ATEN Interface Converter IC-485SI Instruction Manual download pdf (Page 11)

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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.

1. Multidrop 4 Wire Full Duplex

 Multidrop Full Duplex uses reverse four wire cabling to link

all the connected IC-485S / IC-485SI units:

 For all 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 the Master unit, set SW2 to TxON, RxON.

 For all Slave units, set SW2 to TxRTS, RxON.

Master

T+

R+

Slave 1

R+

R -

T -

T+

Slave 2

R+

R -

T -

T+

Slave 31

PC1

COM1/

COM2

PC2

COM1/

COM2

PC3

COM1/

COM2

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ATEN Interface Converter IC-485SI Instruction Manual Page 11