </varlistentry>
      <varlistentry>
	<term>Supported RML Commands:</term>
	<listitem>
	  <para>
	    <simplelist>
	      <member>Switch Add ['<command>SA</command>']</member>
	      <member>Switch Remove ['<command>SR</command>']</member>
	      <member>Switch Take ['<command>ST</command>']</member>
	    </simplelist>
	  </para>
	</listitem>
      </varlistentry>
    </variablelist>
    <para>
      Control is done by means of an RS-232C connection to a four pin RJ11
      modular jack on the back of the unit (an adapter to a standard DB9
      connector is supplied by Broadcast Tools with the unit).  Serial port
      parameters should be set to 2400 baud rate, no parity, 8 data bits, 1
      stop bit, CR/LF termination.
    </para>
    <para>
      The 8x2 should be configured to use 'Mix' mode.  This can be done
      by holding down the F1 button on the switcher while powering up.
    </para>
    <para>
      Operation in 'multidrop' mode is not supported.
    </para>
  </sect1>

  <sect1 xml:id="sect.gpio_switcher_devices.btacs82">
    <title>BroadcastTools ACS8.2</title>
    <variablelist>
      <varlistentry>
	<term>Driver Name:</term>
	<listitem>
	  <para>
	    BroadcastTools ACS8.2
	  </para>
	</listitem>
      </varlistentry>
      <varlistentry>
	<term>Supported RML Commands:</term>
	<listitem>
	  <para>
	    <simplelist>
	      <member>GPI Enable ['<command>GE</command>']</member>
	      <member>GPI Set ['<command>GI</command>']</member>
	      <member>GPO Set ['<command>GO</command>']</member>
	      <member>Switch Add ['<command>SA</command>']</member>
	      <member>Switch Level ['<command>SL</command>']
	      [output #1 only]</member>
	      <member>Switch Remove ['<command>SR</command>']</member>
	      <member>Switch Take ['<command>ST</command>']</member>
	    </simplelist>
	  </para>
	</listitem>
      </varlistentry>
    </variablelist>
    <para>
      Control is done by means of an RS-232C connection to a four pin RJ11
      modular jack on the back of the unit (an adapter to a standard DB9
      connector is supplied by Broadcast Tools with the unit).  Serial port
      speed on the ACS 8.2 should be set to 9600.  Serial port parameters 
      should be set to 9600 baud rate, no parity, 8 data bits, 1 stop bit, 
      no termination.
    </para>
    <para>
      The ACS 8.2 should be configured to use 'Mix' mode --i.e. DIP switches
      SW17-5 and SW17-6 should both be 'on', and the unit ID should be
      '0', with DIP switches SW17-1 and SW17-2 both 'off'.
    </para>
    <para>
      Operation in 'multidrop' mode is not supported.  If you wish to use
      GPI (referred to as 'PIP', for 'Parallel Input Port' in the Broadcast 
      Tools documentation), then you will also need to be sure that DIP
      switch SW17-10 is ON.
    </para>
    <para>
      The ACS 8.2 supports the Switch Level [SL] RML for connections to
      Output 1.  Six different gain levels are supported:  0 dB, -3 dB, 
      -6 dB, -10 dB, -15 dB and -20 dB.  For for a specified gain level of
      greater than or equal to -20, the applied gain will be rounded down 
      to the next supported level.  For gain levels of less than -20 dB, the
      minimum supported gain (-20 dB) will be applied.
    </para>
  </sect1>

  <sect1 xml:id="sect.gpio_switcher_devices.btadms4422">
    <title>BroadcastTools ADMS 44.22 Analog/AES Digital Matrix Switcher</title>
    <variablelist>
      <varlistentry>
	<term>Driver Name:</term>
	<listitem>
	  <para>
	    BroadcastTools ADMS 44.22
	  </para>
	</listitem>
      </varlistentry>
      <varlistentry>
	<term>Supported RML Commands:</term>
	<listitem>
	  <para>
	    <simplelist>
	      <member>GPI Enable ['<command>GE</command>']</member>
	      <member>GPI Set ['<command>GI</command>']</member>
	      <member>GPO Set ['<command>GO</command>']</member>
	      <member>Switch Add ['<command>SA</command>']</member>
	      <member>Switch Level ['<command>SL</command>']</member>
	      <member>Switch Remove ['<command>SR</command>']</member>
	      <member>Switch Take ['<command>ST</command>']</member>
	    </simplelist>
	  </para>
	</listitem>
      </varlistentry>
    </variablelist>
    <para>
      Control is done by means of a serial connection to the unit's integrated
      serial port.  The 'OPTIONS' switches on the back of the unit should
      be set as follows:
    </para>
    <simplelist>
      <member>1: OFF (UP)</member>
      <member>2: OFF (UP)</member>
      <member>3: OFF (UP)</member>
      <member>4: OFF (UP)</member>
      <member>5: OFF (UP)</member>
      <member>6: OFF (UP)</member>
      <member>7: ON  (DOWN)</member>
      <member>8: ON  (DOWN)</member>
      <member>9: OFF (UP)</member>
      <member>10: OFF (UP)</member>
    </simplelist>
    <para>
      The Rivendell serial interface should be set to use 9600 bits/sec,
      8 bits, 1 stop bit and no flow control.
    </para>
  </sect1>

  <sect1 xml:id="sect.gpio_switcher_devices.btgpi16">
    <title>BroadcastTools GPI-16 General Purpose Input Module</title>
    <variablelist>
      <varlistentry>
	<term>Driver Name:</term>
	<listitem>
	  <para>
	    BroadcastTools GPI-16
	  </para>
	</listitem>
      </varlistentry>
      <varlistentry>
	<term>Supported RML Commands:</term>
	<listitem>
	  <para>
	    <simplelist>
	      <member>GPI Enable ['<command>GE</command>']</member>
	      <member>GPI Set ['<command>GI</command>']</member>
	    </simplelist>
	  </para>
	</listitem>
      </varlistentry>
    </variablelist>
    <para>
      Control is done by means of a serial connection to the unit's
      integrated serial port.  There is also a 'plus' version that
      features an integrated type B USB interface that simulates a serial
      port.
    </para>
    <para>
      The unit should work correctly with factory default settings.
      The Rivendell serial interface should be set to use 9600 bits/sec,
      8 bits, 1 stop bit and no flow control.
    </para>
  </sect1>

  <sect1 xml:id="sect.gpio_switcher_devices.btsentinel4web">
    <title>BroadcastTools Sentinel 4 Web AES Switcher</title>
    <variablelist>
      <varlistentry>
	<term>Driver Name:</term>
	<listitem>
	  <para>
	    BroadcastTools Sentinel 4 Web
	  </para>
	</listitem>
      </varlistentry>
      <varlistentry>
	<term>Supported RML Commands:</term>
	<listitem>
	  <para>
	    <simplelist>
	      <member>Switch Take ['<command>ST</command>']</member>
	    </simplelist>
	  </para>
	</listitem>
      </varlistentry>
    </variablelist>
    <para>
      Control is done by means of a TCP/IP connection to the unit's
      integrated Ethernet port.
    </para>
    <para>
      On the <computeroutput>Email/Network Setup</computeroutput>
      page of the unit, be sure that the
      <computeroutput>TCP Enabled</computeroutput> box is checked and
      that <computeroutput>TCP Listen Port</computeroutput> is set to
      the same number as is used in the
      <computeroutput>IP Port</computeroutput> setting in Rivendell's
      driver configuration (<userinput>56</userinput> by default).
    </para>
  </sect1>

