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Programming
Status Reporting
02/11/2009 TTP 7020™/TTP 7030™ Technical Manual P1003636-001
Status Reporting
The printer is equipped with a number of sensors that report the printer status and various error
conditions such as out-of-paper, previous printout not removed, etc.
A good practice in unattended printer applications is to check for errors and paper availability
before printing.
1. Send a Status Report Query (ESC ENQ 6, see page 64) and check that the answer is "No
errors"
2. If an error is indicated, read out the error message with Status Request (ESC ENQ 1,
page ), and take appropriate actions. Repeat this step until no more error code is available.
If weekend sensor signals that paper is below this level, check again after next document
is printed. If the sensor still signals a level below the weekend level after three successive
print/check cycles, report the condition to the systems supervisor so that he can schedule a
service visit to the printer. This three-cycle check is to ensure that dirt on the side of the
roll does not cause the alarm.
3. Send a paper-near-end query (ESC ENQ 2, see page 62) to see if the sensor reports low
paper level.
4. If paper-near-end is indicated, report the condition to the systems supervisor so that he can
schedule a service visit to the printer.
5. Print the printout.
Important • A status reply must be read! Sending a second status query without reading the
reply of the first query may lock the printer.
Note • When using a multitask OS, status queries and responses may not be transferred
immediately from your application to the printer and vice versa. So write your program in
such a way that it repeats the query if it gets a timeout or an invalid reply. Good practice is to
ask once every 2-3 seconds, five times before giving up.
Note • You should construct your application in such a way so as not to request status while
printing, as this can result in loss of data.
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