Epson EPL-6000 User Manual - Page 202

Technical Specifications B-13, Signal level is RS-422A.

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Interface Specifications Signal Pin 10 Signal SD RS-232C RS-422A (SD+) noninvert 11 REV * 18 RD (RD+) 20 DTR * 25 +5V DC * Direction OUT OUT IN OUT - Description Send data. This pin sends serial data from the printer to the computer. Signal level is RS-422A. Same as DTR. 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. * Signal is operational for the interface. Technical Specifications B-13

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