2020/07/23 page 13
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 - 3 (Multi_Read)
- 6 (Single_Write)
- 16 (Multi_Write)
Fig.8 – MODBUS communication wiring diagram for
controlling multiple modules
READING REGISTRIES
Name
Address
(decadically) Properties/description
VERSION
4096
Software version
ERROR
4097
Errors according to the device’s self-diagnostics (see the service manual
of the LG device), (error 99 + Modbus communication error)
TEMP1
4098
Refrigerant input temperature to the exc15 °C (blue sensor,
smaller diameter)
TEMP2
4099
Refrigerant output temperature to the exc15 °C (red sensor,
bigger diameter)
DEFROST 4100
1 = active defrost mode of the outdoor unit
RECORDING REGISTRIES
Name
Address
(decadically)
Properties/description
POWER
4101
The value of the required power 0 to 7 corresponds with analogue input
FUNCTION 4102
Bit 0
0 = cooling; 1 = heating (heat pump)
Bit 1+2
Power value 0,1,2,3 (this value is used to control the power only if
the value in the registry is = 0)
Bit 3
0 = OFF; 1 = ON
Bit 6
1 = RESET
I&C