Serial Pin Assignments - Epson LQ-300 User Manual

Synchronization:
Handshaking:
Parity check:
Connector:

Serial pin assignments

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