Omron NT31 NT31C Communications with the Host, Connecting to the Host, Direct Connection Function

Communications with the Host		Section 1-4
Reference: The following optional devices are available. All of them can be used either with
	NT31 or NT31C.
	Replacement backlight	NT31C-CFL01
	Reflection-suppressing protective sheet NT30-KBA04
	Chemical-resistant cover	NT30-KBA01
	Replacement battery	3G2A9-BAT08

1-3-2 Connecting to the Host

The NT31/NT31C has the following two communication ports.

•Serial port A:

D-SUB 9-pin connector

For RS-232C use only (The Support Tool and bar code readers can be con- nected here.)

•Serial port B:

D-SUB 25-pin connector

For RS-232C or RS-422A/485 (Selectable by memory switch)

(The Support Tool and bar code readers cannot be connected here.) The host can be connected at either of these two ports.

The connection methods for each communication method at the PT and host sides are indicated below. Make the settings in accordance with the communica- tion method that can be used with the PC to be connected and the conditions at the operation site.

Reference: When using an RS-232C/422A convertor unit (NT-AL001) with the host link or NT link (1:1) communication method, RS-485 cannot be used. The connection must be made with RS-232C or RS-422A.

1-4 Communications with the Host

The NT31/NT31C is connected to the host by one of the following communica- tion methods.

The following communications can be used to connect an OMRON PC:

•Host link

•1:1 NT Link

•1:N NT Link (standard or high-speed)

The following communications can be used to connect another companies’ PC or FA computer:

•Communications protocol supported by the other company’s PC

•Memory link

In all of these communication methods that can be used with NT31/NT31C, data communication with host is by direct connection (Memory link is, however, a quasi-direct connection).

In the following, the host link and NT link that carry out the direct connection will be discussed. Memory links will be explained in 1-5 Communications Using Memory Links.

1-4-1 Direct Connection Function

With the NT31/NT31C, the bits and words referring to data required for display, and those for storing input data, can be allocated to any part of the PC memory area.

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