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Holding Registers (Analogue Outputs)
Register Name
Address
Modicon
Address
Details
Modbus RS-485 Baud Rate
5
40006
0 = 9600
1 = 1200
2 = 2400
3 = 4800
4 = 9600
5 = 14400
6 = 19200
7 = 28800
8 = 38400
9 = 56000
10 = 57600
11 = 115200
RS-485 Parity Type
6
40007
0 = None
1 = Even
2 = Odd
Drive On/Off
7
40008
0 = Drive OFF
1 = Drive ON
Room Temperature
[
READ ONLY
]
8 40009
Temperature value in °C multiplied by 10.
e.g. value 200 = 20°C
Fault Code (hex)
[
READ ONLY
]
9 40010
0x8000 = No error
0x6999 = Bad communication with indoor unit
(Refer to indoor unit documentation for description of
other fault code values)
Firmware Version
[
READ ONLY
]
10
40011
MelcoRETAIL MINI firmware version
Modbus Comms Counter
[
READ ONLY
]
11 40012
Value of a counter which increments upon every valid
Modbus command received. Value is automatically
reset to zero when value exceeds 65535.
Fault Code (decimal)
[
READ ONLY
]
12 40013
8000 = No error
6999 = Bad communication with indoor unit
(Refer to indoor unit documentation for description of
other fault code values)
System Type Detected
[
READ ONLY
]
13 40014
0 = ATA
1 = ATW
Deadband Enabled State
[
READ ONLY
]
14 40015
0 = Deadband disabled (DIP switch 8 OFF)
1 = Deadband enabled (DIP switch 8 ON)
BMS Room Temperature (signed)
15
40016
Signed temperature value in ºC multiplied by 10.
0xFF9C = -10ºC … 0x01F4 = 50ºC
BMS Room Temperature
16
40017
Temperature value in ºC multiplied by 10.
0 = 0ºC … 500 = 50ºC
BMS Virtual Setpoint
17
40018
Temperature value in ºC
Deadband Heating Setpoint
18
40019
Temperature in ºC (default 19ºC).
Value must be at least 2ºC lower than the Deadband
Cooling Setpoint.
Deadband Cooling Setpoint
19
40020
Temperature in ºC (default 23ºC).
Value must be at least 2ºC higher than the Deadband
Heating Setpoint.
Auto Mode Setpoint High Limit
32
40033
Temperature in ºC (default 30ºC).
Auto Mode Setpoint Low Limit
33
40034
Temperature in ºC (default 16ºC).
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