Omron NT31 NT31C manual Direct Connection between RS-422A Ports at Both Units

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

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

The following are the communication 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 communication conditions listed in the following table. Set the same communication conditions at the NT31/NT31C by the memory switch. (page 165).

Item	Setting at Host
Input/Output board	RS-422A
Communication 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 NT31/NT31C and a host are connected is described here.

	Host link/CPU/
NT31/NT31C	Communication unit
	SYSMAC
	CS1 series PLC,
	C series PLC,
	CVM1/CV series
	PLC, SRM1

25-pin

connector

Serial port B	9-pin connector or
(RS-422A, 25-pin type)	25-pin connector

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

Connecting an NT31/NT31C and Host (RS-422A)

NT31/NT31C Host

RS-422A

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

Applicable units:

C200H-LK202-V1 3G2A5-LK201-EV1

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