Well.... to be pedantic the RS-232 (EIA-232) spec says the following: " Valid signals are either in the range of +3 to +15 volts or the range −3 to −15 volts with respect to the "Common Ground" (GND) pin; consequently, the range between −3 and +3 volts is not a valid RS-232 level."
So the spacing signal should not be ground if you want to adhere strictly to the standard. Having said that, I'm sure it all works very well! 73 Eugene W2HX Subscribe to my Youtube Channel: https://www.youtube.com/@w2hx/videos -----Original Message----- From: elecraft-boun...@mailman.qth.net <elecraft-boun...@mailman.qth.net> On Behalf Of Jack Brindle via Elecraft Sent: Tuesday, November 28, 2023 11:48 AM To: Andy Durbin <a.dur...@msn.com> Cc: Elecraft@mailman.qth.net Subject: Re: [Elecraft] USB/3.5mm Extension? So that everyone reading understands, the KAT500 IS RS-232/IEEE-232 compatible in its voltage levels. It is NOT TTL (0,5v) compatible. 73, Jack, W6FB Sent from my iPhone > On Nov 28, 2023, at 10:14 AM, Andy Durbin <a.dur...@msn.com> wrote: > > > "Indeed, it is NOT true that the KAT500 uses TTL signal levels for the serial > port. " > > Ah, but I said "Isn't it true that the KAT500 USB cable uses RS-232 protocol > but TTL signal levels? " Perhaps I should have been more specific. My > recollection is that the USB/Serial cable transmits a TTL signal. I have no > way to know the receiver characteristics of that interface dongle. I did > study the KAT500 I/O schematic to understand that end of the connection. > > Anyway, not posting to "keep you on your toes". I was confused by this > interface when I first decided to work with it so didn't want people to > assume it was RS-232 compliant. > > 73, > Andy, k3wyc > > ______________________________________________________________ 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 w...@w2hx.com ______________________________________________________________ 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
