Serial interface, Rs-232 serial interface, Printer connector: db-9pin female rs-232 connector – Genicom PC4 User Manual
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EasyCoder PC4 User’s Guide
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Appendix C — Interfaces
RS-232 Serial Interface
Printer connector:
DB-9pin female RS-232 connector.
Printer
EasyCoder PC4
Host
Signal
DB-9
Signal
DB-9
DB-25
Signal
1
+5V 500 mA
1
1
RXD
2
TXD
2
3
RXD
TXD
3
RXD
3
2
TXD
DTR
4
–
4
20
DTR
GND
5
GND
5
7
GND
DSR
6
RDY
6
6
DSR
RTS
7
–
7
4
RTS
CTS
8
RDY
8
5
CTS
9
–
9
1
/.The combined load on the external +5V on both the parallel and the
serial port must not exceed a total of 500 mA.