ATEN RS-485 User Manual download pdf (Page 5)

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For both IC-485S / IC-485SI units, set SW1 to DCE or DTE depending on what type of

device the IC-485S / IC-485SI will plug into (if it will plug into a DCE device, configure it

for DTE, and vice versa).

For both IC-485S / IC-485SI units, set SW2 to TxON, RxON.

Point-to-Point 4 Wire Half Duplex

Point-to-Point Half Duplex uses straight through four wire cabling, as shown in the

diagram below.

For both IC-485S / IC-485SI units, set SW1 to DCE or DTE depending on what type of

device the IC-485S / IC-485SI will plug into (if it will plug into a DCE device, configure it

for DTE, and vice versa).

For both IC-485S / IC-485SI units, set SW2 to TxRTS, RxRTS.

Multidrop

A Multidrop configuration is one in which more than two devices are linked for communication using

several IC-485S / IC-485SI units.

One of the devices that one of the IC-485S / IC-485SIs connects to is designated as the Master

device. All the remaining devices that the rest of the IC-485S / IC-485SIs connect to are designated as

Slave devices. There are two configurations: Multidrop Full Duplex, and Multidrop Half Duplex.

Multidrop 4 Wire Full Duplex

Multidrop Full Duplex uses reverse four wire cabling to link all the connected IC-485S /

IC-485SI units:

1 2 3 4 5 6 7 8 9 10

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ATEN RS-485 User Manual Page 5