Download the full package (micro code, bill of
material, logics, and printer rework instructions) here HP82240B_adapter.zip.
Current firmware images included:
Jumper selectable 9600 8N1 or 2400 8N1 serial link speed.
Jumper selectable IR or direct connect mode (enable / disable carrier
frequency)
The basic operation is you send the serial just as describe in the
operators manual. The PIC will buffer the data until you have a full
line. Once a full line is detected the PIC will drive the busy line low
and send the data out the IR / direct link. Once the send is finished
the busy line will stay low for 2 seconds. (This is the maximum time
the printer requires to print a line) Once the 2 second timer has
expired the busy line will go high and the message will be sent back
out the serial port. Any messages recived while the busy line is active
will be ignored and discarded.
This firmware supports both the basic ASCII mode and the advanced
graphic printing (See escape sequences in the manual).
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