Setting The Unit Number - Omron K7GE-MG User Manual

3 Installation and Wiring
3-7

Setting the Unit Number

When you use the communications function, set a unit number for the Main
Unit.
You can set a number from 00 to 99. The power ON reset process (Reset
Key operation or turning the power ON again) is required. Make the settings
when the power is OFF.
Up to one master host system and 31 slave Main Units can be connected on the same
communications. The unit number is used to distinguish between slaves.
If Modbus RTU is selected as the protocol, use a unit number between 01 and 99.
If you communicate with the slave with unit number 00, slave address 00 will be broadcast in the Modbus RTU protocol.
However, the K7GE-MG does not support broadcasting.
The master executes a command by specifying
the unit number in the communications command.
Therefore, the slaves connected on the same
communications line must not have duplicate unit
numbers.
If the unit number is duplicated, there will be a
clash between the responses from multiple
slaves, which will result in a communications
error.
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No. 01
No. 01
Insulation Resistance Monitoring Device User's Manual (N224)
Master
Command
No. 02 No. 02
to No. 2
Response
Master
from No. 2
Incorrect
No. 02 No. 02