Serial Port Modem Control Lines
| 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 C.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 C.6. Modem Serial Lines GPO Signal Mapping
| Output | Buss |
|---|---|
| 1 | Data Terminal Ready (DTR) |
| 2 | Ready To Send (RTS) |