NCR 7156, Owner'S Manual, Page: 96 / 138

Chapter 6: Commands 7156 Owner’s Guide
September 1997 90
0 There is no more printing space on the current slip, or
the slip paper is not selected.
1 to 8
•
Remaining print area on the current slip, in number
of lines, at the currently set line spacing, when the
trailing edge sensor has become uncovered.
•
Until the trailing edge sensor becomes uncovered the
value reported will be 6, because there are at least 6
lines remaining.
•
There can be 7 or 8 lines remaining when the slip line
spacing has been set to less than 7.2 lines per inch.
Real Time Commands
These commands provide an application interface to the printer even when the printer is
not handling other commands (RS-232C communication interface only):
•
Real Time Status Transmission (GS Sequence and DLE Sequence)
•
Real Time Request to Printer (GS Sequence and DLE Sequence)
•
Real Time Printer Status Transmission
The original Printer Status commands, Transmit Printer Status (1B 76—ESC v) and
Transmit Cash Drawer Status (1B 75 0—ESC u 0)
are placed in the printer’s data buffer as
they are received and handled by the firmware in the order in which they were received. If
the paper exhausts while printing data which was in the buffer ahead of the status
command, the printer goes busy at the RS-232C interface and suspends processing the data
in the buffer until paper is reloaded. This is true for all error conditions: knife home error,
slip paper jam, thermal printhead overheat, etc.
In addition, there is no way to restart the printer after a paper jam, or to cancel a slip
waiting condition when using the Wait for Slip (ESC c 0 0x04) command.