I don't have an ACOM, SteppIR-controller, or Expert 1-KFA. I'd suggest that you don't want two TxD connections on an RS-232 "Y" connector. You need one from the PC to the K3. I don't think you want TxD from K3 to ACOM.
RS-232 is not a protocol that permits two senders. It's ok to "sniff" the Rx line, multiple receivers. I doubt that the ACOM (or the Expert) polls the K3. I bet they are passive listeners. You need frequency messages to be presented to the ACOM on QSY. The "normal" technique for this is to turn on K3 Auto Info (a K3 menu configuration selection). Then as you QSY (or actually, your QSY stops), the K3 sends a message with the new frequency. If you are running a logging program, it probably polls the K3 for frequency often, and the ACOM can "sniff" those responses, and then the K3 Auto Info isn't as necessary. Some loggers don't mind if you leave Auto Info on. It's just extra information on change and the logger can either ignore or exploit those unsolicited messages. However it's possible that some loggers might not deal well with unexpected messages that can occur in "auto info" mode. Then K3 Auto Info has to be turned off (or the logging program needs to learn to deal with unexpected auto info messages). I think you're close, but I wouldn't connect two senders... 73 de Dick, K6KR -----Original Message----- From: Elecraft [mailto:[email protected]] On Behalf Of Bill Turner Sent: Saturday, September 13, 2014 7:03 AM To: [email protected] Cc: Elecraft Subject: Re: [Elecraft] [acom-list] Re: Elecraft K3 and ACOM 2000A ------------ ORIGINAL MESSAGE ------------(may be snipped) On Sat, 13 Sep 2014 12:36:40 +0600, UA9CDC wrote: >I do not have ACOM2000 but I use the same arrangement with Expert 1-KFA >and K3. Logging program polls the radio and the amp only "listens" for >K3 response to learn the operating freq. When you terminate logger >there is no polling anymore. Therefore the system does not work as >expected. This is normal. REPLY: So the K3 does not send data unless polled? OK, now things make more sense. This explains why, if you're not using the Y connector to your computer, your data cable must have the TXD wire so the ACOM can poll the K3. Is my assumption correct? The ACOM does poll the K3 in that case? Things are finally coming clear. I wish this had been explained in the ACOM manual. Many thanks to all who replied on this issue. 73, Bill W6WRT ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