  <sect1 xml:id="sect.gpio_switcher_devices.btsrc16">
    <title>BroadcastTools SRC-16</title>
    <variablelist>
      <varlistentry>
	<term>Driver Name:</term>
	<listitem>
	  <para>
	    BroadcastTools SRC-16
	  </para>
	</listitem>
      </varlistentry>
      <varlistentry>
	<term>Supported RML Commands:</term>
	<listitem>
	  <para>
	    <simplelist>
	      <member>GPI Enable ['<command>GE</command>']</member>
	      <member>GPI Set ['<command>GI</command>']</member>
	    </simplelist>
	  </para>
	</listitem>
      </varlistentry>
    </variablelist>
    <para>
      Control is done by means of a serial connection to the unit's integrated
      serial port.
    </para>
    <para>
      The unit should work correctly with factory default settings.
      The Rivendell serial interface should be set to use 9600 bits/sec,
      8 bits, 1 stop bit and no flow control.
    </para>
  </sect1>

  <sect1 xml:id="sect.gpio_switcher_devices.btss124">
    <title>BroadcastTools SS 12.4</title>
    <variablelist>
      <varlistentry>
	<term>Driver Name:</term>
	<listitem>
	  <para>
	    BroadcastTools SS 12.4
	  </para>
	</listitem>
      </varlistentry>
      <varlistentry>
	<term>Supported RML Commands:</term>
	<listitem>
	  <para>
	    <simplelist>
	      <member>Switch Add ['<command>SA</command>']</member>
	      <member>Switch Remove ['<command>SR</command>']</member>
	      <member>Switch Take ['<command>ST</command>']</member>
	    </simplelist>
	  </para>
	</listitem>
      </varlistentry>
    </variablelist>
    <para>
      Control is done by means of an RS-232C connection to a four pin RJ11
      modular jack on the back of the unit (an adapter to a standard DB9
      connector is supplied by Broadcast Tools with the unit).  Serial port
      parameters should be set to 9600 baud rate, no parity, 8 data bits, 1
      stop bit, CR/LF termination.
    </para>
    <para>
      The SS 12.4 should be configured to use 'Mix' mode.  This can be done 
      by setting DIP switches SW1-7 and SW-1-3 to OFF.
    </para>
    <para>
      Operation in 'multidrop' mode is not supported.
    </para>
  </sect1>

  <sect1 xml:id="sect.gpio_switcher_devices.btss21">
    <title>BroadcastTools SS 2.1</title>
    <variablelist>
      <varlistentry>
	<term>Driver Name:</term>
	<listitem>
	  <para>
	    BroadcastTools SS 2.1
	  </para>
	</listitem>
      </varlistentry>
      <varlistentry>
	<term>Supported RML Commands:</term>
	<listitem>
	  <para>
	    <simplelist>
	      <member>Switch Take ['<command>ST</command>']</member>
	    </simplelist>
	  </para>
	</listitem>
      </varlistentry>
    </variablelist>
    <para>
      Control is done by means of an RS-232C connection to a four pin RJ11
      modular jack on the back of the unit (an adapter to a standard DB9
      connector is supplied by Broadcast Tools with the unit).  Serial port
      parameters should be set to 9600 baud rate, no parity, 8 data bits, 1
      stop bit, CR/LF termination.
    </para>
    <para>
      Operation in 'multidrop' mode is not supported.
    </para>
  </sect1>

  <sect1 xml:id="sect.gpio_switcher_devices.btss164">
    <title>BroadcastTools SS 16.4</title>
    <variablelist>
      <varlistentry>
	<term>Driver Name:</term>
	<listitem>
	  <para>
	    BroadcastTools SS 16.4
	  </para>
	</listitem>
      </varlistentry>
      <varlistentry>
	<term>Supported RML Commands:</term>
	<listitem>
	  <para>
	    <simplelist>
	      <member>GPI Enable ['<command>GE</command>']</member>
	      <member>GPI Set ['<command>GI</command>']</member>
	      <member>GPO Set ['<command>GO</command>']</member>
	      <member>Switch Add ['<command>SA</command>']</member>
	      <member>Switch Remove ['<command>SR</command>']</member>
	      <member>Switch Take ['<command>ST</command>']</member>
	    </simplelist>
	  </para>
	</listitem>
      </varlistentry>
    </variablelist>
    <para>
      Control is done by means of an RS-232C connection to a four pin RJ11
      modular jack on the back of the unit (an adapter to a standard DB9
      connector is supplied by Broadcast Tools with the unit).  Serial port
      parameters should be set to 9600 baud rate, no parity, 8 data bits, 1
      stop bit, CR/LF termination.
    </para>
    <para>
      A total of 24 GPO outputs are supported, with the relays appearing as
      GPO lines 1-8 and the open collector outputs as lines 9-24.  All 24
      'PIP' inputs are supported as GPI devices.
    </para>
    <para>
      The SS 16.4 should be configured to use 'Mix' mode and to have 'PIP'
      mode enabled.  This can be done by setting DIP switches SW24-5, SW24-6 
      and SW24-8 to ON.
    </para>
    <para>
      Operation in 'multidrop' mode is not supported.
    </para>
  </sect1>

  <sect1 xml:id="sect.gpio_switcher_devices.btss41mlr">
    <title>BroadcastTools SS 4.1 MLR Switcher/Router</title>
    <variablelist>
      <varlistentry>
	<term>Driver Name:</term>
	<listitem>
	  <para>
	    BroadcastTools SS4.1 MLR
	  </para>
	</listitem>
      </varlistentry>
      <varlistentry>
	<term>Supported RML Commands:</term>
	<listitem>
	  <para>
	    <simplelist>
	      <member>GPI Enable ['<command>GE</command>']</member>
	      <member>GPI Set ['<command>GI</command>']</member>
	      <member>Switch Take ['<command>ST</command>']</member>
	    </simplelist>
	  </para>
	</listitem>
      </varlistentry>
    </variablelist>
    <para>
      Control is done by means of an RS-232C connection to a four pin RJ11
      modular jack on the back of the unit (an adapter to a standard DB9
      connector is supplied by Broadcast Tools with the unit).  Serial port
      speed on the SS 4.1 should be set to 9600 (DIP switches SW6-4 and
      SW6-5 set to 'off').  Serial port parameters in RDAdmin should be set
      to 9600 baud rate, no parity, 8 data bits, 1 stop bit, CR/LF
      termination.
    </para>
    <para>
      The SS 4.1 should be configured to use unit ID '0', with DIP switches
      SW6-1, SW6-2 and SW6-3 all set to 'off'.
    </para>
    <para>
      Operation in 'multidrop' mode is not supported.  If you wish to use
      GPI (referred to as 'PIP', for 'Parallel Input Port' in the Broadcast 
      Tools documentation), then you will also need to be sure that DIP
      switch SW6-7 is ON.
    </para>
  </sect1>

  <sect1 xml:id="sect.gpio_switcher_devices.btss42">
    <title>BroadcastTools SS4.2</title>
    <variablelist>
      <varlistentry>
	<term>Driver Name:</term>
	<listitem>
	  <para>
	    BroadcastTools SS4.2
	  </para>
	</listitem>
      </varlistentry>
      <varlistentry>
	<term>Supported RML Commands:</term>
	<listitem>
	  <para>
	    <simplelist>
	      <member>GPI Enable ['<command>GE</command>']</member>
	      <member>GPI Set ['<command>GI</command>']</member>
	      <member>GPO Set ['<command>GO</command>']</member>
	      <member>Switch Add ['<command>SA</command>']</member>
	      <member>Switch Remove ['<command>SR</command>']</member>
	      <member>Switch Take ['<command>ST</command>']</member>
	    </simplelist>
	  </para>
	</listitem>
      </varlistentry>
    </variablelist>
    <para>
      Control is done by means of an RS-232C connection to a four pin RJ11
      modular jack on the back of the unit (an adapter to a standard DB9
      connector is supplied by Broadcast Tools with the unit).  Serial port
      speed on the SS 4.2 should be set to 9600 (DIP switches SW13-3 and
      SW13-4 set to 'off').  Serial port parameters in RDAdmin should be set
      to 9600 baud rate, no parity, 8 data bits, 1 stop bit, CR/LF
      termination.
    </para>
    <para>
      The SS 4.2 should be configured to use 'Mix' mode --i.e. DIP switches
      SW13-5 and SW13-6 should both be 'on', and the unit ID should be set to
      '0', with DIP switches SW13-1 and SW13-2 both 'off'.
    </para>
    <para>
      Operation in 'multidrop' mode is not supported.  If you wish to use
      GPI (referred to as 'PIP', for 'Parallel Input Port' in the Broadcast 
      Tools documentation), then you will also need to be sure that DIP
      switch SW13-7 is ON.
    </para>
  </sect1>

