Epson Action Laser - Manual (Page 202)

Inferface Specifications
Serial interface pin assignments
The serial interface connector pin assignments and a description of
the interface signals are shown in the table below. The direction of
signals is given relative to the printer.
Signal
Pin Signal RS-232C RS-422A Direction
1 FG * *
2 TD * OUT
3 RD * (RD-) IN
invert
4 RTS * OUT
Description
Frame ground. Safety
ground line.
Transmit data.
This pin transmits serial
data from the printer to
the computer.
Receive data.
This pin transmits serial
data from the computer to
the printer.
Request to send. This pin
is HIGH when power is on.
5 CTS * IN Clear to send. This pin
indicates that the computer
is ready to receive data
from the printer.
6 DSR * IN Data set ready. This pin
indicates that the computer
is ready to communicate.
7 SG * Signal ground. This pin
provides a ground for all the
signal lines.
9 SD
(SD-)
OUT Send data. This
invert pin sends serial data from
the printer to the computer.
Signal level is RS-422A.
B-12 Technical Specifications