External SCSI Connector
The 68-pin external small computer system interface (SCSI) connector on the system back panel supports external Ultra SCSI devices such as
scanners, zip drives, and optical drives.
If you reconfigure your hardware, you may need pin number and signal information for the external SCSI connector. Figure 6 illustrates the pin
numbers for the external SCSI connector, and Table 5 lists and defines the pin assignments and interface signals for the external SCSI connector.
Figure 6. Pin Numbers for the External SCSI Connector
Table 5. Pin Assignments for the External SCSI Connector
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
PE
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
Signal ground
Pin
Signal
I/O
Definition
1-16
GND
N/A
Signal ground
17-18
TRMPWR
N/A
Terminator power
19
RSVD
N/A
Reserved
20-34
GND
N/A
Signal ground
35
D12
I/O
SCSI data bit 12
36
D13
I/O
SCSI data bit 13
37
D14
I/O
SCSI data bit 14
38
D15
I/O
SCSI data bit 15
39
DPARH
I/O
SCSI data parity high
40
D0
I/O
SCSI data bit 0
41
D1
I/O
SCSI data bit 1
42
D2
I/O
SCSI data bit 2
43
D3
I/O
SCSI data bit 3
44
D4
I/O
SCSI data bit 4
45
D5
I/O
SCSI data bit 5
46
D6
I/O
SCSI data bit 6
47
D7
I/O
SCSI data bit 7
Содержание Inspiron 620
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