  <sect1 xml:id="sect.gpio_switcher_devices.btss44">
    <title>BroadcastTools SS4.4</title>
    <variablelist>
      <varlistentry>
	<term>Driver Name:</term>
	<listitem>
	  <para>
	    BroadcastTools SS4.4
	  </para>
	</listitem>
      </varlistentry>
      <varlistentry>
	<term>Supported RML Commands:</term>
	<listitem>
	  <para>
	    <simplelist>
	      <member>GPI Enable ['<command>GE</command>']</member>
	      <member>GPI Set ['<command>GI</command>']</member>
	      <member>GPO Set ['<command>GO</command>']</member>
	      <member>Switch Add ['<command>SA</command>']</member>
	      <member>Switch Remove ['<command>SR</command>']</member>
	      <member>Switch Take ['<command>ST</command>']</member>
	    </simplelist>
	  </para>
	</listitem>
      </varlistentry>
    </variablelist>
    <para>
      Control is done by means of an RS-232C connection to a four pin RJ11
      modular jack on the back of the unit (an adapter to a standard DB9
      connector is supplied by Broadcast Tools with the unit).  Serial port
      speed on the SS 4.4 should be set to 9600 (DIP switch SW3 set to 'off').
      Serial port parameters in RDAdmin should be set to 9600 baud rate,
      no parity, 8 data bits, 1 stop bit, CR/LF termination.
    </para>
    <para>
      The SS 4.4 should be configured to use 'Mix' mode --i.e. DIP switches
      SW4 and SW5 should both be 'on', and the unit ID should be set to
      '0', with DIP switches SW1 and SW2 both 'off'.
    </para>
    <para>
      Operation in 'multidrop' mode is not supported.  If you wish to use
      GPI (referred to as 'PIP', for 'Parallel Input Port' in the Broadcast 
      Tools documentation), then you will also need to be sure that DIP
      switch SW8 is 'on'.  If you wish to use the open collector and relay
      outputs as GPO, then you will also need to be sure that DIP switch
      SW6 is 'off'.
    </para>
  </sect1>

  <sect1 xml:id="sect.gpio_switcher_devices.btss82">
    <title>BroadcastTools SS8.2</title>
    <variablelist>
      <varlistentry>
	<term>Driver Name:</term>
	<listitem>
	  <para>
	    BroadcastTools SS8.2
	  </para>
	</listitem>
      </varlistentry>
      <varlistentry>
	<term>Supported RML Commands:</term>
	<listitem>
	  <para>
	    <simplelist>
	      <member>GPI Enable ['<command>GE</command>']</member>
	      <member>GPI Set ['<command>GI</command>']</member>
	      <member>GPO Set ['<command>GO</command>']</member>
	      <member>Switch Add ['<command>SA</command>']</member>
	      <member>Switch Remove ['<command>SR</command>']</member>
	      <member>Switch Take ['<command>ST</command>']</member>
	    </simplelist>
	  </para>
	</listitem>
      </varlistentry>
    </variablelist>
    <para>
      Control is done by means of an RS-232C connection to a four pin RJ11
      modular jack on the back of the unit (an adapter to a standard DB9
      connector is supplied by Broadcast Tools with the unit).  Serial port
      speed on the SS 8.2 should be set to 19200 (some have found 9600 to work
      instead).  Do *not* use 38400, as there are known bugs within the SS 8.2
      when used with this speed!  Serial port parameters should be set to
      19200 baud rate (or 9600 if that worked instead), No parity, 8 data
      bits, 1 stop bit, CR/LF termination (or potentially no termination).
    </para>
    <para>
      The SS 8.2 should be configured to use 'Mix' mode --i.e. DIP switches
      SW-14-4 and SW-14-5 should both be 'on', and the unit ID should be
      '0', with DIP switches SW-14-1, SW-14-2 and SW-14-3 all 'off'.
    </para>
    <para>
      Operation in 'multidrop' mode is not supported.  If you wish to use
      GPI (referred to as 'PIP', for 'Parallel Input Port' in the Broadcast 
      Tools documentation), then you will also need to be sure that DIP
      switch SW-14-10 is ON.
    </para>
  </sect1>

  <sect1 xml:id="sect.gpio_switcher_devices.btu41mlrweb">
    <title>BroadcastTools Universal 4.1MLR>>Web</title>
    <variablelist>
      <varlistentry>
	<term>Driver Name:</term>
	<listitem>
	  <para>
	    BroadcastTools 4.1 MLR>>Web
	  </para>
	</listitem>
      </varlistentry>
      <varlistentry>
	<term>Supported RML Commands:</term>
	<listitem>
	  <para>
	    <simplelist>
	      <member>GPI Enable ['<command>GE</command>']</member>
	      <member>GPI Set ['<command>GI</command>']</member>
	      <member>Switch Take ['<command>ST</command>']</member>
	    </simplelist>
	  </para>
	</listitem>
      </varlistentry>
    </variablelist>
    <para>
      Control is by means of a TCP/IP connection to port 5002.
    </para>
  </sect1>

  <sect1 xml:id="sect.gpio_switcher_devices.harlond">
    <title>Harlond Virtual Mixer</title>
    <variablelist>
      <varlistentry>
	<term>Driver Name:</term>
	<listitem>
	  <para>
	    Harlond Virtual Mixer
	  </para>
	</listitem>
      </varlistentry>
      <varlistentry>
	<term>Supported RML Commands:</term>
	<listitem>
	  <para>
	    <simplelist>
	      <member>Fire Salvo ['<command>FS</command>']</member>
	      <member>GPI Enable ['<command>GE</command>']</member>
	      <member>GPI Set ['<command>GI</command>']</member>
	      <member>GPO Set ['<command>GO</command>']</member>
	      <member>Switch Add ['<command>SA</command>']</member>
	      <member>Switch Level ['<command>SL</command>']</member>
	      <member>Switch Remove ['<command>SR</command>']</member>
	      <member>Switch Take ['<command>ST</command>']</member>
	    </simplelist>
	  </para>
	</listitem>
      </varlistentry>
    </variablelist>
    <para>
      Control is by means of a TCP/IP connection to port 5002. Output
      busses are mapped as follows:
    </para>
    <table frame="all">
      <title>Harlond Output Buss Mappings</title>
      <tgroup cols="2" align="left" colsep="1" rowsep="1">
	<colspec colname="Output" />
	<colspec colname="Buss" />
	<thead>
	  <row><entry>Output</entry><entry>Buss</entry></row>
	</thead>
	<tbody>
	  <row><entry>1</entry><entry>PGM</entry></row>
	  <row><entry>2</entry><entry>AUD</entry></row>
	  <row><entry>3</entry><entry>UTL</entry></row>
	  <row><entry>4</entry><entry>CUE</entry></row>
	</tbody>
      </tgroup>
    </table>
    <para>
      Input channel ON/OFF is sensed/controlled by means of the
      respective GPIO number using GE/GI/GO RMLs.
    </para>
  </sect1>

