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Two-Wire Conguration

RS-422/485 Connector diagram

Transmit and receive on the same pair of wires can lead to trouble. e host must not only disable its transmier before

it can receive data, it must do so quickly, before a drive begins to answer a query. e STM23 includes a “transmit delay”

parameter that can be adjusted to compensate for a host that is slow to disable its transmier. is adjustment can be

made over the network using the TD command, or it can be set using the

ST Congurator

soware. It is not necessary to

set the transmit delay in a four-wire system.

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

RS-232 to RS-485 2-wire Converter

Model 485-25E from Integrity Instruments (800-450-2001) works well for converting your PC’s RS-232 port to RS-485.

It comes with everything you need. Connect the adaptor’s “B” pin to the Drive+Motor’s TX+ and RX+ terminals. Connect

“A” to the drive’s TX- and RX- terminals.

Assigning RS-485 Addresses

Before wiring the entire system, you’ll need to connect each drive individually to the host computer so that a unique

address can be assigned to each drive. Use the

ST Congurator™

soware, available at Applied Motion’s website for this

purpose.

Connect the drive to your PC and then launch the

ST Congurator™

soware. Finally, apply power to your drive. If you

have already congured your drive, then you should click the Upload buon so that the

ST Congurator™

seings match

those of your drive. Click on the Motion buon, then select the SCL operating mode. If you have a Q drive, you may

want to select “Q Programming”. Either way, you’ll see the RS-485 Address panel appear. Just click on the address charac-

ter of your choice. You can use the numerals 0..9 or the special characters ! “ # $ % & ‘ ( ) * + , - . / : ; < = > ? @ . Just make

Typical RS-422/485 Two-Wire System

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

to Host Tx+ (B)

to Host Tx- (A)

to Host GND

Drive 1 Drive 2 Drive n

120

GND

TX–

TX+

RX–

RX+

STM23 Hardware Manual

920-0021F

2/14/2012

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