The Z38xx and similar SCPI receivers are a special case. Their time code
message is specifically synchronized to the 1PPS. If you enter the :PTIM:TCOD?
command to get the time message, the receiver "blocks" for up to a second until
the 1PPS time. They also have a second serial port dedicated just to the time
code message.
In the Symmeticom UCCM-P receivers the time code will even come out in the
middle of things like the SYST:STAT? message or while the user is typing a
command. The Trimble UCCM receivers will skip sending the time code message if
cannot be sent due to other output going on at the tome or the user is typing a
command.
Most timing receivers also carefully control when the time message is sent,
particularly when operating in binary message mode.
---------------------------
>In case anybody is concerned about the PC end of serial timing, I have good
>data from a Z3801A feeding Linux. With ntpd's filtering, it's well under a
>ms.
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