[Elecraft] [K3] Serial port RTS problem [was: Different mode]

[David Christ]

It may be a too obvious comment, but the easiest way to tell what is 
going on is with a serial breakout box.  If you get one with LEDs you 
can visually watch the status of the control and data lines in real 
time.

David K0LUM

At 1:41 PM -0600 9/26/09, Bill W5WVO wrote:
>Julian, G4ILO wrote:
>
>>  I have never used VOX. Why would you need to? If you have a fully
>>  wired serial cable between the K3 and PC then just set WSJT to use
>>  that COM port and in the K3 menu configure PTT to use RTS.
>
>Julian et al.,
>
>I have always used VOX for WSJT keying, so I tried setting it up for 
>RTS control
>as you suggest above. But when I try to configure the K3 for ether PTT=RTS or
>PTT=DTR with NO RS232-controlling application (like WSJT) running, 
>the rig keys
>up (and switches into TEST mode automatically as per the manual). If I then
>disconnect the serial cable at the laptop serial connector, the 
>keyed condition
>disappears.
>
>My conclusion is that the laptop's serial port is asserting RTS and DTR
>full-time for some reason. It's a 2-year-old Dell Latitude D820, Core2
>processor, 2 GHz, 2 GB RAM, running XP Home. It has one true RS232 
>port (COM1),
>the one I'm using. Flow control is set to NONE, so it should not be asserting
>these lines by default. Has anyone ever encountered this?
>
>Bill W5WVO
>
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