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Connector Pin Assignments
RS-232C Connector
Nine-Pin RS-232C Serial Connector (Female IBM-AT)
Pin No. Signal Name Abbreviation Direction
1 Carrier detect CD Input
2 Receive data RD Input
3 Transmit data TD Output
4 Data terminal ready DTR Output
5 Signal ground SG
6 Data set ready DSR Input
7 Request to send RTS Output
8 Clear to send CTS Input
9 Ring indicator RI Input
Parallel Connector
25-Pin Parallel Printer Connector
Pin No. Signal Name Abbreviation Direction
1 Strobe STROBE– Output
2 Data 0 DATA0 Output
3 Data 1 DATA1 Output
4 Data 2 DATA2 Output
5 Data 3 DATA3 Output
6 Data 4 DATA4 Output
7 Data 5 DATA5 Output
8 Data 6 DATA6 Output
9 Data 7 DATA7 Output
10 Acknowledge* ACK– Input
11 Busy BUSY Input
12 Paper Out PE Input
13 Select SLCT Input
14 Auto Linefeed* AUTO FEED– Output
15 Error* PERROR– Input
16 Initialize printer* INIT– Output
17 Select input* SLCT IN– Output
18-25 Ground GND
*Note: Active Low
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Connector Pin Assignments G-1