Procon MelcoBEMS MINI - 12.1. Holding registers

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12. Modbus tables – Air-To-Water systems
Some BMS controllers can only read Modbus Holding Registers, so the MelcoBEMS MINI (A1M) also exposes all Discrete, Coil and Input Registers as Holding Registers.
The Discrete Input registers and Input registers are not writable so their equivalent Holding Register is read only and marked [READ ONLY].
Some BMS controllers may not be able to read signed register values (i.e. values which can be negative in value), so the A1M also exposes an unsigned version of those
registers (these registers will not return a negative value).
12.1. Holding registers
Holding Registers are read using function code 03 and written to using either function code 06 or 16. Function code 06 is used when writing to a single holding register,
function code 16 is used for writing to multiple holding registers in the same command.
Holding Register (Analogue Output) Applicable Unit Type
Register Name Addr
Modicon
Address
Details
FTC4 FTC5
CAHV
master
CAHV
slave
CRHV
master
CRHV
slave
QAHV
master
EAHV
master
EAHV
slave
Modbus Slave ID 4 40005 Values 1 – 247 valid
9 9 9 9 9 9 9 9 9
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
9 9 9 9 9 9 9 9 9
RS-485 Parity Type 6 40007
0 = None
1 = Even
2 = Odd
9 9 9 9 9 9 9 9 9