  <sect1 xml:id="sect.gpio_switcher_devices.kernelgpio">
    <title>Kernel GPIO</title>
    <variablelist>
      <varlistentry>
	<term>Driver Name:</term>
	<listitem>
	  <para>
	    Kernel GPIO
	  </para>
	</listitem>
      </varlistentry>
      <varlistentry>
	<term>Supported RML Commands:</term>
	<listitem>
	  <para>
	    <simplelist>
	      <member>GPI Enable ['<command>GE</command>']</member>
	      <member>GPI Set ['<command>GI</command>']</member>
	      <member>GPO Set ['<command>GO</command>']</member>
	    </simplelist>
	  </para>
	</listitem>
      </varlistentry>
    </variablelist>
    <para>
      This driver can be used to control kernel-based GPIO interfaces,
      such as	the GPIO pins on a Raspberry Pi. Pins are allocated such that
      inputs come first, followed by outputs.
    </para>
    <para>
      Further information on kernel GPIO devices can be found at
      https://www.kernel.org/doc/Documentation/gpio/sysfs.txt
    </para>
  </sect1>

  <sect1 xml:id="sect.gpio_switcher_devices.livewire_lwrpaudio">
    <title>Livewire LWRP Audio</title>
    <variablelist>
      <varlistentry>
	<term>Driver Name:</term>
	<listitem>
	  <para>
	    Livewire LWRP Audio
	  </para>
	</listitem>
      </varlistentry>
      <varlistentry>
	<term>Supported RML Commands:</term>
	<listitem>
	  <para>
	    <simplelist>
	      <member>Switch Take ['<command>ST</command>']</member>
	    </simplelist>
	  </para>
	</listitem>
      </varlistentry>
    </variablelist>
    <para>
      Livewire is a distributed audio router and control system, with the 
      components (called 'nodes') configured and controled via TCP/IP.  More
      information can be found at http://www.axiaaudio.com/.
    </para>
    <para>
      This driver can be used to create and remove connections between audio
      sources and destinations via Livewire Routing Protocol (LWRP).
    </para>
    <para>
      Configuration is a matter of entering the IP address, password and base
      output number for each node in 
      <code>RDAdmin->ManageHosts->Switcher/GPIO->LivewireNodes</code>.
      The driver
      will autodetect all other parameters from the nodes themselves.  The
      resulting constellation of nodes can be controled with the
      'Switch Take' ['<command>ST</command>'] RML by specifying the
      Livewire source stream number as the <replaceable>input</replaceable>
      parameter and the the base output number+the slot number-1 for the
      <replaceable>output</replaceable> parameter.
    </para>
  </sect1>

  <sect1 xml:id="sect.gpio_switcher_devices.livewire_lwrpgpio">
    <title>Livewire LWRP GPIO</title>
    <variablelist>
      <varlistentry>
	<term>Driver Name:</term>
	<listitem>
	  <para>
	    Livewire LWRP GPIO
	  </para>
	</listitem>
      </varlistentry>
      <varlistentry>
	<term>Supported RML Commands:</term>
	<listitem>
	  <para>
	    <simplelist>
	      <member>GPI Enable ['<command>GE</command>']</member>
	      <member>GPI Set ['<command>GI</command>']</member>
	      <member>GPO Set ['<command>GO</command>']</member>
	    </simplelist>
	  </para>
	</listitem>
      </varlistentry>
    </variablelist>
    <para>
      Livewire is a distributed audio router and control system, with the 
      components (called 'nodes') configured and controled via TCP/IP.  More
      information can be found at http://www.axiaaudio.com/.
    </para>
    <para>
      This driver can be used to control Livewire's GPIO subsystem by means of
      the Livewire Routing Protocol (LWRP) with both physical as well as
      'virtual' GPIO devices.
    </para>
    <para>
      Only two items need to be specified in the configuration: the
      <computeroutput>IP address</computeroutput>
      of the device to control and the
      <computeroutput>'Layer</computeroutput>, with
      <userinput>V</userinput> specifying a virtual
      GPIO device and <userinput>D</userinput> specifying an actual
      physical one.  The driver
      will autodetect all other parameters (e.g. the number of input and
      output lines) from the device itself.
    </para>
  </sect1>

  <sect1 xml:id="sect.gpio_switcher_devices.livewire_mcastgpio">
    <title>Livewire Multicast GPIO</title>
    <variablelist>
      <varlistentry>
	<term>Driver Name:</term>
	<listitem>
	  <para>
	    Livewire Multicast GPIO
	  </para>
	</listitem>
      </varlistentry>
      <varlistentry>
	<term>Supported RML Commands:</term>
	<listitem>
	  <para>
	    <simplelist>
	      <member>GPI Enable ['<command>GE</command>']</member>
	      <member>GPI Set ['<command>GI</command>']</member>
	      <member>GPO Set ['<command>GO</command>']</member>
	    </simplelist>
	  </para>
	</listitem>
      </varlistentry>
    </variablelist>
    <para>
      Livewire is a distributed audio router and control system, with the 
      components (called 'nodes') configured and controled via TCP/IP.  More
      information can be found at http://www.axiaaudio.com/.
    </para>
    <para>
      This driver provides the ability to access GPIO functions from Livewire-
      enabled control surfaces for setups that lack a virtual GPIO device
      --e.g. when interfacing audio directly to a Livewire node without
      using a native Livewire software audio driver or audio adapter.
    </para>
    <para>
      When configuring it, the <computeroutput>IP Address</computeroutput>
      field should contain the address
      of the local interface to which the Livewire network is attached, while
      the <computeroutput>Livewire GPIOs</computeroutput> list should be
      populated with the stream
      number - GPIO line associations to be used.
    </para>
  </sect1>

  <sect1 xml:id="sect.gpio_switcher_devices.local_audio">
    <title>Local Audio Adapter</title>
    <variablelist>
      <varlistentry>
	<term>Driver Name:</term>
	<listitem>
	  <para>
	    Local Audio Adapter
	  </para>
	</listitem>
      </varlistentry>
      <varlistentry>
	<term>Supported RML Commands:</term>
	<listitem>
	  <para>
	    <simplelist>
	      <member>GPI Enable ['<command>GE</command>']</member>
	      <member>GPI Set ['<command>GI</command>']</member>
	      <member>GPO Set ['<command>GO</command>']</member>
	      <member>Switch Add ['<command>SA</command>']</member>
	      <member>Switch Add With Gain ['<command>SX</command>']</member>
	      <member>Switch Remove ['<command>SR</command>']</member>
	      <member>Switch Take ['<command>ST</command>']</member>
	    </simplelist>
	  </para>
	</listitem>
      </varlistentry>
    </variablelist>
    <para>
      It's possible to use one or more of the actual audio adapters as a
      switcher device using this driver.  Doing so makes it possible to
      route audio directly from the adapter inputs to outputs, while at the
      same time using it for audio capture/playout in the usual manner.
    </para>
    <para>
      To configure it, set <computeroutput>Card:</computeroutput> to the
      number of the audio adapter to use and the
      <computeroutput>Inputs:</computeroutput> and
      <computeroutput>Outputs:</computeroutput> fields to the
      number of inputs and outputs on the card (as found in
      <code>RDADmin->ManageHosts->AudioResources</code>).
    </para>
    <para>
      For AudioScience cards that include onboard GPIO (such as the
      ASI67xx series), the GPIO resources on the card will also be
      available via the this driver.
    </para>
  </sect1>

