[time-nuts] Lucent KS-24361 RS-422 interface pinout

Anthony Roby aroby at antamy.com
Tue Dec 2 19:03:36 EST 2014

I sent you my posting earlier today, so hopefully you saw it.  The Lucent unit seems liberal in its interpretation of the pinouts, but once you've deciphered it and got the +ve and -ve pins connected, it works reliably.


-----Original Message-----
From: time-nuts [mailto:time-nuts-bounces at febo.com] On Behalf Of Graham
Sent: Tuesday, December 02, 2014 5:36 PM
To: time-nuts at febo.com
Subject: Re: [time-nuts] Lucent KS-24361 RS-422 interface pinout

Thanks all for answering my question. I looked through old posting but obviously didn't stumble upon Anthony's posting otherwise I would have had my answer.

I made up a short cable to connect the Startech ICUSB422 to the KS-24361
J8 Diagnostic port and I can now connect. This is the final pinout:

Startech                   KS-24361
ICUSB422               J8 - Diagnostic
   1  TXD- --------------> RXD- 8
   2  TXD+ --------------> RXD+ 4
   3  RXD+ <-------------- TXD+ 5
   4  RXD- <-------------- TXD- 9
   5  GND  --------------- GND  7
   6  NC
   7  NC
   8  NC
   9  NC

Seems RS-422 is a standard but pinouts vary. Live and learn.

cheers, Graham ve3gtc

On 2014-12-01 21:10, Bob Camp wrote:
> Hi
> If you dig back a month or so, there is a post with all the pinouts on all the connectors.
> 4 	RX+
> 8	RX-
> 5	TX+
> 6	TX-
> 3 and 7 	ground
> It ??s serial so TX on one goes to RX on the other. + goes to + and - to -.  The pins are numbered on the connector in *very* small print.
> Bob

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