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update direwolf.txt with descption of audio PTT usage

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Andrew 2017-01-20 10:56:57 -08:00
parent 762799aaad
commit 910ca29fed
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direwolf.txt
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@ -234,10 +234,16 @@ C# Both can be used for interfaces that want them driven with opposite polarity.
C#
L# COM1 can be used instead of /dev/ttyS0, COM2 for /dev/ttyS1, and so on.
L#
C# With a suitable interface circuit an audio channel can also be used to
C# trigger the PTT control. The device should be specified as CHANNEL,
C# followed by the channel number and (optionally) the desired frequency,
C# in Hz, of the audio tone to be used. The frequency must be between
C# 50 and 20000 Hz and defaults to 1000 Hz.
C
C#PTT COM1 RTS
C#PTT COM1 RTS -DTR
L#PTT /dev/ttyUSB0 RTS
C#PTT CHANNEL 1 1000
C
L#
L# On Linux, you can also use general purpose I/O pins if