ESCAPE SEQUENCE / CONTROL FUNCTION SYNTAX

Within PPL III, the overall description given to control codes, escape sequences and control strings is "commands." For consistence with the rest of this manual, separateness will be maintained.

Escape Sequence Syntax

Escape sequences have the following general format:

<ESC><I><F>

Final Character

Intermediate Characters

Escape Sequence Introducer

Example: ESC ( B

CSI: The ESC control character (1BH) is the escape sequence introducer.

I:Intermediate characters received after and ESC and should be in the range of 20H to 2FH. No more than 3 intermediate characters are permitted within PPL III. If four or more intermediate characters are received before the final character, the event is noted and the entire sequence is ignored.

F:A final character is in the range of 30H to 7EH. It indicates the end of an escape sequence. The intermediate characters (if any) and the final character, taken together, define the function of the sequence.

Control Sequence Syntax

Control sequences differ from escape sequences in that they have parameters that modify the function of the control sequence. The general format for a control

<CSI><P><I><F>

Final Character

Intermediate Characters

Parameters

Control Sequence Introducer

CSI: The control sequence introducer has a hex value of 9B. This is equivalent to a 7-bit escape sequence of ESC [ or 1BH 5BH. Both encodings are recognized as a CSI.

Parameters: Parameter characters are in the range of 30H to 3FH. A parameter modifies the action of the control sequence. Generally, parameters are ASCII digits and act as a numerical index in the sequence. Within PPL III, the occurrence of the "?" character (3FH) or

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5000 Series Programmer’s Manual

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Genicom GEK 00031B manual Escape Sequence / Control Function Syntax, Escape Sequence Syntax, Control Sequence Syntax, Escif

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