Multi-Tech Systems 7600, 7500 manual Time Zone Adjustment, Daylight Savings Time Adjustment, Modem

Clock Module Settings ION 7500 / ION 7600 User’s Guide

Time Zone Adjustment:

The TZ Offset register specifies the time zone applicable to the area in which the meter resides. It is obtained by adding or subtracting the appropriate number of hours and minutes (hh:mm) from UTC time.

Daylight Savings Time Adjustment:

The DST Offset register holds the Daylight Savings Time offset applicable to the meter’s location. The DST Offset is the amount of time in hours and minutes (hh:mm) that the clock is adjusted when Daylight Savings Time begins.

NOTE

The setup registers, DST Offset and TZ Offset have no affect on the information recorded by a meter’s data and event recorders. These recorders always use UTC as their timestamped reference.

Communications Port Used for Synchronization:

The Time Sync Source setup register specifies which communications port receives time synchronization signals. Only signals received on the selected port are used for time synchronization; all other time synchronization signals are ignored.

Signals can be received on the following ports:

COM1 RS-232/RS-485 port	COM3 optical port
COM2 RS-485 port or optional internal	10Base-T Ethernet port
modem

NOTE

GPS Time Synchronization cannot be used with the Ethernet port, since time synchronization accuracy cannot be guaranteed--there is no way to determine when a packet will arrive over the Ethernet.

Time synchronization can be achieved using ION and DNP 3.0 protocols. GPS time synchronization uses special protocols defined for the type of GPS receiver you are using. The following table summarizes the time synchronization sources:

Source of Synchronization used	Protocol Register in the	Time Sync Type Register in	Clock Source Register in
for the Time Sync Source Register	Communications Module	the Clock Module	the Clock Module
ION	ION	UTC1	LINEFREQ, INTERNAL
DNP	DNP	UTC/LOCAL	LINEFREQ, INTERNAL
Arbiter 1092	GPS:ARBITER	UTC/LOCAL	COMM
	GPS:ARBITER-VORNE
True Time XL-DC	GPS:TRUETIME/DATUM	UTC/LOCAL	COMM
Datum Exac Time	GPS:TRUETIME/DATUM	UTC/LOCAL	COMM
Clark GPS-200-ASCII	GPS:TRUETIME/DATUM	UTC/LOCAL	COMM

1Note that ION time synchronization only uses the UTC setting; the LOCAL setting cannot be used.

Page 350 Time Synchronization & Timekeeping Technical Note