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ION 7500 / ION 7600 User’s Guide GPS Time Synchronization
Time Synchronization & Timekeeping Technical Note Page 353
3. Specify which COM port will receive time synchronization signals by setting the
Time Sync Source setup register in the meter’s Clock module; Ethernet is not be
used with GPS time synchronization. Only signals received on the port
specified are used for synchronization.
4. Specify the receiver you want to use by selecting it from the Protocol setup
register in the receiving port’s Communications module (see table below).
You may need to modify the Time Sync Type setup register, if a DNP Master is
sending time broadcasts in local time.
Supported GPS Receivers
1
GPS:ARBITER-VORNE is only supported in the ION 8000 Series and ION 7500 / ION 7600 meters.
GPS Time Synchronization Format
Any GPS receiver may be used as a time synchronization source, as long as the
receiver outputs the ASCII time string (shown below) every second and has On
Time Mark (OTM). Use the table below to select the appropriate ‘protocol’ register
for each OTM type.
During normal operation of a GPS timesynching system, time signals are sent out
once per second as an ASCII string containing the time.
The ASCII time string for
GPS:ARBITER and GPS:TRUETIME/DATUM is the following:
<
SOH>DDD:HH:MM:SSQ<CR><LF>
The ASCII time string for
GPS:ARBITER-VORNE is the following:
44
HHMMSS<CR><LF>
55
DDD<CR><LF>
11
NN<CR><LF>
<
BEL>
GPS Receiver Comm Module Protocol Register Setting
True Time XL-DC series GPS:TRUETIME/DATUM
Datum ExacTime Series GPS:TRUETIME/DATUM
Arbiter 1092
GPS:ARBITER
GPS:ARBITER-VORNE
1
Clark and Associates GPS-200-ASCII GPS:TRUETIME/DATUM
On Time Mark (OTM) ‘Protocol’ Register
Start bit of <SOH> GPS:ARBITER
Start bit of <CR> GPS:TRUETIME/DATUM
Start bit of <BEL> GPS:ARBITER-VORNE