Com Port Keying works fine for FLdigi and Digipan, but not for WSPR

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DL2WB
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Joined: 2010/09/03 - 12:20
Com Port Keying works fine for FLdigi and Digipan, but not for WSPR

I am running WSPR2.11 on a 12 years old Siemens Scenic laptop with WinXP SP2.
The problem is that the keying with Com2-RTS does not work properly, the TRX is always on TX. Com2 is the only externally available serial port of that laptop.

On the same laptop, I have FLdigi, Digipan and Hellschreiber installed and keying works fine with Com2-RTS.

So far I have changed the Com port settings and renamed it to Com1 or Com5, but no success.

WSPR2.0 shows the same behaviour on that laptop.

Has anybody an idea for the root cause of this problem ?