Epson C11C294131BZ User Manual - Page 85

Serial interface specifications, Serial pin assignments

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Serial interface specifications The serial interface has the following characteristics. Bit rate: 300, 600, 1200, 2400, 4800, 9600, 19200 bps (selectable) Word length: Data format Start bit Parity bit Stop bit 7 or 8-bit (selectable) 1 bit 0 or 1 bit (selectable) 1 bit (transmitting), 1 bit or more (receiving) Synchronization: Asynchronous Handshaking: DTR protocol, XON/XOFF protocol ETX/ACK protocol (selectable) Parity check: Odd, even, or no parity bit (selectable) Connector: 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 5 7 11 20 Signal Direction Protective Ground (FG)  Transmitted data (TXD/SD) Out Received data (RXD/RD) In Request to Send (RTS/RS) Out Clear to Send (CTS/CS) In Signal Ground (SG)  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 Ignored 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 A-8 Appendix

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Serial interface specifications
The serial interface has the following characteristics.
Bit rate:
300, 600, 1200, 2400, 4800, 9600, 19200 bps
(selectable)
Word length:
Data format
7 or 8-bit (selectable)
Start bit
1 bit
Parity bit
0 or 1 bit (selectable)
Stop bit
1 bit (transmitting), 1 bit or more (receiving)
Synchronization:
Asynchronous
Handshaking:
DTR protocol, XON/XOFF protocol
ETX/ACK protocol (selectable)
Parity check:
Odd, even, or no parity bit (selectable)
Connector:
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
5
Clear to Send (CTS/CS)
In
Ignored
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
A-8
Appendix