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Serial Communications Section 6-3

PLC Setup

Note Set the baud rate to 115,200 bps when making settings with the CX-Program-

mer.

PT System Menu Set the PT as follows:

1,2,3... 1. Select NT Link (1:N) from Comm. A Method or Comm. B Method on the

Memory Switch Menu under the System Menu on the PT Unit.

2. Press the SET Touch Switch to set the Comm. Speed to High Speed.

6-3-4 Serial PLC Links (CJ1M CPU Units Only)

Overview

Serial PLC Links are supported by CJ1M CPU Units only. They allow data to

be exchanged among CJ1M CPU Units via the built-in RS-232C ports without

requiring special programming. Words are allocated in memory in the Serial

PLC Link Words (CIO 3100 to CIO 3199). RS-232C connections can be used

between CPU Units, or RS-422A/485 connections can be used by connecting

RS-232C-to-RS-422A/485 converters to the RS-232C ports. CJ1W-CIF11

RS-422A Converters can be used to convert between RS-232C and RS-

422A/485.

A PT that is set for NT Link (1:N) communications can also be used together

on the same network. The polled PT uses the network to communicate in an

NT link (1:N) with the polling CPU Unit. When a PT is connected, however, the

addresses in the Serial PLC Link Words corresponding to the PT’s unit num-

ber are undefined.

Communications

port

Programming

Console setting

address

Name Settings

contents

Default values Other conditions

Peripheral port 144

Bits: 8 to 11

Serial communica-

tions mode

02 Hex: NT Link

(1:N mode)

00 Hex: Host Link Turn ON pin 4 on

the CPU Unit DIP

switch.

145

Bits: 0 to 7

Baud rate 00 to 09 Hex:

Standard NT Link

0A Hex: High-

speed NT Link

(see note 1)

00 Hex: Standard

NT Link

150

Bits: 0 to 3

NT Link mode

maximum unit

number

0 to 7 Hex 0 Hex (Max. unit

No. 0)

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RS-232C port 160