Epson Action Laser Action Laser User Manual page 203

Signal
Pin Signal
10 SD
11 REV
18
RD
20 DTR
25
+5V DC
* Signal is operational for the interface.
RS-232C RS-422A
(SD+)
non-
invert
*
(RD+)
*
*
Inferface Specifications
Direction Description
Send data. This
OUT
pin sends serial
data from the printer to
the computer. Signal level
is RS-422A.
Same as DTR.
OUT
Receive data. This pin
IN
transmits serial data from
the computer to the printer.
Signal level is RS-422A.
OUT 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