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
Summary of Contents for SQ-2550
Page 1: ...EPSON SQ 850 SQ 2550 24 NOZZLE INK JET PRINTER USER S GUIDE ...
Page 3: ...EPSON S Q 8 5 0 2 5 5 0 User s Guide ...
Page 25: ...3 Close the ink cartridge compartment cover Setting Up the Printer 1 13 ...
Page 153: ...The Cut Sheet Feeder 5 6 Using Printer Options ...
Page 181: ...Interface Boards 5 34 Using Printer Options ...
Page 287: ...Appendix Proportional Width Table A 2 Character Tables A 6 Appendix A l ...
Page 293: ...Character Tables EPSON Extended Graphics Character Table Appendix A 7 ...
Page 310: ......
Page 312: ...Print Enhancement Word Processing ...
Page 313: ......