GRAPHTEC MP303-04 - HP-GL Command Error Handling; HP-GL Error Messages Explained

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5.10 HP-GL™ Command Errors
The plotter only displays the messages below when an error occurs for which masking of the corresponding
Error bit in the STATUS byte has been disabled using the IM command.
Displayed message Cause
E1.
COMM ERR
A command that cannot be recognized was executed.
Check that your program contains valid HP-GL™ com-
mands.
E2. PARA
NO. ERR
A command containing an incorrect number of pa-
rameters was executed.
Check that the commands specified in your program
are followed by the correct number of parameters.
E3. PARA
EXCEEDED
A command containing a parameter value that ex-
ceeds its permissible range was executed. Check the
permissible parameter range.
E5. PARA
UNKNOWN
A character that your plotter cannot plot was speci-
fied.