Xerox 3270 Manual do programador - Página 15

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3270 Programmer's Guide

Function Selection via the Line

NOTE:

In command strings in hex pair notation, only the

hexadecimal characters 0-9 and A-F are allowed. The

specifying of any other character may give unpredict-

able printing results.

Between the two leading and the trailing ESC characters all IBM

control codes, spaces, and the character "," will be ignored by the

converter. They may be inserted in command strings to facilitate the

reading of the datastream.

2.3. Apostrophe Notation

Another way of sending printer commands strings is to use the

apostrophe notation. Apostrophes tell the converter that the

characters following should be regarded as ASCII characters in the

commands. Below you can see an example of this.

Structure of a command with the apostrophe notation

The above example shows the command code 1B (HEX) combined

with the apostrophe notation.

The apostrophe notation can only be used in connection with trans-

mission of characters in the LU3 character table. All IBM control

codes are ignored in command strings.

To ensure correct processing of the data, all spaces in the string

must be sent as the hexadecimal value (HEX 20). If e.g. you wish to

transmit "270 C/RS" the sequence should be sent as shown in the

following:

Syntax of a command with a blank sent in apostrophe notation

%%1B '\12'%

&&??%

Define temporary escape

%%''270'20'C/RS'%

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