User's Manual

CHAPTER 3
Advanced Functions
26
route 2333
OK
MASTER
DESCRIPTION Set/resets the master flag of a specific device.
PARAMETERS The device ID and the flag value (on/off).
RETURNS OK or an error message.
REMARKS When a station has a master flag set, the gateway uses that station
for date/time synchronization. It is important to understand that
each remote station has an internal real-time clock, used to stamp
the stored data. This clock has to be initialized and synchronized,
which the gateway does automatically when either of the following
occurs:
• A station returns invalid time values (null or out of date).
• The host computer synchronizes the time of the gateway (such
as with a SET TIME command).
If the remote stations in a network are to be polled by more than
one base station, only one of those base stations should be used
to synchronize the time of a particular RTU. Otherwise, the remote
stations could get confused due to the time differences that might
occur between different base stations. Consequently, in a multi-
gateway network, only one gateway should have the master flag
set for a specific station; all other gateways should treat it as a
slave.
To verify whether a device has the master bit set, use the INSPECT
command (see page 31).
EXAMPLES master 2333 on
OK
master 2333 off
OK
EXTEND
This command is deprecated in emu3ap. It has been included for
compatibility purposes, but always returns OK.
SET Commands
The SET command has many subcommands, because as its name
implies, it sets various parameters of the emu3ap application. Most