Epson EPL-7000 User Manual - Page 220

RS-422, Description, Transmits data. This pin transmits serial, RS-232C, Direction

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Interface Specifications Signal Pin RS-232C RS-422 Direction Description 1 FG - This line is connected to the printer chassis. 2 TXD OUT Transmits data. This pin transmits serial data from the printer to the computer. 3 RXD (RD+) IN Received data. This pin transmits serial (IN) data from the computer to the printer. 4 RTS OUT Request to send. This pin is held HIGH by the printer. 5 CTS IN Clear. This pin indicates that the computer is ready to receive data from the printer. The printer will not proceed unless the signal is HIGH. Can be set HIGH with SelecType. 6 DSR IN Data set ready. This pin indicates that the computer is ready to receive data from the printer. Can be set HIGH with SelecType. 7 SG 8 DCD - Signal ground. This pin provides a ground for all the signal lines. IN Data carrier detect. Always ignored. 9 (SD+) (OUT|) Send data. This pin sends serial data from the printer to the computer. Signal level is RS-422. 10 (SD-) (OUT) Send data. This pin sends serial data from the printer to the computer. Signal level is RS-422. 18 (RD-) (IN) Receive data. This pin transmits serial data from the computer to the printer. Signal level is RS-422. 8-14 Technical Specifications

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Interface
Specifications
Signal
Pin
RS-232C
RS-422
Direction
Description
1
FG
—
This line is connected to the printer
chassis.
2
TXD
OUT
Transmits data. This pin transmits serial
data from the printer to the computer.
3
RXD
(RD+)
IN
Received data. This pin transmits serial
(IN)
data from the computer to the printer.
4
RTS
OUT
Request to send. This pin is held HIGH
by the printer.
5
CTS
IN
Clear. This pin indicates that the
computer is ready to receive data from
the printer. The printer will not proceed
unless the signal is HIGH. Can be set
HIGH with SelecType.
6
DSR
IN
Data set ready. This pin indicates that the
computer is ready to receive data from
the printer. Can be set HIGH with
SelecType.
7
SG
—
Signal ground. This pin provides a
ground for all the signal lines.
8
DCD
IN
Data carrier detect. Always ignored.
9
(SD+)
(OUT|)
Send data. This pin sends serial data
from the printer to the computer. Signal
level is RS-422.
10
(SD-)
(OUT)
Send data. This pin sends serial data
from the printer to the computer. Signal
level is RS-422.
18
(RD-)
(IN)
Receive data. This pin transmits serial
data from the computer to the printer.
Signal level is RS-422.
8-14
Technical Specifications