Omron NT631C Connecting Directly between RS-232C Ports, When Using the Memory Link Method

Connecting to the RS-232C Port at the Host Section 4-1

When Using the Memory Link Method

Word m = DM30000 + (100 ⋅ unit number)

Allocated DM Area words		Setting	Setting Contents
Port 1	Port 2
m	m+10	8200	1:N NT Link Mode
m+1	m+11	000A	Baud rate (standard)
m+6	m+16	000@	@ = The highest unit number of the con-
			nected PTs (0 to 7)

In the memory link method, the connection can be made to a personal com- puter with RS-232 and an FA computer, etc.

When connecting to the host in the memory link method, it is necessary to create a program for the memory link at the host side.

The following are the communications conditions that can be used in the memory link method. For the host (a personal computer, an FA computer, etc.), its setting should be compatible to one of the communications condi- tions listed in the following table. Set the same communications conditions at the NT631/NT631C by the memory switch. (page 160).

Item	Settings at the host
Input/Output port	RS-232C
Communications speed	1200, 2400, 4800, 9600, 19200, 38400 bps.
Data bits length	7 bits, 8 bits
Stop bits length	1 bits, 2 bits
Parity	None, even, odd
Flow control	None, RS/CS, XON/XOFF

4-1-2 Connecting Directly between RS-232C Ports

The method for connection between the RS-232C ports of the NT631/

NT631C and the host is described here.

Host Link Unit or CPU Unit

NT631/NT631C

RESET
RD
TRM
RDB
SDA
SDB
CSA
CSB
24V	PR I NTER PORT B PORT A
+DC

9-pin connector

Serial port A or B (RS-232C, 9-pin type)

Cable with RS-232C connectors

SYSMAC

CS/CJ-series PLC,

C-series PLC,

CVM1/CV-series PLC,

SRM1

9-pin connector or

25-pin connector

Recommended Connector Cable

When making the connector cable, as far as possible use the recommended connectors, connector hoods, and cables indicated in the table below. Some Units come supplied with one connector and one connector hood.

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