StarTech.com IC485S Installation Manual page 6

5
Multidrop/2-Wire
Half Duplex
A
T+
T-
=>
PC1
R-
COM1/
R+
COM2
IC485S
Configuration
Device SW1
A DCE/DTE
B DCE/DTE
B1
R+
R-
=>
PC2
T-
COM1/
T+
COM2
IC485S
B2
R+
R-
=>
PC3
T-
COM1/
T+
COM2
IC485S
B3
R+
R-
=>
PC4
T-
COM1/
T+
COM2
IC485S
SW2
TxRTS, RxRTS
TxRTS, RxRTS
Simplex/Transmit, Receive Only
Simplex configuration means that more than two devices can be linked all together to
communicate through many IC485S / GB / EU devices. Its configuration is like the
Multidrop's, but the master device can talk only and the slave devices can listen only.
A
Simplex/Transmit,
Receive Only
T+
=>
PC1
COM1/
R+
COM2
IC485S
Configuration
Device SW1
A DCE/DTE
B DCE/DTE
Note: Bn means any one of the B1, B2, B3 and so on.
B1
R+
T- R-
=>
PC2
R- T-
COM1/
T+
COM2
IC485S
B2
R+
R-
=>
PC3
T-
COM1/
T+
COM2
IC485S
B3
R+
R-
=>
PC4
T-
COM1/
T+
COM2
IC485S
SW2
TxON, RxON
TxON, RxON
6