Lance, I would not think you could apply raw RS-232 levels (up to +/- 25 volts) to any input of the KX3 other than those designed to accept those levels - and that certainly would apply to the GPIO. I would expect it to accept a maximum of 5 volts and a low level of zero volts - so you need the one-transistor circuit no matter which way you plug it.
73, Don W3FPR On 3/5/2012 2:50 PM, W7GJ, Lance wrote: > Hello Olli, > > The advantage is that I could possibly pull out the RTS line from my one > RS232 cable > to the computer, and simply add it to the amplifier PTT plug in ACC2. I > would not > have to build a transistor switch to directly trigger the PTT line, which > would have > to be broken out from the custom MIC plug. > ______________________________________________________________ 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
