HP LaserJet 9000 Printer series - Manual (Page 210)

Appendix D Printer commands 210
Understanding PCL 5e printer command syntax
2 When combining escape sequences, change the uppercase (termination) character in each individual
escape sequence to lower case.
3 The final character of the combined escape sequence must be uppercase.
The following is an example of an escape sequence string that would be sent to the printer to select legal
paper, landscape orientation, and eight lines per inch:
Ec&l3AEc&l1OEc&l8D
The following escape sequence sends the same printer commands by combining them into a shor ter
sequence:
Ec&l3a1o8D