HP 24SII - Manual (Page 74)

This command should be entered in all capitals with only one space
between ECHO and the $. Please refer to you DOS manual for
instructions on creating DOS batch files.
Programs such as Word Perfect and WordStar typically send a printer
initialization string before any data. The port select sequence may
also be embedded in this string to select a printer. For example,
Word Perfect allows you to edit the printer definition file for a specific
printer by using the PTR command. The port select sequence for the
Model 24SII DES would typically be inserted prior to any escape
codes for the printer. Please see the documentation for your
application package(s) for more information on editing printer
initialization strings.
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If you have a HP 3000 mini computer, you should contact a BayTech
sales representative to order option #26. When the HP 3000 sends an
HP LaserJet inquiry command, the Model 24SII DES will then respond
with the required ASCII 0 (30 hex).
This option is compatible with all other computer systems.