Serial outputs can usually drive several serial inputs if the cables are
short (to avoid reflections). You can wire it yourself, serial out from
the TB to both LH and NTP, serial in from LH only.
David
On 2/26/14 11:51 AM, David J Taylor wrote:
I'm running Meinberg NTP on the Windows 7 x64 machine to which my
Thunderbolt is attached.
I'd like to be able to share the serial port between LH and NTP so
that I can run the machine as an NTP Stratum 1 server locked to the
TB, and also be able to use LH to check things.
I looked around the with Google, and saw *numerous" serial port
splitters. Which is recommended?
Also what's the best way how to configure NTP to lock the the TB on a
serial port? Do I need to modify the TB to deliver the PPS down one
of the serial data lines or will NTP work well by parsing the NMEA
time messages?
Many thanks
David Partridge
=====================================
David,
Can't comment on the COM port splitters.
For best results with NTP you need a PPS signal on the RS-232 DCD
line. Using NMEA alone is often worse than just Internet sync. Look
for a white flash with my Serial Port LEDs program:
http://www.satsignal.eu/software/net.htm#SerialPortLEDs
The pulse needs to be rather more than a few microseconds - 100-200
milliseconds is typically used.
Cheers,
David
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