  <sect1 xml:id="sect.gpio_switcher_devices.local_gpio">
    <title>Local GPIO</title>
    <variablelist>
      <varlistentry>
	<term>Driver Name:</term>
	<listitem>
	  <para>
	    Local GPIO
	  </para>
	</listitem>
      </varlistentry>
      <varlistentry>
	<term>Supported RML Commands:</term>
	<listitem>
	  <para>
	    <simplelist>
	      <member>GPI Enable ['<command>GE</command>']</member>
	      <member>GPI Set ['<command>GI</command>']</member>
	      <member>GPO Set ['<command>GO</command>']</member>
	    </simplelist>
	  </para>
	</listitem>
      </varlistentry>
    </variablelist>
    <para>
      This driver supports a variety of GPIO devices, including:
      <simplelist>
	<member>15 Pin Joystick Port</member>
	<member>USB HID Devices</member>
	<member>MeasurementComputing GPIO Cards</member>
      </simplelist>
    </para>
    <sect2 xml:id="sect.gpio_switcher_devices.joysticks">
      <title>15 Pin Joystick Port</title>
      <para>
	Joystick support utilizes the Linux Input Device subsystem.  Inputs
	are active-low, and should be wired as follows:
      </para>
      <table frame="none">
	<title>15 Pin Joystick Port Wiring</title>
	<tgroup cols="2" align="left" colsep="0" rowsep="0">
	  <colspec colname="Pin" colwidth="1.0*"/>
	  <colspec colname="Signal" colwidth="20.0*"/>
	  <thead>
	    <row><entry>Pin</entry><entry>Signal</entry></row>
	  </thead>
	  <tbody>
	    <row><entry>2</entry><entry>Input 1</entry></row>
	    <row><entry>4</entry><entry>Ground</entry></row>
	    <row><entry></entry><entry></entry></row>
	    <row><entry>7</entry><entry>Input 2</entry></row>
	    <row><entry>5</entry><entry>Ground</entry></row>
	    <row><entry></entry><entry></entry></row>
	    <row><entry>10</entry><entry>Input 3</entry></row>
	    <row><entry>12</entry><entry>Ground</entry></row>
	    <row><entry></entry><entry></entry></row>
	    <row><entry>14</entry><entry>Input 4</entry></row>
	    <row><entry>12</entry><entry>Ground</entry></row>
	  </tbody>
	</tgroup>
      </table>
      <para>
	In addition, you will need to connect 47 kohm resistors between the
	following pins:  1-3, 6-8, 9-11 and 13-15.  While not strictly needed
	for the GPI portion of the interface to work, the kernel's analog
	joystick driver will refuse to initialize the port if these resistors
	(or a real joystick) are not present.
      </para>
      <para>
	The device name of the joystick will be one of the
	<userinput>/dev/input/event<replaceable>n</replaceable></userinput>
	devices.
      </para>
      <para>
	NOTE: There have been reports that some port models do not internally 
	connect pin 12 to ground.  The symptom of this situation will be that
	Inputs 1 and 2 work, but not Inputs 3 and 4.  If this is the case, 
	connecting the ground for Inputs 3 and 4 to pins 04 or 05 should remedy
	the problem.
	</para>
      </sect2>
      <sect2 xml:id="sect.gpio_switcher_devices.measurementcomputing">
	<title>MeasurementComputing GPIO Cards</title>
	<para>
	  The following MeasurementComputing cards are supported:
	</para>
	<simplelist>
	  <member><link endlink="sect.gpio_switcher_devices.measurementcomputing.pci_pdis08_and_pci_pdis16">PCI-PDIS08</link></member>
	  <member><link endlink="sect.gpio_switcher_devices.measurementcomputing.pci_pdis08_and_pci_pdis16">PCI-PDIS16</link></member>
	  <member><link endlink="sect.gpio_switcher_devices.measurementcomputing.pci_dio24">PCI-DIO24</link></member>
	</simplelist>
	<para>
	  The device name for the card should be 
	  <userinput>/dev/gpio<replaceable>n</replaceable></userinput>.
	</para>
	<sect3 xml:id="sect.gpio_switcher_devices.measurementcomputing.pci_pdis08_and_pci_pdis16">
	  <title>PCI-PDIS08 and PCI-PDIS16</title>
	  <para>
	    The Measurement Computing PCI-PDIS08 and PCI-PDIS16 boards
	    feature floating, opto-isolated inputs. The inputs are
	    not polarity sensitive and may be driven by either AC or
	    DC. The outputs are electro-mechanical relays with dry
	    contacts.
	  </para>
	  <table frame="none">
	    <title>PCI-PDIS08 and PCI-PDIS16 Connector Pinout (DB37F)</title>
	    <tgroup cols="2" align="left" colsep="0" rowsep="0">
	      <colspec colname="Pin" colwidth="1.0*"/>
	      <colspec colname="Signal" colwidth="20.0*"/>
	      <thead>
		<row><entry>Pin</entry><entry>Signal</entry></row>
	      </thead>
	      <tbody>
		<row><entry>1</entry><entry>Input 8/16</entry></row>
		<row><entry>20</entry><entry>Input 8/16</entry></row>
		<row><entry></entry><entry></entry></row>
		<row><entry>2</entry><entry>Input 7/15</entry></row>
		<row><entry>21</entry><entry>Input 7/15</entry></row>
		<row><entry></entry><entry></entry></row>
		<row><entry>3</entry><entry>Input 6/14</entry></row>
		<row><entry>22</entry><entry>Input 6/14</entry></row>
		<row><entry></entry><entry></entry></row>
		<row><entry>4</entry><entry>Input 5/13</entry></row>
		<row><entry>23</entry><entry>Input 5/13</entry></row>
		<row><entry></entry><entry></entry></row>
		<row><entry>5</entry><entry>Input 4/12</entry></row>
		<row><entry>24</entry><entry>Input 4/12</entry></row>
		<row><entry></entry><entry></entry></row>
		<row><entry>6</entry><entry>Input 3/11</entry></row>
		<row><entry>25</entry><entry>Input 3/11</entry></row>
		<row><entry></entry><entry></entry></row>
		<row><entry>7</entry><entry>Input 2/10</entry></row>
		<row><entry>26</entry><entry>Input 2/10</entry></row>
		<row><entry></entry><entry></entry></row>
		<row><entry>8</entry><entry>Input 1/9</entry></row>
		<row><entry>27</entry><entry>Input 1/9</entry></row>
		<row><entry></entry><entry></entry></row>
		<row><entry>9</entry><entry>Output 8/16 C</entry></row>
		<row><entry>28</entry><entry>Output 8/16 N/O</entry></row>
		<row><entry></entry><entry></entry></row>
		<row><entry>10</entry><entry>Output 7/15 C</entry></row>
		<row><entry>29</entry><entry>Output 7/15 N/O</entry></row>
		<row><entry></entry><entry></entry></row>
		<row><entry>11</entry><entry>Output 6/14 C</entry></row>
		<row><entry>30</entry><entry>Output 6/14 N/O</entry></row>
		<row><entry></entry><entry></entry></row>
		<row><entry>12</entry><entry>Output 5/13 N/C</entry></row>
		<row><entry>13</entry><entry>Output 5/13 N/O</entry></row>
		<row><entry>31</entry><entry>Output 5/13 C</entry></row>
		<row><entry></entry><entry></entry></row>
		<row><entry>14</entry><entry>Output 4/12 N/C</entry></row>
		<row><entry>32</entry><entry>Output 4/12 N/O</entry></row>
		<row><entry>33</entry><entry>Output 4/12 C</entry></row>
		<row><entry></entry><entry></entry></row>
		<row><entry>15</entry><entry>Output 3/11 N/C</entry></row>
		<row><entry>16</entry><entry>Output 3/11 N/O</entry></row>
		<row><entry>34</entry><entry>Output 3/11 C</entry></row>
		<row><entry></entry><entry></entry></row>
		<row><entry>17</entry><entry>Output 2/10 N/C</entry></row>
		<row><entry>35</entry><entry>Output 2/10 N/O</entry></row>
		<row><entry>36</entry><entry>Output 2/10 C</entry></row>
		<row><entry></entry><entry></entry></row>
		<row><entry>18</entry><entry>Output 1/9 N/C</entry></row>
		<row><entry>19</entry><entry>Output 1/9 N/O</entry></row>
		<row><entry>37</entry><entry>Output 1/9 C</entry></row>
	      </tbody>
	    </tgroup>
	  </table>
	</sect3>
	<sect3 xml:id="sect.gpio_switcher_devices.measurementcomputing.pci_dio24">
	  <title>PCI-DIO24</title>
	  <para>
	    The Measurement Computing PCI-DIO24 board features 24
	    bi-directional, TTL level signal lines, referenced to a
	    common ground. The driver can be
	    configured to use all of the lines as inputs or outputs
	    (mixing inputs and outputs on the same board is not supported).
	    When used as inputs, termination resistor packs should be
	    installed.
	  </para>
	  <table frame="none">
	    <title>PCI-DIO24 Connector Pinout (DB37F)</title>
	    <tgroup cols="2" align="left" colsep="0" rowsep="0">
	      <colspec colname="Pin" colwidth="1.0*"/>
	      <colspec colname="Signal" colwidth="20.0*"/>
	      <thead>
		<row><entry>Pin</entry><entry>Signal</entry></row>
	      </thead>
	      <tbody>
		<row><entry>37</entry><entry>Input 1</entry></row>
		<row><entry>36</entry><entry>Input 2</entry></row>
		<row><entry>35</entry><entry>Input 3</entry></row>
		<row><entry>34</entry><entry>Input 4</entry></row>
		<row><entry>33</entry><entry>Input 5</entry></row>
		<row><entry>32</entry><entry>Input 6</entry></row>
		<row><entry>31</entry><entry>Input 7</entry></row>
		<row><entry>30</entry><entry>Input 8</entry></row>
		<row><entry>10</entry><entry>Input 9</entry></row>
		<row><entry>9</entry><entry>Input 10</entry></row>
		<row><entry>8</entry><entry>Input 11</entry></row>
		<row><entry>7</entry><entry>Input 12</entry></row>
		<row><entry>6</entry><entry>Input 13</entry></row>
		<row><entry>5</entry><entry>Input 14</entry></row>
		<row><entry>4</entry><entry>Input 15</entry></row>
		<row><entry>3</entry><entry>Input 16</entry></row>
		<row><entry>29</entry><entry>Input 17</entry></row>
		<row><entry>28</entry><entry>Input 18</entry></row>
		<row><entry>27</entry><entry>Input 19</entry></row>
		<row><entry>26</entry><entry>Input 20</entry></row>
		<row><entry>25</entry><entry>Input 21</entry></row>
		<row><entry>24</entry><entry>Input 22</entry></row>
		<row><entry>23</entry><entry>Input 23</entry></row>
		<row><entry>22</entry><entry>Input 24</entry></row>
		<row><entry>11</entry><entry>Ground</entry></row>
		<row><entry>13</entry><entry>Ground</entry></row>
		<row><entry>15</entry><entry>Ground</entry></row>
		<row><entry>17</entry><entry>Ground</entry></row>
		<row><entry>19</entry><entry>Ground</entry></row>
		<row><entry>21</entry><entry>Ground</entry></row>
		<row><entry>18</entry><entry>+5 vdc</entry></row>
		<row><entry>20</entry><entry>+5 vdc</entry></row>
		<row><entry>16</entry><entry>+12 vdc</entry></row>
		<row><entry>14</entry><entry>+-12 vdc</entry></row>
	      </tbody>
	    </tgroup>
	  </table>
	</sect3>
      </sect2>
  </sect1>

