Hi Joe, It's an external automatic tuner for my small transmitting loop. Like the SteppIR device, it should just be grabbing frequency data from the radio. I'm not sure if it uses polling or not to get this data, however, as I don't actually own the device yet (looking at purchasing the upgraded tuner for specifically this use case, assuming I can figure out how to make it work.) I saw in the programmer's reference there's some auto-info mode that has the radio emit frequency on front-panel operation, and the ATU may enable that. Unfortunately, the ATU doesn't indicate exactly how it does communication.
Thank you, David On Fri, Jan 20, 2017 at 8:11 AM, Joe Subich, W4TV <li...@subich.com> wrote: > On 1/19/2017 10:53 PM, David Orman wrote: > >> I need an additional RS232 output in addition to the connection >>>> to the PC for an external device that needs to track the vfo >>>> frequency of the KX3. I'd like to have the PC able to track what >>>> frequency/control what frequency my radio is tuned to, and at the >>>> same time have my external device also tracking the frequency the >>>> KX3 is tuned to. >>>> >>> > David, > > What is the external device? Does it need to poll the KX3 or is it > satisfied by seeing the IF; and/or FA; responses to the logging > software? > > RS-232 is a point to point protocol and does not allow for multiple > active transmitters at the same time. However, in some cases one > can attach a second "receive only" device in parallel. The typical > connection is shown in the SteppIR "Y cable" schematic that I have > sent to you directly (ignore the jumper between pins 7 and 9 as that > is SteppIR specific). > > If both the computer and hardware device must poll independently, > you might be able to get away with a "Modem Data Splitter" like > one of these from B&B Electronics: http://www.bb-elec.com/Product > s/Serial-Connectivity/Serial-Data-Tools-Adapters/Port-Splitters.aspx> > but you need to be careful that both the logger and hardware device > do not send data to the KX3 at the same time since the modem data > splitter is passive (diode isolation) and the data will be corrupted > if both devices transmit at the same time. > > 73, > > ... Joe, W4TV > > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
