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Troubleshooting
Common Problems and Corrective Action
The best method for troubleshooting development with the TLS PC Link
Programming Language is to use feedback characters. When these are enabled,
all System Level and Label Formatting Commands have a feedback character
sent after them. Looking at these feedback characters is very helpful in
determining where an error has occurred. If a command's response is an ASCII
'2', this means that a bad command was sent. If a command replies with an
ASCII '1', then a serial timeout has occurred. This means the printer was
expecting more data with the command. If the command replies with multiple
characters, such as multiple '2's, this is because the command was bad
somewhere in the middle. All characters that were sent after the invalid character
in the command respond with an error.
The following table lists common programming problems and suggested
corrective action.
If you are having problems with the hardware, refer to the TLS PC Link User's
Manual.
Problem
The printer acts sporadically when
downloading an image file.
Unable to read printer status
information while printing.
44
Possible Cause/Corrective Action
Possible Cause:
If downloading an 8-bit image, it is
likely that Immediate commands are
enabled. Immediate commands will
be detected within the image data.
This will corrupt the data, causing
the printer to see bad information.
Corrective Action:
Make sure immediate commands are
disabled whenever downloading an
8-bit data file.
Possible Cause:
If immediate commands were turned
off to download an image file, they
must be turned back on before
printing an image if it is desired to
send immediate commands (request
status) during the print job. If the
enable immediate commands is sent
after the print command, it will not
TM
TLS PC Link
Programmer's Guide
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