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The host should wait for any reponse before sending further
data. If the host sends data to the printer before the printer
responds to a request, the printer will cancel the reponse by
sending a carriage return with no data to the host. It then
processes the new data.
Exception Packets
This section describes exception packets, including their
syntax.
Syntax
{E,"#,[message]" }
E
is a constant, indicating that the data stream is an
exception packet.
# A code indicating what the printer should do. Values are
as follows:
0 Print message on line 1 of the display.
1 Provide input.
2 Print message on line 1 of the display and provide input.
3 Sound a tone.
4 Print message on line 1 of the display and sound a tone.
5 Sound a tone and provide input.
6 Print message on line 1 of the display, sound a tone,
and provide input.
message
A message used to perform the action specified in #. It
cannot be more than 15 characters long. Use message
only with actions 0, 2, 4, and 6. If you specify message
with actions 1, 3, or 5, the printer will ignore it.
Example
{E,"2,Scan bar code" }
This example displays Scan bar code on line 1 of the printer
display and enables the printer operator to provide input to the
host.
Printer Status Codes
The printer sends one of the following return codes to the host
after receiving a packet
Online Information
11. Online Information
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