GConnector Pin Assignments

RS-232C Connector

Nine-Pin RS-232C Serial Connector
Pin No. Signal Name Abbreviation Direction
1Carrier detect CD Input
2Receive data RD Input
3Transmit data TD Output
4Data terminal ready DTR Output
5Signal ground SG
6Data set ready DSR Input
7Request to send RTS Output
8Clear to send CTS Input
9Ring indicator Pi Input

25-Pin Centronics-Type

Parallel Connector

Pin No. Signal Name Abbreviation Direction
1Strobe STROBE- Output
2Data 0 DATA0 Output
3Data I DATA1 Output
4Data 2 DATA2 Output
5Data 3 DATA3 Output
6Data 4 DATA4 Output
7Data 5 DATA5 Output.
8Data 6 DATA6 Output
9Data 7 DATA7 Output
10 Acknowledge ACK- Input
11 Busy BUSY Input
12 Paper empty PE Input
13 Select SLCT Input
14 Auto feed AUTO FEED- Output
15 Printer error PERROR- Input
16 Initialize printer INIT- Output
17 Select input SLCT IN- Output
18-25 Ground GND
Connector Pin Assignments G- 1