LG RS 485 User Manual page 7

4.2.
RS232-485 converter installation
See the converter manual for accurate installation.
4.3.
Computer, Converter and RS485 Option Card Configuration
4.3.1.
System configuration
Maximum cable length is 1200m but recommended length is within 700.
The number of connectable inverter is 31.
Computer
4.3.2.
Communication signal connection
Pin
Description
* S: Networkd line ground shoud be done only one point.
Connect it to screw near terminal shield when grounding through inverter.
* GND: Ground terminal for 485 communication
* T1, T2: Shorting these terminals connects a terminating resistor.
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232/485
Option card
Converter
Inverter 1
Figure 2. System configuration
S GND T2
Figure 3. Option card terminal layout
S GND
Shield Ground
Option card
Inverter 2
T1
N P
T1 T2
Termination
5
...
Option card
Inverter n
N P
Signal