B.29. Serial Port Modem Control Lines
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## B.29. Serial Port Modem Control Lines

Driver Name:

  Serial Port Modem Control Lines

Supported RML Commands:

  GPI Enable ['GE']
  GPI Set ['GI']
  GPO Set ['GO']

This driver enables GPIO via the modem control lines on an RS-232C serial device. The lines map as follows:

Table B.5. Modem Serial Lines GPI Signal Mapping

Output | Buss
--- | ---
1 | Data Set Ready (DSR)
2 | Clear To Send (CTS)
3 | Carrier Detect (CI)
4 | Ring Indicator (RI)

Table B.6. Modem Serial Lines GPO Signal Mapping

Output | Buss
--- | ---
1 | Data Terminal Ready (DTR)
2 | Ready To Send (RTS)

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