Omron NT31 NT31C 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 NT31/NT31C 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 PCs (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 PCs, re- fer to the PC Connection Manual (V042-E1-j) or NT31/631 Multi Vendor Con- nection Manual (V060-E1-j).

•Method in which the RS-422A port of the NT31/NT31C and the RS-232C port of the host are connected in a 1:1 connection via an RS-232C/RS-422A con- vertor unit (page 88).

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 NT31/NT31C and the RS-232C port of the host are connected in a 1:1 connection via an RS-232C/RS-422A conver- tor unit (page 88).

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-422A ports of multiple NT31/NT31Cs and the RS-232C port of the host are connected in a 1:N connection via an RS-232C/RS-422A convertor unit (page 92).

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

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

•Method in which the RS-485 ports of multiple NT31/NT31Cs and the RS-232C port of the host are connected in a 1:N connection via an RS-232C/RS-422A convertor unit (page 92).

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

PT	RS-232C/RS422A		Host
	convertor unit
	RS-485 cable	RS-232C
	(max. total length	cable
	500 m)	(max. 2 m)

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