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Signal level
Mark (1)
Space (0)
3V to 27V
+3V to +27V
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 drops
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 512.
Error handling
A * character is printed if a parity error is detected.
All other errors are ignored.
Connector
D-SUB 25-pin connector
In the table below, the direction of signals is given relative to
the printer.
Pin
number
2
20
Signal
TXD
DIR
Signal Description
direction
out
Transmits data for X-on/X-off
out Whether or not the printer is ready to
receive data
3
RXD
in
Receives data
7
SG
-
Signal ground level
1
FG
-
Printer chassis ground
Other pins are not used.
8-14 Technical Specifications