Epson PP 803 - Page 158

Appendix A System Interface Description
A-5
1.2.2 XON / XOFF
This protocol requires all signal lines.
$ Pin 1 Protective Ground (PG)
$ 2 Transmit Data (TXD)
$ 3 Receive Data (RXD)
$ 4 Request to Send (RTS)
$ 5 Clear to Send (CTS)
$ 6 Data Set Ready (DSR)
$ 7 Signal Ground (SG)
$ 20 Data Terminal Ready (DTR)
Standard Connection
For local connections
RTS
with
CTS
can be connected and likewise
DTR
with
DSR
.