5
6
PC1
COM1/
COM2
T+
T-
R-
R+
IC485S
=>
A
PC2
COM1/
COM2
R+
R-
T-
T+
IC485S
=>
PC3
COM1/
COM2
=>
PC4
COM1/
COM2
=>
B1
R+
R-
T-
T+
IC485S
B2
R+
R-
T-
T+
IC485S
B3
Device
A
B
SW1
DCE/DTE
DCE/DTE
SW2
TxRTS, RxRTS
TxRTS, RxRTS
Multidrop/2-Wire
Half Duplex
Configuration
