1.2.2XON / XOFF

This protocol requires all signal lines.

S Pin

1

Protective Ground (PG)

S

2

Transmit Data (TXD)

S

3

Receive Data (RXD)

S

4

Request to Send (RTS)

S

5

Clear to Send (CTS)

S

6

Data Set Ready (DSR)

S

7

Signal Ground (SG)

S

20 Data Terminal Ready (DTR)

Standard Connection

25 pin

Appendix A System Interface Description

25 pin

For local connections RTS with CTS can be connected and likewise DTR with

DSR.

A-5

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Epson C I - 4 0 4 0, C I - 4 0 5 0 user manual XON / Xoff, Standard Connection, Dsr