Unisys E-@CTION EFP9800 - Manual (Page 226)

EF4270 Emulation Commands
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Printer Status Commands
These commands enable the printer to communicate its status to the host
computer.
The commands are listed numerically by hexadecimal code.
Status: 3 Bit
Transmits the status of the paper sensors and the condition of the printer. This
command is processed immediately.
Hexadecimal Decimal ASCII
05 03 5 3 ENQ ETX
The transmitted status is shown in the table:
Bit 0 1
0 Form Present Form Not Present
1 Paper Present Paper Not Present
2 Printer Is On-Line Fault Condition
Note: This command provides compatibility with earlier model printers. It
is generally not used for new applications. See the Status: 6 Bit
command (1B 05) for the more generally used command.