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

Bob Camp kb8tq at n1k.org
Mon Dec 1 21:10:38 EST 2014


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. 


> On Dec 1, 2014, at 8:59 PM, Graham <planophore at aei.ca> wrote:
> I got my pair of REF-0 and REF-1 to lock, REF-1 is now in STBY and the REF-0 is on. Thanks to Bob suggesting I wiggle and/or re seat the interface cable.
> However, I have not been able to "peek" inside using the DIAG port. Rather than try the hack suggested by Stu I bought a USB to RS-422 interface cable, a Startech ICUSB422. It has a DB-9P which plugs directly into the DIAG connector BUT on comparing it's pinout to the "hack cable" suggested by Stu, it seems that they really don't line up correctly.
> This is Stu's suggested "hack cable" from his very informative earlier post
> RFTG          PC
> DE-9P         DE-9S
> 7 <---GND---> 5
> 8 <---------  3 TXD
> 9  ---------> 2 RXD
> The ICUSB422 pinout is as follows (arrows point in direction of data flow)
> ICUSB             J8 - Diagnostic
> 1 TXD- -------->  8 (based on Stu's diagram and description)
> 2 TXD+ -------->  ??
> 3 RXD+ <--------  ??
> 4 RXD- <--------  9 (based on Stu's diagram and description)
> 5 GND  ---------  7 (based on Stu's diagram and description)
> 6 NC
> 7 NC
> 8 NC
> 9 NC
> But what pins to TXD+ and RXD+ connect to? After much searching and looking at a bewildering number of variations of pinouts, I am still confused on where these two go. A Wild Ass Guess (WAG) is that 2 TXD+ --> 4  and 4 RXD- <-- 5 but I am really uncertain and that is just based on one of the pinouts I found in my searchs.
> I thought I would be lucky and would just be able to plug and play with the ICUSB422 directly to the J8 Diagnostic port but it isn't so; I will need to make up an additional adapter to get the right pins going to the right pins.
> I am hoping someone on the list knows for certain. Failing that I will have to poke at it with a scope or DVM tomorrow and to see if I can make sense of it.
> cheers, Graham ve3gtc
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