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RS-422/485 Connector diagram

Four-Wire Conguration

Four-wire Systems utilize separate transmit and receive wires. One pair of wires must connect the host’s transmit signals to

each drive’s RX+ and RX- terminals. e other pair connects the drive’s TX+ and TX- terminals to the host’s receive signals.

A logic ground terminal is provided on each drive and can be used to keep all drives at the same ground potential.

is terminal connects internally to the DC power supply return (V-), so if all the drives on the RS-422/485 network are

powered from the same supply it is not necessary to connect the logic grounds. One drive’s GND terminal should still be

connected to the host computer ground.

RS-422/485 4–wire system

NOTE: a 120 ohm terminating resistor is required at the end of a four wire network.

NOTE: If the PC does not have an RS-422/485 serial port, a converter will be required.

GND (circuit ground)

TX+

RX+

+Rx- +Tx- GND +Rx- +Tx- GND +Rx- +Tx- GND

to Host Tx+

to Host Tx-

to Host Rx+

to Host Rx-

to Host GND

Drive 1 Drive 2 Drive n

120

STM17 Hardware Manual

920-0034 rev A

9/30/2010

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Applied-motion STM17C-3CE Bedienungsanleitung Seite 14