M-S Cash Drawer 7193 - Manual (Page 93)

Commands 7193 Owner’s Guide
May 1996 90
Busy Line and Fault Conditions
An additional improvement is made in the way the 7193 RS-232C handles the
busy line (or busy condition when using XON/XOFF) during a fault condition.
Before this improvement, the printer would go busy at the RS-232C interface
when the receipt door was opened or the paper was exhausted as soon as it
received the next input byte. Bytes would continue to be accepted until the buffer
was full or the condition was cleared, but would stop processing data out of the
receive buffer. This resulted in the printer being unable to respond to the batch
mode status commands (ESC v and ESC u), or handle the cash drawer
commands even when it was not printing.
The improvement overcomes this limitation by not going busy at the RS-232C
interface until it attempts to process a command out of the receive buffer which it
can't do: for example, print on the receipt when it's out of paper. It will stay busy
and stop processing data out of the receive buffer until the condition clears.
Now if the cover is open or the paper is exhausted, the 7193 printer will still
accept data, respond to the batch mode status commands (ESC v and ESC u),
handle the cash drawer commands, and not go busy until it actually tries to
execute a print command. Then it will stay busy and stop processing data out of
the receive buffer until the condition clears. It will respond to the Real Time
commands as described below.
The only potential backward compatibility issue is if some application expects the
7193 to go busy when it processes a batch mode status command, which it now
won't. To handle this case, there is now a parameter setup in NVRAM to have the
printer handle the busy line the old way. The default will be the new way, but the
printer can be programmed in the field if it proves to be a problem.
To program the printer to handle the busy line the old way do the following
steps:
1. Record the current switch settings for their RS-232C parameters.
2. Set switches 2 and 3 to OFF, and set switches 1, 4, 5, and 6 to ON.
3. Power cycle the printer.
4. Wait until the printer beeps to store the parameter change in NVRAM.
5. Restore the switches to their RS-232C parameters.
6. Power cycle the printer.
7. Print out the diagnostics to be sure that the busy line parameter changed.