CognitiveTPG B780 - Manual (Page 103)

Chapter 5: Programming commands 91
A776-PG00001 C 12/09 A776 (B780) Programming Guide
To guard against this situation, the application must determine the cause of a busy condition and take appropriate
action or pace the real time commands to avoid filling the buffer. There is a minimum of 256 bytes available in the
printer’s buffer when it goes busy.
Busy line and fault conditions
If the printer is in error condition (cover is open, paper is exhausted…), the printer will still accept data, respond to the
batch mode status commands (1B 76 and 1B 75 0), 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.
Real-time status transmission
GS sequence DLE sequence
ASCII GS EOT n DLE EOT n
Hexadecimal 1D 04 n 10 04 n
Decimal 29 4 n 16 4 n
Value of n: GS/DLE sequence
1 = Transmit printer status
2 = Transmit RS-232C busy status
3 = Transmit error status
4 = Transmit receipt paper status
5 = Slip paper status
6 = Validation paper status
Transmits the selected one byte printer status specified by n command within a few msec according to the following
parameters. This command includes two sequences: GS (1D) and DLE (0×10).
Exceptions
The command is ignored if n is out of range.
An application using DLE (0×10) sequence must send EOT within 100 milliseconds of DLE or the printer will
misinterpret the DLE and execute a clear printer command. Avoid this possibility by using the ID 04 n sequence, which
is handled exactly the same as 10 04 n.
Unlike the A756, that had a dedicated connector and resultant dedicated status reporting for each cash drawer, the
A776 has a single connector that shares data reporting from either cash drawer. When either cash drawer is open, an
open status is reported by the printer.
Related information
1 = Transmit printer status
Bit Status Hex Decimal Function
0 Off 00 0 Fixed to Off.
1 On 02 2 Fixed to On.
2 Off 00 0 One or both cash drawers open.
On 04 4 Both cash drawers closed.
3 Off 00 0 Not busy at the RS-232C interface.
On 08 8 Printer is busy at the RS-232C interface.
4 On 10 16 Fixed to on.
5 Undefined.
6 Undefined.
7 Off 00 0 Fixed to off.
Continued . . .