I have a UT+ It does 5V logic level pulses but I connect the TTL
level PPS to a MAX232 chip which converts the levels to +/- 8 volts
I think the problem is my long cable. I'm pushing about 80+ feet of
cat-5 cable. Looks like I will either have to move the equipment or
use RS422 drivers at each end. I'm going to try moving the equipment
to where I can use a quality 4 foot cable.
Chris Albertson
Redondo Beach, California
Chris, unless you are unlucky, that should be just fine for the
microsecond precision level. [We used to have /much/ longer runs of IIRC
Belden 8777 RS-232 cable running at 9600 baud or higher without issues -
well outside the theoretical specification]. Have you put a 'scope on the
signal at the input to the RS-232 receiver? Does it look clean? Is the
routing of the cat-5 cable near any "heavy" electrical equipment which may
produce noise - anything with a motor in or other interference producer?
Have you tried a different PC with a different OS or different NTP
version?
Cheers,
David
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