wavin DRT-200 - Connect to Building Management System (BMS); 8.1 Communication; 8.2 MODBUS commands

Design Manual
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Heating and Cooling systems
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Wavin Tempower Control
Heating and Cooling systems
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The WTC-3 can communicate with the most of the BMS
system via the MODBUS-RTU communication protocol. The
BMS system can read and control the major of data inputs
(heating/cooling mode, temperatures and economy mode) of
the WTC-3.
8
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RS-485, half-duplex
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:
:
ON:switch turn to the
corner
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:
:
2 pcs twisted pair of wire
(example: CAT5 UTP)
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MODBUS-RTU
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9600bps
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N
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:
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TIMEOUT = 500ms
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max 32 pcs r
egister
or 256 bit
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Commands Code (dec) Action
Get Coils 01 to bit read out
Get Bits 02 to bit read out
Get Holding Regs 03 to register read out
Get Input Regs 04 to register read out
Set Bit 05 to bit writing
Write Single Register 06 to register writing
Set N Bits 15 to more bit writing in same time
Set Holding Regs 16 to more register writing in same time
8
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Pin number Function
1 RS485-B
2 RS485-A
3 Free
4 GND (ground)
5 GND (ground)
6-8 Free