ZLP Electronics DigiMaster Pro3, Manual

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Press F8 to open the configuration window.
In the PTT section select PTT COM port, and enter the comport to be used for PTT and select RTS
(ONLY). You need to use the value that was provided by device manager and by the test program
which may not be the same as the value shown in the example);
PTT is now set.
KENWOOD RADIOS !
NOTE: Many radios will also operate DATA modes correctly if you configure PTT to be activated via
the radios CAT system. KENWOODS DO NOT ! When activating PTT via the CAT system on a
Kenwood radio the microphone is opened for input and the Acc socket is muted - ***DATA INPUT IS
MUTED*** and you will have no data signal... If you activate PTT via the DATA socket on a Kenwood
the DATA socket is opened and the microphone is muted.