  <sect1 xml:id="sect.gpio_switcher_devices.vguest">
    <title>Logitek vGuest</title>
    <variablelist>
      <varlistentry>
	<term>Driver Name:</term>
	<listitem>
	  <para>
	    Logitek vGuest
	  </para>
	</listitem>
      </varlistentry>
      <varlistentry>
	<term>Supported RML Commands:</term>
	<listitem>
	  <para>
	    <simplelist>
	      <member>GPI Enable ['<command>GE</command>']</member>
	      <member>GPI Set ['<command>GI</command>']</member>
	      <member>GPO Set ['<command>GO</command>']</member>
	      <member>Set Display ['<command>SD</command>']</member>
	      <member>Switch Take ['<command>ST</command>']</member>
	    </simplelist>
	  </para>
	</listitem>
      </varlistentry>
    </variablelist>
    <para>
      Before using the driver, the resources within the Logitek Audio Engine
      system that you wish to control must be made available in a 'vGuest'
      account within the Logitek 'Supervisor' system.  Then, those same
      resources must be mapped within the Rivendell driver.  For the
      '<command>ST</command>'
      RML, the Logitek Engine Numbers and Device Numbers are mapped to 
      logical Rivendell <computeroutput>Inputs</computeroutput> and
      <computeroutput>Outputs</computeroutput> within the
      <computeroutput>Configure Inputs</computeroutput> 
      and <computeroutput>Configure Outputs</computeroutput> dialogs.
      For the GPO RMLs, various Logitek
      'switches' (by which we mean anything that can be turned on and off,
      such as faders feeds, not just GPIO) are mapped to logical Rivendell
      GPIO lines by means of their Logitek Engine, Device and Buss numbers.
    </para>
  </sect1>

  <sect1 xml:id="sect.gpio_switcher_devices.modbus">
    <title>Modbus TCP</title>
    <variablelist>
      <varlistentry>
	<term>Driver Name:</term>
	<listitem>
	  <para>
	    Modbus TCP
	  </para>
	</listitem>
      </varlistentry>
      <varlistentry>
	<term>Supported RML Commands:</term>
	<listitem>
	  <para>
	    <simplelist>
	      <member>GPI Enable ['<command>GE</command>']</member>
	      <member>GPI Set ['<command>GI</command>']</member>
	      <member>GPO Set ['<command>GO</command>']</member>
	    </simplelist>
	  </para>
	</listitem>
      </varlistentry>
    </variablelist>
    <para>
      This driver supports GPI devices that use the industry-standard
      Modbus TCP protocol at TCP port 502. The device to be controlled
      should be configured to use Modbus ID #1. For more information on
      Modbus, see http://www.modbus.org/.
    </para>
  </sect1>

  <sect1 xml:id="sect.gpio_switcher_devices.quartz1">
    <title>Quartz Electronics Type 1 Routing Protocol</title>
    <variablelist>
      <varlistentry>
	<term>Driver Name:</term>
	<listitem>
	  <para>
	    Quartz Type 1
	  </para>
	</listitem>
      </varlistentry>
      <varlistentry>
	<term>Supported RML Commands:</term>
	<listitem>
	  <para>
	    <simplelist>
	      <member>Fire Salvo ['<command>FS</command>']</member>
	      <member>Switch Take ['<command>ST</command>']</member>
	    </simplelist>
	  </para>
	</listitem>
      </varlistentry>
    </variablelist>
    <para>
      Control can done either by means of an RS-232C connection or by means of
      TCP/IP to TCP port 23.
    </para>
  </sect1>

