[time-nuts] Kode 375-928 Display - Help! RS-422 & RS-485

[Brooke Clarke]

Hi Jason:

RS-422 and RS-484 are differential systems BUT can be directly connected to 
RS-232 equipment.  See: http://www.prc68.com/I/Trimpack.shtml#Com and look at 
the I/O cable paragraph and table.  Pay no attention to the pin letters for the 
mil connector and read the footnotes under the table.
Have Fun,

Brooke Clarke
http://www.PRC68.com
http://www.precisionclock.com



Jason Rabel wrote:
> Interesting you would mention that! After my first post I pulled the board
> with the connector and was looking at the traces from the DB-25. One of the
> chips nearby is a SN75176AP which I found a PDF saying it is a differential
> bus transceiver (RS422). I have a SBC that you can set the com port to
> RS232/422/485, so that's one little hurdle overcome.
> 
> There's quite a few pins wired, at first I was comparing it with the RS232
> DB-25 which most pins made sense. I should probably look up the others and
> see how they differ and such (I'm clueless when it comes to RS422/485, so
> I'll be googlin' tonight).
> 
> Jason
> 
> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
> Behalf Of Jack Hudler
> Sent: Wednesday, May 23, 2007 6:54 PM
> To: 'Discussion of precise time and frequency measurement'
> Subject: Re: [time-nuts] Kode 375-928 Display - Help!
> 
> It might be RS-485 and so multiple displaies could have its own address on a
> multidrop setup. 
> About the only trick there is finding out if its 2 or 4 wire 485 (probably 2
> because of the address).
> Think I've seen some USB to 485 converters on the market, but you might get
> away with driving it with RS-232.
> Go Google RS-485
> 
> 
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