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In 73 Linux, how do I configure PTT to be by RTS of COM port?


 

I have a DigiRig Mobile in "Logic Levels Configuration." It is not sending to my Yaesu FTM-500D. Digi Tech Support says:
"Yes, PTT will not work unless you specifically configure it to be by RTS signal of COM port.
This subject is covered on page 56 of the direwolf manual: https://packet-radio.net/wp-content/uploads/2018/10/Direwolf-User-Guide.pdf"
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The part of the manual he's referring to says:
9.2.8.1 PTT with serial port RTS or DTR
To use a serial port (either built-in or a USB to RS232 adapter cable), use an option of this form:
PTT device-name [-]rts-or-dtr [ [-]rts-or-dtr ] For Windows the device name would be COM1, COM2, etc.
For Linux, the device name would probably be something like /dev/ttyS0 or /dev/ttyUSB0.
You can also use the Windows format. COM1 is converted to /dev/ttyS0, COM1 is converted to /dev/ttyS1, and so on.
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I have NO idea where to put that information. Unlike Windows, on Linux is it in the DireWolf config file?
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All I know is that my DigiRig is viewed as Card 3, Device 0 (zero), and it¡¯s connected to USB 0 (zero)
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Has anyone else encountered this issue?

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