11 Modbus registers
11.1 Modbus registers
Table 1: Register listing for unit with Vari Pro room controller
Vari Pro User Interface Register Map v 1.4 Modbus RTU RS485
Baudrate: 9k6, 19k2, 38k4
Parity: None, odd, even
Stop bits: 1, 2
Description Read/
Write
Min. Max. Unit Note(s)
Write register 16 bit integer register
4x00001 Application state W 1 = Stand-by (OFF)
2 = Normal
3 = Away
4 = Flush (set cool & heat
100%)
5 = Stopped
10 = Test mode (allow cool/
heat without fan)
4x00003 Fan speed control W 0 = OFF
1–3 = Speed
4 = Auto
4x00004 Room set point,
Normal
W x10C
4x00005 Room set point,
Away
W x10C
Read register 16 integer register
3x00004 Application state R 0 = Init
1 = StandBy
2 = Normal,
3 = Away
4 = Flush
10 = Test
3x00006 Current fan control R 0 4 0 = OFF
1–3 = Speed
4 = Auto
3x00007 Room temperature R °C x10
3x00008 Current room set
point
R °C x10
3x00009 Current fan speed R 0 100 %
3x00010 Cooling PID-output R 0 100 %
3x00011 Heating PID-output R 0 100 %
3x00103 Alarm “Unit 1” R Bit0: Condense sensor alarm
Bit1: Missing RPM from fan1
Bit2: Missing RPM from fan2
Bit3: Sensor fault, water in
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N03104128 Rev. A VariPro Room controller – Installation and Operation Manual
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