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3-3

IM DR231-11E

Overview and Specifications of RS-422-A/RS-485 Interface

3.3 RS-422-A/RS-485 Interface Connection

The following explains how the RS-422-A/RS-485 module is connected to the computer.

Cable Used

There are two types of cables: two-wire cable and four-wire cable. Make sure each type meets the

following conditions.

Cable used : twisted pair shielded cable

2 pairs of 24 AWG minimum (two-wire), 3 pairs 24 AWG mini-

mum (four-wire)

Characteristic impedance : 100 ohm

Capacitance : 50 pF/m

Length of cable : 1.2 km maximum *

* Communication distance of the RS-422-A/RS-485 interface is not the linear distance, but the

total length of the cable (shielded twisted pair cable).

Terminal Arrangement of the RS-422-A/RS-485 Module

RD A Receive data A ( - )

RD B Receive data B ( + )

FG Frame ground

SD A Send data A ( - )

SD B Send data B ( + )

SG Signal ground

Screws used for the terminals:

ISO M4 screws, length 6 mm

Connecting the Cable

Attach crimp-on lugs (for 4 mm screws) with insulation sleeves on the leadwire ends as shown in the

diagram below. Make the exposed portion of the shielded cable to be less than 5 cm.

SD/RD A

SD/RD B

Shield potential

For two-wire system

For four-wire system

SD A

SD B

RD B

RD A

Shield

potential

Short the terminals.

<07. W Title> WARNING

To prevent an electric shock, ensure the main power supply is turned OFF.

Note

• As shown on the next page, connect terminal RD to SD(TD) of the computer (converter) and terminal SD to RD of the

computer.

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