The output of the BCD pins is indeed TTL level, with coding as described in the KRC2 manual. If the BPFs need BCD input at +12 volts, probably the best way to do this would be to configure four output pins to output the desired BCD code for each band using the KRC2 Configuration Tool. I believe Fred described this in an email he posted here a short time ago. Be careful with driving a device from the BCD pins - if the device has pull-up resistors to +12 volts it could damage the KRC2's microcontroller. These signals have series 390 ohm resistors to provide the only protection to the MCU pins. They may not be adequate to prevent high voltage from damaging the chip.
The BCD pins act as inputs only when the KRC2 jumpers are configured for BCD in. Otherwise the pins are outputs, reflecting the currently selected band. As noted above, the coding is described in the KRC2 manual. It is NOT identical to a the K3 coding, with the difference being the 60m and 6m band codes. (60m = 0x0A, 6m = 0x0B, with 0x00 undefined). Now, for the important question, if I understand correctly, the answer is yes. The KRC2 should be able to drive both devices, taking its band input from the radio using the Auxbus, or serial lines. In fact this configuration is used by many folks. Jack Brindle, W6FB Sent from my iPad On Jul 1, 2013, at 7:51 AM, iain macdonnell - N6ML <a...@dseven.org> wrote: > Don, > > The manual says (on page 25 of rev C): > > "The remaining four drivers, labeled A, B, C and D, are TTL-compatible > inputs or outputs depending on the operating mode. In normal KRC2 or > analog modes, the terminals are outputs. In digital parallel input > mode, they become inputs, and receive the BCD-encoded band data." > > It doesn't specify that the output format is BCD, but I can't imagine > what else it would be... > > 73, > > ~iain / N6ML > > > On Mon, Jul 1, 2013 at 5:24 AM, Don Wilhelm <w3...@embarqmail.com> wrote: >> Joerg, >> >> The KRC2 can be configured to accept BCD data as input, but I see no >> reference that it provides BCD output. >> >> 73, >> Don W3FPR >> >> >> On 7/1/2013 8:05 AM, Jörg Rüschenschmidt wrote: >>> >>> Hi all, >>> >>> I have two devices which requires band data. >>> >>> >>> 1.) Bandpass filter with 12 volt input lines per band >>> >>> 2.) Antenna switch which requires a BCD coded input for automatic >>> switching >>> >>> >>> My intention is to use KRC2 in serial mode. I understood from >>> documentation >>> BCD coded band data information will be available on J4 in serial mode. >>> However I am not sure about this topic. My main interest is, could I use >>> one KRC2 to support both devices at the same time ? >> >> ______________________________________________________________ >> 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 > ______________________________________________________________ > 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 ______________________________________________________________ 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
