LG RCAW Operation & Maintenance Manual page 28

Controls
Connector
CN6
(RTDI)
MODBUS
The MODBUS communication capability is provided by standard. Using the MODBUS communication, the chiller can be
integrated in conventional BMS network. The MODBUS also can be translated to LonWorks or BACnet using 3rd party
translator for flexible connectivity to BMS network. The communication configuration of the MODBUS communication is
as following:
1) Signal: RS-485
2) Mode: RTU
3) Baud rate: 19,200BPS
4) Parity: even
5) Character: 8 Bit
6) Stop Bit: 2 Bit
28 Chiller Air-cooled Screw
Pin Wire No.
11
RTD1+
RTD1- 10
-
RTD1-
RTD2+
13
RTD2-
12
-
RTD2-
15
RTD3+
RTD3- 14
-
RTD3-
17
RTD4+
16
RTD4-
-
RTD4-
19
RTD5+
18
RTD5-
-
RTD5-
-
RX2/D2+
-
TX2/D2 -
Description
Chilled Water In Temperature
-
Chilled Water Out Temperature
-
Compressor Exhaust Temperature
-
Ambient Temperature
-
Refrigerant Cond Out Temperature
-
MODBUS on RS -485: D+
MODBUS on RS - 485: D -
Table 7