A small utility to set the clock on a Hayes Stack Chronograph over its serial port.
chronosync [-d] [-s serial speed] <serial device>
Compile with a BSD Make:
$ make
Install:
# make install
Run and pass argument of the serial device connected to the Chronograph:
# chronosync /dev/cua02
The computer's local time is sent to the Chronograph.
Since the Chronograph only supports setting the time to minute precision with
ATST, chronosync will sleep until zero seconds of the next minute before
sending the time.
The clock on the Chronograph will probably only need to be set once per day to stay accurate, so running this from cron once a day should suffice:
# sync time at 2am
1 59 * * * /usr/local/bin/chronosync /dev/cua02