Serial Interface Specifications; Serial Pin Assignments - Epson LX-300 User Manual

Serial interface specifications

The serial interface has the following characteristics.
Bit rate:
Word length:
Data format
Start bit
Parity bit
Stop bit
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
Clear to Send (CTS/CS)
5
Signal Ground (SG)
7
Reverse Channel
11
Data Terminal Ready
20
(DTR/ER)
A-8
Appendix
300, 600, 1200, 2400, 4800, 9600, 19200 bps
(selectable)
7 or 8-bit (selectable)
1 bit
0 or 1 bit (selectable)
1 bit (transmitting), 1 bit or more (receiving)
Asynchronous
DTR protocol, XON/XOFF protocol
ETX/ACK protocol (selectable)
Odd, even, or no parity bit (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
Ignored
In
Return path for data control
signals
Connected to Pin 20
Out
Positive when the printer is ready
Out
to accept data, and negative
when the printer is not ready