Omron NT631C manual Direct Connection between RS-422A Ports at Both Units

Connecting to the Host’s RS-422A/485 Port Section 5-2

The following are the communications conditions that can be used with 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	Setting at Host
Input/Output board	RS-422A
Communications speed	1200, 2400, 4800, 9600, 19200, 38400 bps.
Data bits length	7 bits, 8 bits
Stop bits length	1 bit, 2 bits
Parity	None, even, odd
Flow control	None, XON/XOFF

5-2-2 Direct Connection between RS-422A Ports at Both Units

The connection method in which the RS-422A ports of an NT631/NT631C and a host are connected is described here.

NT631/NT631C

RESET

RDA

TRM

RDB

SDA

SDB

CSA

CSB

24V	PR I NTER PORT B PORT A
+DC

Serial port B (RS-422A/485, terminal block)

Host Link Unit, CPU Unit,

Communications Unit/Board

SYSMAC

CS/CJ-series PLC,

C-series PLC,

CVM1/CV series

PLC, SRM1

9-pin connector or

25-pin connector

RS-422A cable with connectors (max. length: 500 m)

Connecting an NT631/NT631C and Host (RS-422A)

NT631/NT631C Host

RS-422A

Wiring When Connecting a C-series Host Link Unit or CPM1 (Host Link)

Applicable Units:

C200H-LK202-V1 3G2A5-LK201-EV1

C500-LK203

3G2A6-LK202-EV1

RDA NT631/NT631C side

PLC side

16

TRM

RDB

SDA

SDB

RSA

RSB

RS-422A/ 485 terminal block

Abbreviation Short-circuit tool
	Shielding wire
RDA (-)

TRM

RDB (+)

SDA (-)

SDB (+)

RSA (-)

RSB (+)

Functional ground

Pin number Abbreviation

Connector	FG
hood

1RDB (+)

2− RS-422A terminal

3 SG block

4−

5SDB (+)

6RDA (-)

7FG

8−

9	Functional
	ground

24V

+DC

(9-pin type)

59

For details on handling shield wires, refer to 5-2-8 Handling the Shield on RS- 422A/485 Cables on page 125.

115