This Printer Returns A ? For Inquiries Of An Unsupported Variable, Or Inquiries Of A Variable Associated With An Option That Is Not Installed; Ustatus Command - Lexmark Printer User Manual

The supported variables are listed in the tables beginning on page 3-12.
This printer returns a ? for inquiries of an unsupported variable, or inquiries of a
variable associated with an option that is not installed.

USTATUS Command

This command is used to enable and disable unsolicited status from the printer.
Unsolicited status information is sent automatically when an asynchronous event
occurs. "Table 3-11: USTATUS Unsolicited Status Variable Values" on page 3-60 lists
the asynchronous information that can be enabled and disabled.
Syntax:
Response Syntax:
To determine which variables your printer supports, see "Table B-9: USTATUS
Unsolicited Status Variables" on page B-13.
See "Status Message Format" on page 3-61 for additional information about the
messages returned by the INFO STATUS, USTATUS DEVICE, and USTATUS TIMED
commands.
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PJL