[time-nuts] RS-232 port
Hal Murray
hmurray at megapathdsl.net
Mon Aug 10 03:11:05 UTC 2015
> I have an HP Z3805A with the nice faceplate and 6 leds on the front. I also
> have a Z3801A also with 6 LEDs. What is the difference in the com ports?
> The Z3805A works fine with a standard 25pin to 9 pin adapter. The Z3801
> does not. ...
The Z3801A comes setup for RS-422. The board is setup to support both
RS-232 or RS-422 depending on jumpers or 0 ohm resistors. Pictures here:
http://support.ntp.org/bin/view/Support/Z3801AReceiverModifications
It's pretty obvious after you take one apart and poke around with an ohm
meter. You can put a few of them back in different slots rather than the
actual jumpers in the pictures.
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