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UBI EasyCoder 91 – Installation & Operation Ed. 1
Appendix 3 Communication Cables
Computer end:
Depends on type of host computer.
IBM-XT: DB25 female connector.
IBM-PS2: DB25 female connector.
IBM-AT: DB9 female connector
Printer end:
DB9 male connector.
Host
EasyCoder 91
Host
Signal DB-9
DB-9 Signal DB9 DB-25 Signal
1
+5V
1
RXD
2
2
TXD
2
3
RXD
TXD
3
3
RXD
3
2
TXD
DTR
4
4
–
4
20
DTR
GND
5
5
GND
5
7
GND
DSR
6
6
RDY
6
6
DSR
RTS
7
7
–
7
4
RTS
CTS
8
8
RDY
8
5
CTS
9
–
9
Serial
Interface
(RS 232C)