StarTech.com IC485SEU User Manual
Page 6
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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.
Note: Bn means any one of the B1, B2, B3 and so on.
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
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
TxON, RxON
TxON, RxON
Multidrop/2-Wire
Half Duplex
Configuration
Simplex/Transmit,
Receive Only
Configuration