Appendix A System Interface Description

1. Serial Interface RS-232C

1.1Interface Characteristics

 

 

 

 

 

Signal Description RS-232C

Pin No.

Direction

 

 

 

 

PG

Protective Ground

1

-

 

 

 

 

TXD

Transmit Data (from printer to host)

2

OUTPUT

 

 

 

 

RXD

Receive Data (from host to printer)

3

INPUT

 

 

 

 

RTS

Request to Send (printer is requesting data transfer from host)

4

OUTPUT

 

 

 

 

CTS

Clear to Send (host is ready to receive data from printer)

5

INPUT

DSR

Data Set Ready (host is requesting data transfer from printer,

6

INPUT

 

can not be used for flow control, internaly set to "1")

 

 

 

 

 

 

SG

Signal Ground

7

-

 

 

 

 

DTR

Data Terminal Ready (printer is ready to receive - see also on the

20

OUTPUT

 

following pages the data communication protocols for detail meaning

 

 

 

 

 

 

STransmission rate: 600, 1200, 2400, 4800, 9600, or 19200 baud

S

Parity:

even, odd, none, or ignore

S

Word length:

7, or 8 bits

SNumber of stop bits: In receive mode the printer accepts 1, or 2 stop bits. The printer transmits always two bits.

Transmission Protocols:

SDTR - Ready/Busy (only RS-232C)

SXON/XOFF

SXON/XOFF + DTR

A-2

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Epson C I - 4 0 7 0, C I - 4 0 8 0 user manual Serial Interface RS-232C Interface Characteristics, Transmission Protocols

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