Omron NT631C manual Type of Host and Settings, Settings at the RS-232C RS-422A Adapter NT AL001

Connecting to the Host’s RS-232C Port					Section 5-1
	PT	RS-232C/RS422A		Host
		convertor unit
		RS-485 cable	RS-232C
		(max. total length	cable
		500 m)	(max. 2 m)

Note One end of the wire must always be connected to the host (PLC), and there must be no branching. Branching will cause problems such as transmission delays and communications failures.

	PLC	(At termination)
					Relay terminal block
						Max. 2 m
	NT631C		NT631	NT631			NT631
(Not at			(Not at				(At
termination)			termination) (Not at				termination)
				termination)

Example of Good Connection

NT631

PLC PLC

Relay terminal block

NT631C		NT631	NT631	NT631C	NT631
	Examples of Bad Connections

Reference: CS/CJ-series CPU Units cannot be connected with the 1:1 connection NT Link method. Use the 1:N connection NT Link method (standard or high- speed) instead to make the 1:1 connection. For details, refer to Using the NT Link (1:N) Method (page 65) or Using the High-speed NT Link (1:N) Method (page 70).

5-1-1 The Type of Host and Settings

The using condition is the same as the connecting PT side RS-232C and the host side RS-232C.

For the available type and settings of the host, refer to the pages listed below.

Method	Reference
Host link	Host Link Method (page 48)
NT Link (1:1)	NT Link (1:1) method (page 61)
NT Link (1:N)	Using the NT Link (1:N) Method (page 65)
High-speed NT Link (1:N)	Using the High-speed NT Link (1:N) Method (page 70)
Memory link	Memory Link Method (page 73)

Settings at the RS-232C/

RS-422A Adapter (NT-

AL001)

When making a connection between RS-232C and RS-422A/485 ports using an RS-232C/RS-422A Adapter, set the DIP switches on the NT-AL001 as fol- lows.

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