Camus Hydronics Valiant FT VA0080, Manual

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7.0 BMS
The Valiant FT boiler has the capability to be accessed by a building management system (BMS) through Modbus RS485. In
case of a cascade system consisting of multiple Valiant FT boilers, the BMS should be accessing the master boiler.
Electrical Connection
The twisted pair wire coming from the BMS can be connected to the terminal block located under the control panel. The
designated BMS terminals are labelled as shown in the image below for ease of identification:
Software Connection
The following communication settings should be set for the BMS to establish communication with the Valiant FT:
Valiant FT Modbus Communication Settings
Protocol Modbus RTU
Slave Address 1
Baud Rate 9600 Baud
Data Length
8 bits
Parity No parity
Stop bits 2 stop bits
Flow Control None
Table 29: Valiant FT Modbus Communication Settings
Holding Registers
Once the electrical communication and protocol settings have been established between the BMS and the Valiant FT the
following Valiant FT registers can be accessed by the BMS. Note that some registers are only available for “Read” which means
that the BMS can only view the value of that specific register. The registers designated with “Write” allow the BMS to change/write
their values.
The following Table lists all the Modbus registers available in the Valiant FT controller for BMS access.
Table 30
Holding Registers Access
Read
Access
Write
Description Signed/unsigned Unit
126 7E X Outdoor_temp Unsigned °C
503
1F7 X X BM_TotalSystemSetpoint Signed °C
20001
4E21 X BM_CM_PowerLevel Signed %
20002 4E22 X BM_CM_Setpoint Signed °C
20021 4E35 X BM_CM_SystemTempSensor Signed °C
20022 4E36 X BM_CM_OutdoorTempSensor Signed °C
20061 4E5D X BM_CM_PumpStatus Unsigned
20101 4E85 X BM_Boiler_1_Available Signed
20102 4E86 X BM_Boiler_2_Available Signed
20103 4E87 X BM_Boiler_3_Available Signed
20104 4E88 X BM_Boiler_4_Available Signed
20105 4E89 X BM_Boiler_5_Available Signed
20106 4E8A X BM_Boiler_6_Available Signed
20107 4E8B X BM_Boiler_7_Available Signed