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Author Topic: Misbehaving Serial Port  (Read 1278 times)
AF4OX
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Posts: 20




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« on: October 08, 2010, 11:58:38 AM »

I moved to a faster PC - Dell OPtiplex GX620 running Windows XP3.  Now when I connect COM1 to my K3 radio, it keys the radio.  But if I launch Writelog, the port behaves as it should - reads freq, mode, and sends CW.  The port also supports the K3 utility to store the radio configuration.  Device manager says the port is working OK.  Looking at Setup before Windows launch, it seems all is OK with the port.  But when I plug the cable inthe K3, it keys the radio.  This did not happen on the older Dell.  Any suggestions.  I have spent two frustrating days on this.
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AA4PB
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« Reply #1 on: October 08, 2010, 12:22:14 PM »

Is the K3 keyed by one of the control pins on the port? Some Windows versions start with the port disabled, which might key the radio with the control pin. When you start the program it enables the port which reverses the polarity of some of the control pins.
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AF4OX
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« Reply #2 on: October 08, 2010, 03:29:00 PM »

Yes - The K3 is infact keyed by one of the seial pins - DTR if i remember correctly.  Is there a way to make the port inactive until opened by a program or change something in Windows?
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AF4OX
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« Reply #3 on: October 09, 2010, 08:02:57 AM »

Problem solved.  It turned out that with the new-faster PC, the COM port was not completely "idle" after XP booted.  It appears that DTR or RTS was in a state such that it operated the PTT circuit on the K3.  The K3 PTT configuration of Rts-Dtr worked OK on the old PC where the serial port was completely idle.  But not so with the new PC.  Changing the K3 PTT configuration to OFF-dtr fixed the problem.  I think this means the K3 ignores the state of rts.
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