Epson Action Laser - Manual (Page 203)

Inferface Specifications
Signal
Pin
10
Signal
SD
11
18
REV
RD
(RD+)
IN
20 DTR
25 +5V DC
RS-232C RS-422A Direction Description
*
*
*
(SD+)
non-
invert
* Signal is operational for the interface.
OUT
OUT Same as DTR.
OUT
—
Send data. This
pin sends serial
data from the printer to
the computer. Signal level
is RS-422A.
Receive data. This pin
transmits serial data from
the computer to the printer.
Signal level is RS-422A.
Data terminal ready. This
pin indicates whether or not
the printer is ready to
receive data. If the printer
ready protocol is not
selected, this pin is always
HIGH (i.e. the printer is
ready to receive data). If
printer ready protocol is
selected, the printer can
accept data when the pin
level is HIGH, and cannot
accept data when the pin
level is LOW, when busy.
Not a signal, but a +5V
power supply output.
Maximum of 300mA.
Technical Specifications B-13