HP LaserJet 9000 HP LaserJet 9000 series printer User Guide - Page 209

Appendix D Printer commands 209 Understanding PCL 5e printer command syntax Before using printer commands, compare these characters: Lowercase l: l Number one: 1 Uppercase O: O Number 0: 0 Many printer commands use the lowercase letter l (l) and the number one (1), or the uppercase letter O (O) and the number zero (0). These characters may not appear on your screen as shown here. You must use the exact character and case specified for PCL 5e printer commands. Escape character (begins escape sequence) Value field (contains both alpha and numeric characters) Parameterized character Group character Termination character (uppercase) Combining escape sequences Escape sequences may be combined into one escape sequence string. There are three important rules to follow when combining code: 1 The first two characters after the escape character (the parameterized and group characters) must be the same in all of the commands to be combined. Understanding PCL 5e printer command syntax