Time Synchronization using a GPS Receiver
Use GPS receivers at each Site if you require time synchronization of your
9700 Power Meter devices to be within ±1ms of Universal Time. To
implement GPS time synchronization, each 9700 Power Meter must be
equipped with the optional XPRESS CARD, as two communications links are
required at each device. The highest possible accuracy can be achieved
using COM 1 to receive time signals; however, COM 2 and COM 3 can be
used for time synchronization with slightly less accuracy than COM 1.
GPS Receiver
RS-232/RS-485
converter
COM 1 COM 1
COM 1
Xt
PRESS ARD
Xport
PRESS ARD
Xport
PRESS ARD
dedicated RS-485 network for time synchronization signals
Ethernet or RS-485 network for WinPM communications
Either RS-232 or RS-485 networks can be used for time synchronization,
however, RS-485 is recommended if more than two devices are being
synchronized. (Ethernet cannot be used for GPS time synchronization.)
Supported GPS Receivers
As of 9700 Power Meter V200, the following GPS receivers are supported:
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
Clark and Associates GPS-200-ASCII GPS : T R UETI ME/DATUM