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12.2. Input
registers
Input Registers are read using function code 04.
Note the values of all Input registers have corresponding Holding registers which can be used instead.
Input Registers (Analogue Inputs)
Register Name
Address
Modicon
Address
Details
Room Temperature
0
30001
Temperature value in °C multiplied by 10.
e.g. value 200 = 20°C
Fault Code (hex)
1
30002
0x8000 = No error
0x6999 = Bad communication with indoor unit
(Refer to indoor unit documentation for description of
other fault code values)
Firmware Version
3
30004
MelcoRETAIL MINI firmware version
Modbus Comms Counter
5
30006
Value of a counter which increments upon every valid
Modbus command received. Counter is reset to zero
when value exceeds 65535.
Fault Code (decimal)
8
30009
8000 = No error
6999 = Bad communication with indoor unit
(Refer to indoor unit documentation for description of
other fault code values)
Unused 9
30010
Current DIP Switch Values
10
30011
Occupancy Mode Input Value
(Least significant register)
11 30012
Value in mV if inputs are set to Voltage type.
Value in
Ω
if inputs are set to Resistance type.
Occupancy Mode Input Value
(Most significant register)
12 30013
Fan Speed Input Value
(Least significant register)
13 30014
Value in mV if inputs are set to Voltage type.
Value in
Ω
if inputs are set to Resistance type.
Fan Speed Input Value
(Most significant register)
14 30015
Mode Input Value
(Least significant register)
15 30016
Value in mV if inputs are set to Voltage type.
Value in
Ω
if inputs are set to Resistance type.
Mode Input Value
(Most significant register)
16 30017
Setpoint Input Value
(Least significant register)
17 30018
Value in mV if inputs are set to Voltage type.
Value in
Ω
if inputs are set to Resistance type.
Setpoint Input Value
(Most significant register)
18 30019
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