KRC2 and KX3
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Hello,
I'm trying to interface a KX3/KXPA with a kRC2 band decorder. Basically, I built a cable to connect the AuxBus pin on the KRC2 XCVR port t the GPIO input on the KX3-KXPA adapter cable, which is driven by KX3 ACC2 port. This doesn't seem to be working and I'm not sure the right setting is enabled for the ACC2 port to allow for AuxBus communications. Has anyone tried this? Any help is appreciated.... 73, Robert-KP4Y/W4 Sent from my iPhone Sent from my iPhone ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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Robert,
The KX3 ACC2 I/O menu parameter should be set to TRN CTRL. The output of the KX3 ACC2 IO is 3 volt logic while to KRC2 uses 5 volt logic. It may be that the AUXBUS signal from the KX3 is not properly switching the input of the KRC2. You may have to add a 3V to 5V translation circuit. Note that I have not tried the KRC2 with the KX3. 73, Don W3FPR On 3/6/2016 1:40 PM, Robert Vargas-KP4Y via Elecraft wrote: > Hello, > > I'm trying to interface a KX3/KXPA with a kRC2 band decorder. Basically, I built a cable to connect the AuxBus pin on the KRC2 XCVR port t the GPIO input on the KX3-KXPA adapter cable, which is driven by KX3 ACC2 port. This doesn't seem to be working and I'm not sure the right setting is enabled for the ACC2 port to allow for AuxBus communications. Has anyone tried this? Any help is appreciated.... > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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In reply to this post by Elecraft mailing list
This is not a good idea - the two are not compatible. The KX3 does not speak the auxbus protocol the KRC2 needs, plus the voltage levels are not compatible.
The best way to use the KRC2 with the KX3 is to use serial port communications. Realize the KRC2’s highest data rate is 19200 bps. Also remember that the KRC2 does not implement the full EI-232 interface, so be sure to fabricate a cable that only connects pins 2, 3 and 5 to the radio (or computer). Jack Brindle, W6FB Elecraft Engineering > On Mar 6, 2016, at 10:40 AM, Robert Vargas-KP4Y via Elecraft <[hidden email]> wrote: > > Hello, > > I'm trying to interface a KX3/KXPA with a kRC2 band decorder. Basically, I built a cable to connect the AuxBus pin on the KRC2 XCVR port t the GPIO input on the KX3-KXPA adapter cable, which is driven by KX3 ACC2 port. This doesn't seem to be working and I'm not sure the right setting is enabled for the ACC2 port to allow for AuxBus communications. Has anyone tried this? Any help is appreciated.... > > 73, > Robert-KP4Y/W4 > > Sent from my iPhone > > > Sent from my iPhone > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[hidden email] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to [hidden email] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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In reply to this post by Elecraft mailing list
When Eric VA7DZ, Fred KE7X and I were all experimenting with KRC2s for
our K3s, I also connected mine to the KX3 with the help of Jack Brindle, KRC2 expert. Here's what I did to the KRC2 to make it work in between the KX3 and the computer: 1. Set KX3 menu item RS232 to 19200b. Set the appropriate software on the computer to 19,200 baud. 2. Use only the following jumpers in the KRC2: W3, W8, W9, W10, W21, W22, W23. 3. Make a special jumper wire to go from the RS-232 connector side of W11, to the RS-232 connector side of W20. This carries the DTR signal between the two RS-232 connectors without actually bringing it into the KRC2 circuit. It's voltage is incompatible with the KRC2, but it needs to be "carried through" if you intend to break out the DTR signal to, say, key the KRC2 with a transistor (or perhaps use DTR for PTT, or you could figure out the RTS pin on the RS-232 if you prefer). The circuit diagram in the KRC2 assembly and operating instructions booklet is very useful to help to understand the jumpers. Normally, for a K3, you'd use W16 to enable the Auxbus in the KRC2. W3 tells it to use the serial port, not the Auxbus. W8 sets it to 19,200 baud. W9 and W10 carry the pin 2 and pin 3 data for RS-232. As Jack said, it's important to only connect pins 2, 3, (both data) and 5 (ground) to the KRC2 circuit because the other pins of RS-232 are electrically incompatible with the KRC2. ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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