29
Holding Registers (Analogue Outputs)
Register Name Address
Modicon
Address
Details
BACnet Device Instance (most
significant 16 bits)
272 40273 Most significant 16 bits of the 32-bit Device Instance
BACnet Device Instance (least
significant 16 bits)
273 40274 Least significant 16 bits of the 32-bit Device Instance
BACnet Max Master 274 40275 Maximum number of masters to search for
BACnet Max Info Frames 275 40276
BACnet APDU Timeout 276 40277 Timeout value in ms for client requests
BACnet APDU Retries 277 40278 Number of times to retry after timeout
11.2. 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)
MelcoBEMS MINI (A1M) Firmware
Version
3 30004 MelcoBEMS MINI (A1M) 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)
System Type Detected 9 30010
0 = ATA
1 = ATW
2 = Lossnay
255 = Undetermined (no unit detected yet)
Deadband Enabled State 10 30011
0 = Deadband disabled (DIP switch 8 OFF)
1 = Deadband enabled (DIP switch 8 ON)
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