RJ45 is commonly used for RS232C. Millions of Cisco routers and switches built over the past 20+ years use this arrangement, as do many other devices. I have a half dozen of these cables - they once were shipped with the router. Although I don't know for sure, I'll bet the pinout is the same as Cisco.
I can make up 10 RJ45 connectors in the time it takes to make a soldered DB9. Historically, RS232 was used in electromagnetic applications where there was a need to drive a relay with line levels. Since modern equipment doesn't need this - since TTL became commonplace in the 1970's - and since many lower power devices no longer have 12V power supplies, it has been practice to observe a ONE state at a voltage of 3V+. If you really want some detail, check out the data sheet on your favorite RS232 driver chip. Here's an example: http://cds.linear.com/docs/en/datasheet/11801afb.pdf 73, Mickey N4MB > On Aug 22, 2015, at 8:31 PM, Bob McGraw - K4TAX <rmcg...@blomand.net> wrote: > > The K3S has a RJ-45 connector for the RS-232 communications. Now that's > different! Of course they supply a cable with a RJ-45 on one end and a > DB-9F on the other. And then to keep everybody happy, there is what appears > to be a 15 pin VGA connector that is the ACC connector to provide band data > and such. The manual clearly states "This is not a VGA video connector". > > Yes it is very important to read and understand the manual before plugging or > inserting any connector into any hole on any radio today. It seems most hams > think if it plugs in, then it should work. > > 73 > Bob, K4TAX > K3S s/n 10,163 > >> On 8/22/2015 7:17 PM, Richard W. Solomon wrote: >> It seems to me that using a DB-9 connector for non-RS232 uses is taking the >> Easy way out. >> There are numerous other connectors that could be used to alleviate any >> Misunderstanding. >> >> Not everyone goes through manuals with a fine tooth comb to locate the >> "gotchas". >> >> 73, Dick, W1KSZ >> >> -----Original Message----- >> From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Jim >> Brown >> Sent: Saturday, August 22, 2015 4:25 PM >> To: elecraft@mailman.qth.net >> Subject: Re: [Elecraft] K2 - KPA100 RS232 interface repair >> >> Hi Floyd, >> >> I've owned and operated a pair of K2s, both of which I bought used. >> Elecraft makes it very clear that the DB9 connector on the K2 is NOT an >> RS232 interface, that it is not RS232 compliant, and that a standard >> RS232 cable should NOT be used. Rather, the DB9 connector provides both >> serial control AND several control functions. >> >> The DB9 connector is a generic part, and can be used for many things besides >> RS232. It is also well known that while the RS232 Standard defines voltage >> levels, MANY modern products produce far less than those levels. >> >> I've owned a lot of gear in my lifetime, and the first thing I do is open >> the manual, study it, study the wiring of the various connectors, study the >> specs, and study the operating instructions. >> >> 73, Jim K9YC >> >> >> >>> On Sat,8/22/2015 1:28 PM, Floyd Sense wrote: >>> Hi Don. I'm sure you're aware that the RS232 spec includes the >>> description of voltage levels, and if you're going to refer to an >>> interface as RS232 (as Elecraft does in many places) then you're >>> implying that the normal RS232 signal levels will be used. A user >>> shouldn't be required to read a one hundred page manual before >>> plugging in a connector when every other such connector works in the >>> conventional way. Having been a designer using RS232 interfaces 45 >>> years ago, I would have been executed had I designed something like this. >> ______________________________________________________________ >> 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 w1...@earthlink.net >> >> ______________________________________________________________ >> 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 rmcg...@blomand.net > > > ______________________________________________________________ > 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 fishflor...@gmail.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
