HP V8.5 - Manual (Page 79)

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C - 2 V8.5e Rev 2.2.2002
C E N T R O N I C S I N T E R F A C E B O A R D
Once the V8.5E Centronics adapter is set to raster mode it
will remain in raster mode until the init line of the host
Centronics port is pulsed or the plotter power is cycled.
This will return the adapter to print mode.
2.) Enhanced transfer format
For more flexibility, a 6 byte header can be sent before
each scan of rastered data. This header allows variable
bytes/scan plotting. The Centronics adapter also returns to
print mode at the end of every scan using this transfer
method. This allows the five 1B, 4X commands or the
standard ASCII control codes listed below in section 3 to be
used during plotting. The format of the 6 byte header is:
1B 2A 72 XX YY 01 where XX = high byte of the
number of bytes/scan
YY = low byte of the
number of bytes/scan
Example: To send a plot that is rastered to 200 bytes/
scan, send the following 6 byte header be-
fore each and every scan of 200 bytes:
1B 2A 72 00 C8 01 00C8 hex = 200 decimal
for a plot consisting of 1728 bytes/scan, send
1B 2A 72 06 C0 01 06C0 hex = 1728 decimal
The valid number of bytes that can be sent to the V8.5E
using this transfer method is as follows:
V8.5E bytes/scan menu setting valid number of bytes/scan
raster data (XX YY)