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HRS Hevac Ltd AquaModule AMB
Installation, Operating & Instruction Manual
12
Modbus
12.1 Modbus communication
The controller includes a Modbus slave communication protocol, type Modbus
RTU RS485.
Connection between BMS (building management system) and Micro 3000
requires two polarized wires on C+ and C-, respectively labelled 25 and 26 on
controller C Bus terminal.
The connection via shielded cable is not required but can be performed with
the terminal 24 if long wire distance or electromagnetic disturbances into the
heating room. For this, it is necessary to unscrew the front panel.
Picture 16
Picture 17
12.2 Connecting multiple Micro 3000 control boxes
Rules to respect
Max length between BMS and farer control box: 500 meters
Connection continuity (C+ and C-) has to be done directly on the controller C Bus
terminal, without using derivation boxes. Respecting this, there are two wires per
terminal, except the farer control box.
Picture 18