LG MASTER-K 120S Series User Manual page 194

Chapter 8 Communication Functions
.
(3) 1:1 connection with other MASTER-K120S
RS-485 interface
5
4
3
2
1
Male Type
MASTER-K120S main unit
MASTER-K120S
main unit
Pin no.
1
2
9
3
8
7 4
6
5
6
7
8
9
MASTER-K120S main unit Connection method and signal direction
485+
485-
MASTER-K120S main unit
RS-232C interface
Pin assignment and direction
8-4
MASTER-K120S main unit
Pin no. Signal
1 5V
2 RXD1
3 TXD1
4 RXD2
5 SG
6 5V
7 TXD2
8 SG
9 SG
MASTER-K120S main unit
485+
485-