[time-nuts] Communicating with the Lucent KS-24361

paul swed paulswedb at gmail.com
Mon Nov 10 14:58:07 EST 2014

Yes indeed for a real RS232 to RS 422 all 4 wires are required. Its a
balanced communications protocol.
The RS232 trick has been around many years. It ha sa low noise margin and
does work with most modern RS232 3.3-5V type adapters. Its simple and
generally works as it did for me.

On Mon, Nov 10, 2014 at 12:15 PM, Anthony Roby <aroby at antamy.com> wrote:

> I had been unsuccessful communicating with these units using the RS232 to
> RS422 cable hack that Stewart Cobb described in his original post (
> https://www.febo.com/pipermail/time-nuts/2014-October/087274.html).   I
> was able to see, via a scope, the data coming out of the REF 1 unit, but it
> was never picked up on the PC.
> I finally bought a USB to RS422/RS485 cable.  That didn't work out of the
> box - I needed to use the supplied breakout board to remap the pins to a
> DB9-M connector as follows (Tx- to pin 8, Tx+ to pin 4, Rx- to pin 9, Rx+
> to pin 5, Gnd to pin 7).  All 4 wires were needed for this to work.
> Thanks to Bob Camp and Tom Van Baak for their help on this
> Anthony
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