Xerox 3270 manual

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 unpredictable 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. %%1B '\12'% 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 transmission 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: &&??% Define temporary escape %%''270'20'C/RS'% Syntax of a command with a blank sent in apostrophe notation - 15 -