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5.4 CONTROL / COMMUNICATION MODBUS
In order to control up to 23 modules from the superior
system you may use the MODBUS communication as an
option to control or monitor the equipment.
Input/output "MODBUS" (terminals 23+24)
The address for MODBUS communication is set using the
"SETTINGS" button. The setting procedure to be found in
paragraph 6.1.
MODBUS COMMUNICATION PARAMETERS
Serial line: 9.6 kbps, 8 bits, no parity, 1 stop bit
Station address: hex91 - hex9E (default hex91)
Supported functions
Fig.8 – MODBUS communication wiring diagram for
controlling multiple modules
READING REGISTRIES
Address
Name
(decadically)
VERSION
4096
ERROR
4097
TEMP1
4098
TEMP2
4099
DEFROST
4100
RECORDING REGISTRIES
Address
Name
(decadically)
POWER
4101
FUNCTION
4102
2020/07/23
- 3 (Multi_Read)
- 6 (Single_Write)
- 16 (Multi_Write)
Properties/description
Software version
Errors according to the device's self-diagnostics (see the service manual
of the LG device), (error 99 + Modbus communication error)
Refrigerant input temperature to the exchanger +15 °C (blue sensor,
smaller diameter)
Refrigerant output temperature to the exchanger +15 °C (red sensor,
bigger diameter)
1 = active defrost mode of the outdoor unit
Properties/description
The value of the required power 0 to 7 corresponds with analogue input
Bit 0
0 = cooling; 1 = heating (heat pump)
Power value 0,1,2,3 (this value is used to control the power only if
Bit 1+2
the value in the registry is = 0)
Bit 3
0 = OFF; 1 = ON
Bit 6
1 = RESET
I&C
page 13
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