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Preventing PTT and CW control getting stuck

Turning off RS-232 serial port control lines in case PTT switch or CW keying is stuck

These instructions apply to radio transceiver models and CAT interfaces, which uses RS-232 serial port RTS/DTR control lines to control the PTT switch and CW keying.

Serial port control lines may in some cases be left in a state, which keeps PTT switch or CW keying active. The issue leads to the radio transceiver having PTT or CW keying (in CW mode) stuck in active state, so that it is not possible to turn PTT or CW keying off.

In many cases, the RS-232 serial port RTS/DTR control lines control both the PTT switch and CW keying. The RTS control line usually controls PTT and the DTR control line controls CW keying, but it is necessary to check this from the radio or interface documentation.

In order to turn off RTS/DTR control lines to prevent PTT or CW keying getting stuck, add the following line to the configuration file below the line defining rigDevice for the serial port.

Turning off the RTS control line: (preserve the number of spaces)

      rtsState: false

Turning off the DTR control line: (preserve the number of spaces)

      dtrState: false

The final configuration for a radio with DTR control line turned off should follow the example presented below:

... (continued)
devices:
- id: "radio1-id"
  type: "rigctld"
  rigctld:
    localInstance:
      enabled: true
      model: RADIO_MODEL_NUMBER
      serialSpeed: SERIAL_SPEED
      rigDevice: "SERIAL_PORT_DEVICE"
      dtrState: false
... (continued)