IBM 4400 manual Attribute Set and Reset Codes, Command Line Error Messages Explanation

Command Line

Command Line

Print format, print mode, or international language selection can be controlled by a longer sequence known as a Command Line. Command Lines are string type commands placed between complete lines of text and affect the text which follows. The protocol has six Command Lines: PMODE, OSET, PSET, LPI, LINES, and INCHES. Each of these Command Lines is discussed in this chapter under the appropriate Control Code function.

For example, the form length (in inches) can be set using the following command line:

SFCC INCHES;n.f

where: n is the whole number of inches, and f is the fractional increment in 0.5 inch increments.

When using the SFCC in a Command Line, the SFCC must be the first non- blank symbol in the line (space, hex 20, is a blank symbol). In addition, characters following spaces (other than a valid line terminator) in a Command Line are ignored so that user comments can be included on the Command Line. The valid line terminators are Form Feed (FF), Line Feed (LF), and Carriage Return (CR); however, when used in the Command Line, these line terminators do not cause any paper motion. If a Command Line contains an error, the command is not executed, and the line truncates to include any of the error messages listed in the following table:

Table 2. Command Line Error Messages

Error Message	Explanation
Invalid Parameter	The command received cannot be
	interpreted correctly, or the correct command
	is not followed by an expected delimiter.
Parameter Out of Bounds	A decimal parameter in the command is out
	of range.
Missing Parameter	One or more necessary parameters is
	missing from the command.
Illegal Character in Decimal	A decimal parameter contains a non-numeric
Parameter	character, or a fractional digit is out of range.
Too Many Digits in Decimal	A decimal parameter contains too many
Parameter	digits.

Attribute Set and Reset Codes

Certain print attributes are set and reset (turned on or off) by using the appropriate SFCC code sequence and the numbers 1 or 0. These may be either the hexadecimal code 01 and 00, or the ASCII code for the printable symbols of decimal 1 and 0 (hexadecimal code 31 and 30, respectively). Expanded Print, Superscript/Subscript Print, and Underline are attributes that are set and reset this way.

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