A795 User Guide: Programming Supplement

Chapter 4: Programming commands

Status

Status command introduction

The A795 has three methods of providing status to the application. These methods are through

batch status commands, real time status commands and unsolicited status mode. An application

may use one or more of these methods to understand the current status of the printer. A brief

description of each of these methods follows.

Batch status commands – These commands are sent to

the printer and stored in the printer’s buffer. Once the

printer has processed all the previous commands these

commands are processed and the proper status is returned

to the application. In the event a condition causes the

printer to go BUSY, it stops processing commands from

the printer buffer. If a batch status command remained in

the buffer during this busy condition, it would not be

processed. In fact, no batch commands are processed

while the printer is in this state.

Real-time commands – These commands are sent to the

printer and are NOT stored in the printer’s buffer. Instead,

they are acted on immediately (regardless of the printer’s

BUSY status) and their response (if any) is returned to the

application. This gives the application the ability to query

the printer when it is in a busy state in order to correct

whatever fault has occurred.

Unsolicited status mode – This mechanism allows

the application developer to program the printer to

automatically respond with a four byte status when

certain conditions in the printer change.

Please see the subsequent sections for a more detailed

description of these status commands. At the end of this

status commands section is a page entitled “Recognizing

data from the printer”. This describes how to interpret

what command or setting (in the case of unsolicited status

mode) triggered a response from the printer.

Batch mode

For RS-232C printers, 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 are received.

When a fault occurs, the printer will go busy at the

RS-232C interface and not respond to any of the batch

mode 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.

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