Axiohm 7156 Spezifikationen Seite 117

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7156 Owner’s Guide Commands
October 1995 109
Real Time Commands
These commands correct difficulties with the original version of the 7156 RS-232C
communication interface:
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.
The Real Time commands are implemented in two ways to correct these
problems. Both implementations offer the same functionality; which one you
choose depends on the current usage of your application. For a new application
the GS sequences of the first implementation are recommended to avoid possible
misinterpretation of a DLE sequence as a Clear Printer (10 0—DLE NUL)
command.
The first implementation builds upon the GS ENQ sequence as implemented on
Epson’s TM-930II™, TM-950™ and TM-U950™ by defining two new GS (0x1D)
sequences to provide the same functions as the DLE sequences above, and to
provide complete backward compatibility to the original 7156 Clear Printer
command.
An application using these GS sequences does not need to distinguish for the
printer between the new real time commands and the old Clear Printer
command. This implementation is ideal for an existing 7156 application which
already uses the Clear Printer command or for a new application being
developed.
The alternate implementation uses the DLE (0x10) sequences as implemented on
Epson’s TM-T85™ and TM-U950™. An application using these DLE sequences
and the original 7156 Clear Printer command (0x10) must distinguish for the
printer between the new real time commands and the old Clear Printer command
by adding a NUL (0x00) to the Clear Printer command.
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