Epson LQ-300 User Manual - Page 93

Serial pin assignments, DTR protocol, XON/XOFF protocol

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Synchronization: Handshaking: Parity check Connector: Asynchronous DTR protocol, XON/XOFF protocol, ETX/ACK protocol (selectable) Odd, even, or none (selectable) EIA standard, 25-pin, D-SUB, female connector Serial pin assignments The following table lists the serial connector pin assignments and describes their respective interface signals. Pin No. 1 2 3 4 7 11 20 Signal Protective Ground (FG) Transmitted Data (TXD/SD) Received Data (RXD/RD) Request to Send (RTS/RS) Signal Ground (SG) Direction - out In out - Reverse Channel out Data Terminal Ready out (DTR/ER) Description Printer's chassis ground Printer has transmitted serial data Printer has received serial data Always positive Return path for data control signals Connected to Pin 20 Positive when the printer is ready to accept data, and negative when the printer is not ready Appendix A-9

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Synchronization:
Handshaking:
Parity check
Connector:
Asynchronous
DTR protocol, XON/XOFF protocol,
ETX/ACK protocol (selectable)
Odd, even, or none (selectable)
EIA standard, 25-pin, D-SUB, female
connector
Serial pin assignments
The following table lists the serial connector pin assignments and
describes their respective interface signals.
Pin No.
Signal
Direction
Description
1
Protective Ground (FG)
Printer's chassis ground
—
2
Transmitted Data (TXD/SD)
out
Printer has transmitted serial data
3
Received Data (RXD/RD)
In
Printer has received
serial
data
4
Request to Send (RTS/RS)
out
Always positive
7
Signal Ground (SG)
—
Return path for data control signals
11
Reverse Channel
out
Connected to Pin 20
20
Data Terminal Ready
(DTR/ER)
out
Positive when the printer is ready to
accept data, and negative when
the printer is not ready
Appendix A-9