  <sect1 xml:id="sect.gpio_switcher_devices.rossnkscp">
    <title>Ross NK Video Switchers (via SCP/A Serial Interface)</title>
    <variablelist>
      <varlistentry>
	<term>Driver Name:</term>
	<listitem>
	  <para>
	    Ross NK-SCP/A Interface
	  </para>
	</listitem>
      </varlistentry>
      <varlistentry>
	<term>Supported RML Commands:</term>
	<listitem>
	  <para>
	    <simplelist>
	      <member>Switch Take ['<command>ST</command>']</member>
	    </simplelist>
	  </para>
	</listitem>
      </varlistentry>
    </variablelist>
    <para>
      Control is done by means of an RS-232C connection to a NK-SCP/A serial
      interface. Serial port parameters should be set to 9600 baud rate,
      no parity, 8 data bits, 1 stop bit, CR termination. The Breakaway
      to use is defined by setting the 'Card' parameter in the driver
      configuration, with Card 0 = Breakaway 1, Card 1 = Breakaway 2, etc.
    </para>
  </sect1>

  <sect1 xml:id="sect.gpio_switcher_devices.modemlines">
    <title>Serial Port Modem Control Lines</title>
    <variablelist>
      <varlistentry>
	<term>Driver Name:</term>
	<listitem>
	  <para>
	    Serial Port Modem Control Lines
	  </para>
	</listitem>
      </varlistentry>
      <varlistentry>
	<term>Supported RML Commands:</term>
	<listitem>
	  <para>
	    <simplelist>
	      <member>GPI Enable ['<command>GE</command>']</member>
	      <member>GPI Set ['<command>GI</command>']</member>
	      <member>GPO Set ['<command>GO</command>']</member>
	    </simplelist>
	  </para>
	</listitem>
      </varlistentry>
    </variablelist>
    <para>
      This driver enables GPIO via the modem control lines on an RS-232C
      serial device. The lines map as follows:
    </para>
    <table frame="all">
      <title>Modem Serial Lines GPI Signal Mapping</title>
      <tgroup cols="2" align="left" colsep="1" rowsep="1">
	<colspec colname="GPI" />
	<colspec colname="Signal" />
	<thead>
	  <row><entry>Output</entry><entry>Buss</entry></row>
	</thead>
	<tbody>
	  <row><entry>1</entry><entry>Data Set Ready (DSR)</entry></row>
	  <row><entry>2</entry><entry>Clear To Send (CTS)</entry></row>
	  <row><entry>3</entry><entry>Carrier Detect (CI)</entry></row>
	  <row><entry>4</entry><entry>Ring Indicator (RI)</entry></row>
	</tbody>
      </tgroup>
    </table>
    <table frame="all">
      <title>Modem Serial Lines GPO Signal Mapping</title>
      <tgroup cols="2" align="left" colsep="1" rowsep="1">
	<colspec colname="GPI" />
	<colspec colname="Signal" />
	<thead>
	  <row><entry>Output</entry><entry>Buss</entry></row>
	</thead>
	<tbody>
	  <row><entry>1</entry><entry>Data Terminal Ready (DTR)</entry></row>
	  <row><entry>2</entry><entry>Ready To Send (RTS)</entry></row>
	</tbody>
      </tgroup>
    </table>
  </sect1>

  <sect1 xml:id="sect.gpio_switcher_devices.sas16000">
    <title>Sierra Automated Systems 16000(D) Audio Router</title>
    <variablelist>
      <varlistentry>
	<term>Driver Name:</term>
	<listitem>
	  <para>
	    SAS 16000(D)
	  </para>
	</listitem>
      </varlistentry>
      <varlistentry>
	<term>Supported RML Commands:</term>
	<listitem>
	  <para>
	    <simplelist>
	      <member>Switch Take ['<command>ST</command>']</member>
	    </simplelist>
	  </para>
	</listitem>
      </varlistentry>
    </variablelist>
    <para>
      Both analog and AES3 digital (D) variants are supported. Control
      can done by means of an RS-232C connection to the 'User Serial
      Interface' port on the unit.  Serial port parameters should be:
      9600,N,8,1.
    </para>
  </sect1>

  <sect1 xml:id="sect.gpio_switcher_devices.sas32000">
    <title>Sierra Automated Systems 32000 Audio Router</title>
    <variablelist>
      <varlistentry>
	<term>Driver Name:</term>
	<listitem>
	  <para>
	    SAS 32000
	  </para>
	</listitem>
      </varlistentry>
      <varlistentry>
	<term>Supported RML Commands:</term>
	<listitem>
	  <para>
	    <simplelist>
	      <member>Switch Add ['<command>SA</command>']</member>
	      <member>Switch Level ['<command>SL</command>'] (requires appropriate SAS hardware support)</member>
	      <member>Switch Remove ['<command>SR</command>']</member>
	      <member>Switch Take ['<command>ST</command>']</member>
	    </simplelist>
	  </para>
	</listitem>
      </varlistentry>
    </variablelist>
    <para>
      Control is done by means of an RS-232C connection to the 'Computer
      RS-232' port on the AXC-8 System Controller.  Serial port parameters
      should be set to 9600 baud rate, no parity, 8 data bits, 1 stop bit
      and no terminator.  The AXC-8 must be equipped with firmware built to
      use the 'conventional' command protocol -- the 'enhanced' version will
      not work!
    </para>
  </sect1>

  <sect1 xml:id="sect.gpio_switcher_devices.sas64000">
    <title>Sierra Automated Systems 64000 Audio Router</title>
    <variablelist>
      <varlistentry>
	<term>Driver Name:</term>
	<listitem>
	  <para>
	    SAS 64000
	  </para>
	</listitem>
      </varlistentry>
      <varlistentry>
	<term>Supported RML Commands:</term>
	<listitem>
	  <para>
	    <simplelist>
	      <member>Switch Take ['<command>ST</command>']</member>
	    </simplelist>
	  </para>
	</listitem>
      </varlistentry>
    </variablelist>
    <para>
      Control is done by means of an RS-232C connection to the 'Computer
      RS-232' port on the AXC-8 System Controller.  Serial port parameters
      should be set to 9600 baud rate, no parity, 8 data bits, 1 stop bit
      and no terminator.  The AXC-8 must be equipped with firmware built to
      use the 'conventional' command protocol -- the 'enhanced' version will
      not work!
    </para>
  </sect1>

  <sect1 xml:id="sect.gpio_switcher_devices.sas64000gpi">
    <title>Sierra Automated Systems 64000 Audio Router</title>
    <variablelist>
      <varlistentry>
	<term>Driver Name:</term>
	<listitem>
	  <para>
	    SAS 64000-GPI
	  </para>
	</listitem>
      </varlistentry>
      <varlistentry>
	<term>Supported RML Commands:</term>
	<listitem>
	  <para>
	    <simplelist>
	      <member>GPO Set ['<command>GO</command>']</member>
	      <member>Switch Take ['<command>ST</command>']</member>
	    </simplelist>
	  </para>
	</listitem>
      </varlistentry>
    </variablelist>
    <para>
      Control is done by means of an RS-232C connection to the 'Computer
      RS-232' port on a GPI-1600 GPIO interface.  Serial port parameters
      should be set to 19200 baud rate, no parity, 8 data bits, 1 stop bit
      and no terminator.  This driver allows control of the system's GPO
      outputs as well as audio crosspoints.
    </para>
  </sect1>

  <sect1 xml:id="sect.gpio_switcher_devices.sasusi">
    <title>Sierra Automated Systems User Serial Interface (USI)</title>
    <variablelist>
      <varlistentry>
	<term>Driver Name:</term>
	<listitem>
	  <para>
	    SAS USI
	  </para>
	</listitem>
      </varlistentry>
      <varlistentry>
	<term>Supported RML Commands:</term>
	<listitem>
	  <para>
	    <simplelist>
	      <member>Console Label ['<command>CL</command>']</member>
	      <member>Fire Salvo ['<command>FS</command>']</member>
	      <member>GPO Set ['<command>GO</command>']</member>
	      <member>Switch Add ['<command>SA</command>']</member>
	      <member>Switch Crosspoint Gain ['<command>SX</command>']</member>
	      <member>Switch Level ['<command>SL</command>']</member>
	      <member>Switch Remove ['<command>SR</command>']</member>
	      <member>Switch Take ['<command>ST</command>']</member>
	      <member>Switch Take With Gain ['<command>SG</command>']</member>
	    </simplelist>
	  </para>
	</listitem>
      </varlistentry>
    </variablelist>
    <para>
      Control can done either by means of an RS-232C connection to one of
      the serial ports on a DRC-16E card or by means of TCP/IP to a PC
      running SAS's Server Module software. TCP connections are normally
      made to port 1350 on the Server Module system.
    </para>
  </sect1>

