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Handshaking
Handshaking by DTR signal or X-on/X-off. The DTR signal changes
to “mark”-meaning the printer is not ready to receive data-when
the number of bytes free in the input buffer goes down to 256. The
signal changes to
“space”-
meaning that the printer is now ready-
when the number of bytes free in the input buffer rises to 528.
Error handling
All errors are ignored.
Connector
6-pin DIN connector.
In this table, the direction of signals is given relative to the printer.
Table C-3. Serial interface pins
The pins are arranged as shown in Figure C-l. (The figure shows the
view from the back of the printer.)
Figure C-1.
Serial interface
C-4
The Serial Interface