[time-nuts] The Trimble NTPX26AB-06 / Z3801A
Hal Murray
hmurray at megapathdsl.net
Fri Nov 21 21:27:49 UTC 2008
> I have the Trimble NTPX26AB-06 and I have established that the I/O
> port (25 way D connector) has the same pin-outs as the Z3801A. Can any
> owners/users of these units advise me on a suitable (proved to work)
> interface adaptor from the RS-422 to RS-232. The unit works fine and
> is producing its 10 MHz output with very good accuracy, but I am
> looking forward to "seeing it" through its interface with TBolt Mon.
The Z3801A has both RS-422 and RS-232 level conversion chips inside. What
gets routed to to the connector is determined by either some jumpers on a
header or some zero ohm resistors. So it's easy to modify the unit to
directly speak RS-232.
I don't know what's in the NTPX26AB, but looking to see if there is an RS-232
chip seems like a good excuse to open it up and look around. :) (If you
haven't done it already.)
If you want to build an external converter box, I have schematics I found on
the web many years ago. They use LTC1318 or MAX3162. I'm sure there are
many other chips, but those are probably a reasonable place to start.
--
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