  <sect1 xml:id="sect.gpio_switcher_devices.acu1p">
    <title>Sine Systems ACU-1 (Prophet Version)</title>
    <variablelist>
      <varlistentry>
	<term>Driver Name:</term>
	<listitem>
	  <para>
	    Sine ACU-1 (Prophet)
	  </para>
	</listitem>
      </varlistentry>
      <varlistentry>
	<term>Supported RML Commands:</term>
	<listitem>
	  <para>
	    <simplelist>
	      <member>Switch Add ['<command>SA</command>']</member>
	      <member>Switch Remove ['<command>SR</command>']</member>
	      <member>Switch Take ['<command>ST</command>']</member>
	    </simplelist>
	  </para>
	</listitem>
      </varlistentry>
    </variablelist>
    <para>
      Control is done by means of an RS-232C connection to the RS-232
      port on the unit.  Serial port parameters in RDAdmin should be set
      to 57600 baud rate, even parity, 8 data bits, 1 stop bit and no
      terminator.
    </para>
    <para>
      The ACU-1 should be set to use factory default settings. This can
      be done by simultaneously pressing buttons 1 and 8 on the front
      panel of the unit for at least one second.
    </para>
  </sect1>

  <sect1 xml:id="sect.gpio_switcher_devices.swauthority">
    <title>Software Authority Protocol</title>
    <variablelist>
      <varlistentry>
	<term>Driver Name:</term>
	<listitem>
	  <para>
	    Software Authority Protocol
	  </para>
	</listitem>
      </varlistentry>
      <varlistentry>
	<term>Supported RML Commands:</term>
	<listitem>
	  <para>
	    <simplelist>
	      <member>GPI Enable ['<command>GE</command>']</member>
	      <member>GPI Set ['<command>GI</command>']</member>
	      <member>GPO Set ['<command>GO</command>']</member>
	      <member>Switch Take ['<command>ST</command>']</member>
	    </simplelist>
	  </para>
	</listitem>
      </varlistentry>
    </variablelist>
    <para>
      Used to control devices (such as the Axia 'PathFinder' system)
      by means of the 'Software Authority' protocol. Control is by
      means of a TCP/IP connection (typically to port 9500) on the
      controled system.  The <computeroutput>Card</computeroutput>
      parameter should be set to the 'Router Number' of the router
      to be controlled.
    </para>
    <para>
      Most parameters, including the number of inputs and outputs as
      well as the endpoint names, are autodetected by the driver.
    </para>
  </sect1>

  <sect1 xml:id="sect.gpio_switcher_devices.starguide3">
    <title>Starguide III Satellite Receiver</title>
    <variablelist>
      <varlistentry>
	<term>Driver Name:</term>
	<listitem>
	  <para>
	    StarGuide III
	  </para>
	</listitem>
      </varlistentry>
      <varlistentry>
	<term>Supported RML Commands:</term>
	<listitem>
	  <para>
	    <simplelist>
	      <member>Switch Take ['<command>ST</command>']</member>
	    </simplelist>
	  </para>
	</listitem>
      </varlistentry>
    </variablelist>
    <para>
      Control is done by means of an RS-232C connection to the
      RS-232 port on the unit. The port should be configured on the
      receiver to use a speed of 9600. Serial port parameters in RDAdmin
      should be set to 9600 baud rate, no parity, 8 data bits, 1 stop bit
      and no terminator. Once configured, use RDAdmin to create inputs that
      correspond to the StarGuide Provider and Source IDs available on the 
      selected DVB carrier. Provider and Source ID data is available from
      the provider network.
    </para>
  </sect1>

  <sect1 xml:id="sect.gpio_switcher_devices.unity4000">
    <title>Wegener Unity4000 DVB Satellite Receiver</title>
    <variablelist>
      <varlistentry>
	<term>Driver Name:</term>
	<listitem>
	  <para>
	    Wegener Unity 4000
	  </para>
	</listitem>
      </varlistentry>
      <varlistentry>
	<term>Supported RML Commands:</term>
	<listitem>
	  <para>
	    <simplelist>
	      <member>Switch Take ['<command>ST</command>']</member>
	    </simplelist>
	  </para>
	</listitem>
      </varlistentry>
    </variablelist>
    <para>
      Control is done by means of an RS-232C connection to one of the two
      RS-232 ports on the unit. If possible, use serial port number one,
      as the reciever uses a larger data buffer with that port. The
      selected port should be configured in the reciever to be of type
      "Terminal" with a speed of 19200. Serial port parameters should be
      set to 19200 baud rate, no parity, 8 data bits, 1 stop bit
      and no terminator. Once configured, use RDAdmin to create inputs that
      correspond to the DVB stream names available on the selected DVB
      carrier.
    </para>
    <para>
      Caution is needed when scheduling record events from the Unity4000, as
      the unit is capable of outputting a given DVB stream to only a single 
      output at a time. Commanding a stream to an output will cause that 
      stream to be silently deselected from a previously selected output.
    </para>
  </sect1>

  <sect1 xml:id="sect.gpio_switcher_devices.wheatnet_lio">
    <title>Wheatnet Blade LIO</title>
    <variablelist>
      <varlistentry>
	<term>Driver Name:</term>
	<listitem>
	  <para>
	    WheatNet LIO
	  </para>
	</listitem>
      </varlistentry>
      <varlistentry>
	<term>Supported RML Commands:</term>
	<listitem>
	  <para>
	    <simplelist>
	      <member>GPI Enable ['<command>GE</command>']</member>
	      <member>GPI Set ['<command>GI</command>']</member>
	      <member>GPO Set ['<command>GO</command>']</member>
	    </simplelist>
	  </para>
	</listitem>
      </varlistentry>
    </variablelist>
    <para>
      Control is done by means of a TCP/IP connection to port 55776 on a
      blade. The only required configuration parameters are
      <computeroutput>IP Address</computeroutput> and
      <computeroutput>IP Port</computeroutput>. The number of pins is
      auto-detected at driver startup.
    </para>
  </sect1>

  <sect1 xml:id="sect.gpio_switcher_devices.wheatnet_slio">
    <title>Wheatnet Blade SLIO</title>
    <variablelist>
      <varlistentry>
	<term>Driver Name:</term>
	<listitem>
	  <para>
	    WheatNet SLIO
	  </para>
	</listitem>
      </varlistentry>
      <varlistentry>
	<term>Supported RML Commands:</term>
	<listitem>
	  <para>
	    <simplelist>
	      <member>GPI Enable ['<command>GE</command>']</member>
	      <member>GPI Set ['<command>GI</command>']</member>
	      <member>GPO Set ['<command>GO</command>']</member>
	    </simplelist>
	  </para>
	</listitem>
      </varlistentry>
    </variablelist>
    <para>
      Control is done by means of a TCP/IP connection to port 55776 on a
      blade. The only required configuration parameters are
      <computeroutput>IP Address</computeroutput> and
      <computeroutput>IP Port</computeroutput>. The number of pins is
      auto-detected at driver startup.
    </para>
  </sect1>
</appendix>
