Multi-Tech Systems 7500 - Manual (Page 352)

GPS Time Synchronization ION 7500 / ION 7600 User’s Guide
Page 352 Time Synchronization & Timekeeping Technical Note
The Property Description area explains the purpose for each field.
The default time synchronization interval of 3,600 seconds (displayed in
milliseconds) is acceptable for most ION installations.
N OTE
You need appropriate permissions to configure the meters on your network. Refer to the technical note
ION Security for details on software and meter security.
GPS Time Synchronization
To implement a GPS scheme, you need a dedicated serial network. If you are
already using a serial link for communications with ION software, you need a
second serial network to transport GPS signals.
Either RS-232 or RS-485 networks can be used for GPS time synchronization,
though RS-485 is recommended if more than two meters are being synchronized.
If your GPS receiver output is RS-232 use the COM32 or equivalent RS-232/RS-485
converter that does not buffer communications. The COM128 is not recommended
if used in Repeater Mode.
N OTE
The ION 7700 has the highest possible synchronization accuracy using communications port 1 (COM1)
on the meter; however, COM2 and COM3 (via the Xpress Card) are still acceptable for time
synchronization.
Configuring for GPS Time Synchronization
To implement GPS time synchronization, use Designer software to configure the
Clock module and the Communications module:
1. Launch Designer and choose Show Toolbox from the Options menu if it is not
already displayed. Double-click the Clock module.
2. Set the Clock module’s Clock Source setup register to COMM .
GPS Receiver
RS-232 / RS-485
Converter
ION Network GPS Serial Network
ION Devices