Epson A794-D100 - Manual (Page 93)

A794 Owner’s Guide Chapter 6: Programming Information
March 1999 87
Printer Status Commands
These commands enable the printer to communicate with the host computer following
the selected handshaking protocol, either DTR/DSR or XON/XOFF. They are stored in
the printer's data buffer as they are received, and are handled by the firmware in the
order in which they were received.
When a fault occurs, the printer will go busy at the RS-232C interface and not respond
to either of the Printer Status commands. If the fault causing the busy condition can be
cleared, such as by loading paper, or letting the thermal printhead cool down, the
printer will resume processing the data in its receive buffer.
Real Time commands allow the printer to function when it is busy at the RS-232C
interface. See the following section, Real Time Commands, for details about these
commands.