Dymo LabelWriter SE300, User Manual

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4-32
SYN EL Mode Graphics
DESCRIPTION
Provided for LabelWriter EL compatibility.
SYN is a synchronization character used to encode EL bitmap
print data. The number of bytes in each string is controlled by the
ESC D command. The starting position (left margin) is controlled
by the ESC B command. The control electronics in the printer do
not check the validity of the bitmap data, therefore, it is the
responsibility of the host software to send the correct number of
data bytes for the width of the print head in use by the printer.
The print head forms the image by heating a row of resistive
elements that blacken the thermally sensitive label material. The
resistive elements are 0.125 millimeters square (0.00492 inches)
and are spaced at eight dots per millimeter (203.2 dots per inch)
apart. The print head on the LabelWriter SE300 contain 448
elements. When a line is to be printed, the control electronics in
the printer load the desired data into a serial shift register (the
print head). The serial shift register has one location for each
print element. A “1” in any given location causes the
corresponding dot to be printed; a “0” leaves the dot un-printed.
The most significant bit (bit 7) prints at the left margin.
There is no command for clearing the shift register, therefore, the
entire register must be loaded for each print line in order to flush
out the old data. To reset the LabelWriter after a synchronization
error or to recover from an unknown state, the host computer
should send at least fifty-seven (57) ESC characters, followed by
an A, to request the printer to return the status byte. A minimum
of 57 ESC characters are required because this amount exceeds
the longest possible string of bitmap data bytes that the
LabelWriter expects.
SEE ALSO
ESC B
ESC D
ETB
EXPRESSION
ASCII SYN d1 … dn
Decimal 22 d1 … dn
Hex 16 d1 … dn
PARAMETERS