Omron NT631C manual Connecting to the Host’s RS-232C Port

Connecting to the Host’s RS-232C Port Section 5-1

5-1 Connecting to the Host’s RS-232C Port

The methods for connecting the RS-422A/485 port of the NT631/NT631C and the RS-232C port of the host are described here. There are the following methods.

The following discussion is focused on the connection method to OMRON PLCs (By using the memory link method, a connection can be made to any arbitrary RS-232 unit). When making a connection to a host other than OMRON PLCs, refer to the PLC Connection Manual (V042-E1-@) or NT31/ 631 Multi Vendor Connection Manual (V060-E1-@).

•Method in which the RS-422A port of the NT631/NT631C and the RS- 232C port of the host are connected in a 1:1 connection via an RS-232C/ RS-422A Adapter (page 82).

When this method is used, the cable length can be extended up to 500 m.

PT	RS-232C/RS-422A	Host
	convertor unit

RS-422A cable (max. 500 m)

RS-232C cable (max. 2 m)

•Method in which the RS-485 port of the NT631/NT631C and the RS-232C port of the host are connected in a 1:1 connection via an RS-232C/RS- 422A Adapter (page 82).

When this method is used, the cable length can be extended up to 500 m. This connection method can be used only with the NT Link (1:N) method of type RS-485.

PT	RS-232C/RS-422A	Host
	convertor unit

RS-485 cable (max. 500 m)

RS-232C cable (max. 2 m)

•Method in which the RS-422Aports of multiple NT631/NT631Cs and the RS-232C port of the host are connected in a 1:N connection via an RS- 232C/RS-422A Adapter (page 86).

This connection method is used with the RS-422A NT Link (1:N) meth- od.

PT	RS-232C/RS422A		Host
	convertor unit
		RS-232C
	RS-422A cable
		cable
	(max. total length	(max. 2 m)

500m)

•Method in which the RS-485ports of multiple NT631/NT631Cs and the RS-232C port of the host are connected in a 1:N connection via an RS- 232C/RS-422A Adapter (page 86).

This connection method is used with the RS-485 NT Link (1:N) method (standard or high-speed).

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