Check Line Detectors
v = cpo:okr()
Returns the state of the line detectors.
The line detectors can sense if there are voltages applied to the COM port, and therefore know if something is connected.
| Value | Description |
|---|---|
| 0 | Nothing detected |
| 1 | DCE detected (RX 2 / TX 3) |
| 2 | DTE detected (RX 3 / TX 2) |
| 3 | Both detected - error state or Y-lead |
This does not work for TTL level serial devices that are idle (i.e. at 0V)
It will detect both negative (the usual idle voltage) and positive values.