Dell PowerEdge SC 420 - Manual (Page 7)

Table B-1. Serial Connector Pin Assignments
Parallel Connector
The integrated parallel connector, intended primarily for use by printers that require data in parallel format, uses a 25-pin D-subminiature connector on the
system's back panel. The default designation of the system's parallel connector is LPT1. If you add an expansion card containing a parallel connector
configured as LPT1 (IRQ7, I/O address 378h), use the System Setup program to remap the integrated parallel connector. See "Using the System Setup
Program" in the User's Guide.
Figure B -3 illustrates the pin numbers for the parallel connector and Table B -2 defines the pin assignments for the connector.
Figure B-3. Parallel Connector Pin Numbers
Table B-2. Parallel Connector Pin Assignments
PS/2-Compatible Keyboard and Mouse Connectors
Pin Signal I/O Definition
1 DCD I Data carrier detect
2 SIN I Serial input
3 SOUT O Serial output
4 DTR O Data terminal ready
5 GND N/A Signal ground
6 DSR I Data set ready
7 RTS O Request to send
8 CTS I Clear to send
9 RI I Ring indicator
Shell N/A N/A Chassis ground
Pin Signal I/O Definition
1 STB# I/O Strobe
2 PD0 I/O Printer data bit 0
3 PD1 I/O Printer data bit 1
4 PD2 I/O Printer data bit 2
5 PD3 I/O Printer data bit 3
6 PD4 I/O Printer data bit 4
7 PD5 I/O Printer data bit 5
8 PD6 I/O Printer data bit 6
9 PD7 I/O Printer data bit 7
10 ACK# I Acknowledge
11 BUSY I Busy
12 P E I Paper end
13 SLCT I Select
14 AFD# O Automatic feed
15 ERR# I Error
16 INIT# O Initialize printer
17 SLIN# O Select in
18–25 GND N/A Ground