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Appendix D
Connector Pinouts
I/O Ports
RS-232C Serial port
(9-pin subminiature “D” connector):
Pin #
I/O Type:
1
Input
2
Input
3
output
4
output
5
Ground
6
Input
7
Output
8
Input
9
Input
Signal Name:
Carrier Detect (CD)
Receive Data (RD)
Transmit Data (TxD)
Data Terminal Ready (DTR)
Singal Ground (GND)
Data Set Ready (DSR)
Request to Send (RTS)
Clear to Send (CTS)
Ring lndicator (RI)
Note
All signals conform to EIA Standard RS-232C.
Centronics-compatible parallel printer port
(25-pin subminiature “D” connector):
Pin #
I/O Type:
1
Input
2
output
3
output
4
output
5
output
6
output
7
output
8
output
Signal Name:
-Strobe
Data Bit
0
Data
Bit
1
Data Bit
2
Data
Bit
3
Data Bit
4
Data Bit
5
Data Bit
6
Connector Pinouts D-l