Error Handling - Epson LQ-1050 User Manual

Signal level
Mark (1) -3 V to -27 V
Space (0) +3 V to +27 V
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
6-pin DIN connector
In this table, the direction of signals is given relative to the printer.
Pin
Signal
n u m b e r
1 TXD
2 DTR
3 RXD
4 Not used
5 SG
6 CG
Technical Specifications
8-14
Signal
Direction
direction
Transmits data for X-on/X-off
out
out Indicates whether or not the printer is
ready to receive data. "Mark" level
indicates printer is not ready to
receive data.
in Receives data
-
Signal (logic) ground level
-
Printer chassis ground