Register 15 - Group1 Address
Group1 Address
Group addressing allows a write register (16) or write multiple registers (06) command to be
issued to a group of EVO/ECM-Modbus RTUs. This feature allows logical grouping of EVO/ECM-
Modbus RTUs to fit building floor plans and ease interactive control with other automated
systems within the facility.
The group address can be any address from 200 to 247. A group address should not be the same
as the unit address, or the unit address of any other RTU connected to the same trunk.
When the Modbus RTU Master writes to a group address, no RTU sharing the same Group 1
address should respond. Some Modbus Masters will generate communication error if they do not
receive a reply. In such case, the Group 1 Reply Flag in Register 14 in one RTU in the group should
be set to provide the reply.
Each RTU may have two group addresses, allowing overlap of group functions.
Register 16 - Group 2 Address
Group addressing allows a write register (16) or write multiple registers (06) command to be
issued to a group of EVO/ECM-Modbus RTUs. This feature allows logical grouping of EVO/ECM-
Modbus RTUs to fit building floor plans and ease interactive control with other automated
systems within the facility.
The group address can be any address from 200 to 247. A group address should not be the same
as the unit address, or the unit address of any other RTU connected to the same trunk.
When the Modbus RTU Master writes to a group address, no RTU sharing the same Group 1
address should respond. Some Modbus Masters will generate communication error if they do not
receive a reply. In such case, the Group 2 Reply Flag in Register 14 in one RTU in the group should
be set to provide the reply.
Each RTU may have two group addresses, allowing overlap of group functions.
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