Thanks for the help, I will check with the FLDIGI group and see what they say.
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If I understand it correctly, on a TS-2000 if you issue a TX Cat command, it will enable PTT, but it expects audio input from the Mic. If you raise RTS high on the ACC2 port, it will enable PTT and accecpt audio from the ACC2 port and mute the mic. If you look at the CAT commands for the TS-590 you ...
No, I was focusing on: I needed to be able to toggle the PKS line (pin 9) on the ACC2 port. When the PKS line is held Low (Grounded) the MIC connection on the front of the radio is muted/disabled and audio input to the radio is accepted via the PKD line (pin 11) on the ACC2 port. This is done by ena...