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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 in the input buffer rises to 528.
Error handling
A * character is printed if a parity error is detected. All other errors are
ignored.
Connector
D-sub 25-pin connector
In this table, the direction of signals is given relative to the printer.
Initialization
There are the three ways that the printer can be initialized (returned to a
fixed set of conditions).
Hardware initialization
l
When the power is turned on
l
When the printer receives an INIT
signal at the parallel interface (pin 31
goes LOW).
Software initialization
l
Software sends the ESC @ (initialize
the printer) command.
Technical Specifications
A-13