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Author Topic: Hex command to control PTT on MFJ-1275 thru RS232  (Read 732 times)
K0KVR
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Posts: 5




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« on: January 31, 2006, 04:16:57 PM »

Does anyone know the complete Hexadecimal command to control XMIT/RCV or the PTT switch on the MFJ-1275 sound card radio interface to open for audio thru an RS232 port? I am using TRX-Manager with TRX-Command and all I need is the Hex Command line. Last obstacle to operate RCOL.
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K0JEG
Member

Posts: 658




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« Reply #1 on: February 18, 2006, 04:18:06 PM »

There is none. The MFJ-1375 uses the DTR (data terminal ready) and/or CTS (clear to send) pins to key the transmitter.

This link (http://www.tldp.org/HOWTO/Serial-HOWTO-4.html#flow_control) offers an explanation of what the signals are. Google for examples of how to set them up on a PC (I used to be able to do it, but that was on an Atari 850 interface box).

Good luck with your project.
Eric
N3KQX - echolink #268847
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K0JEG
Member

Posts: 658




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« Reply #2 on: February 18, 2006, 04:18:46 PM »

There is none. The MFJ-1275 uses the DTR (data terminal ready) and/or CTS (clear to send) pins to key the transmitter.

This link (http://www.tldp.org/HOWTO/Serial-HOWTO-4.html#flow_control) offers an explanation of what the signals are. Google for examples of how to set them up on a PC (I used to be able to do it, but that was on an Atari 850 interface box).

Good luck with your project.
Eric
N3KQX - echolink #268847
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