Remote Monitoring; Communications Overview - Omron K7GE-MG User Manual

6-2

Communications Overview

Communications Method
This is a master/slave system in which multiple K7GE-MG slave Units are connected to one master
host system.
Slave Units connected to the same communications line are distinguished by a unique unit number.
The commands sent by the master reach all the
slaves, but the unit number is embedded in the
command frame, so that the slave determines
whether a command is addressed to itself and
only returns a response to a command addressed
to itself.
Refer to 3-7 Setting the Unit Number on page
3-14 for the procedure to set the unit number.
The master host system sends a command frame,
and the K7GE-MG slave Unit returns a response
frame corresponding to the contents of the
command. One command frame and one
response frame make a pair.
The starting point of communications is the command frame sent from the master. When a change in
status occurs that should be notified to the slave, it cannot be notified unless there is an inquiry from the
master. Therefore, the master must poll at appropriate intervals to determine the slave status.
Insulation Resistance Monitoring Device User's Manual (N224)

6 Remote Monitoring

No. 01 No. 02
No. 01 No. 02
Host Command frame
system
K7GE-MG
Response frame
Command
Master
to No. 2
No. 03
Response
Master
from No. 02
No. 03
Command frame
6 - 3
6