LG multi V ARUM Series - MODBUS Communication; Modules Wiring Diagram While Using MODBUS Protocol (Fig. 6)

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.
PARAMETRY KOMUNIKACE MODBUS
Serial line: 9.6 kbps, 8 bits, no parity, 1 stop bit
Station address: hex91 - hexA7 (default hex91)
Supported functions: - 3 (Multi_Read)
- 6 (Single_Write)
- 16 (Multi_Write)
Fig.6 - 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 exchanger +15 °C (blue sensor, smaller
diameter)
TEMP2
4099
Refrigerant output temperature to the exchanger +15 °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 POWER is = 0)
Bit 3
0 = OFF; 1 = ON
Bit 6
1 = RESET
I&C