Pinouts of Connectors

SCSI External D-Sub (PC/Amiga/Apple Macintosh) connector pinout

layout
schematic diagram
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25 pin D-SUB FEMALE connector pin-out & layout
25 pin D-SUB FEMALE connector  at the controller
Pin Name Dir Description
1 /REQ --> Request
2 /MSG --> Message
3 I/O --> Input/Output
4 /RST <-> Reset
5 /ACK <-- Acknowledge
6 BSY <-> Busy
7 GND --- Ground
8 DB0 <-> Data Bus 0
9 GND --- Ground
10 DB3 <-> Data Bus 3
11 DB5 <-> Data Bus 5
12 DB6 <-> Data Bus 6
13 DB7 <-> Data Bus 7
14 GND --- Ground
15 C/D --> Control/Data
16 GND --- Ground
17 /ATN <-- Attention
18 GND --- Ground
19 /SEL <-> Select
20 PARITY <-> Data Parity
21 DB1 <-> Data Bus 1
22 DB2 <-> Data Bus 2
23 DB4 <-> Data Bus 4
24 GND --- Ground
25 TMPWR <-> Termination Power
Caution: This interface uses the same type of connector as a standard RS-232 serial interface but is electrically very different. Do not connect RS-232 devices or cables to this port. Doing so can damage the device and the computer.

Note: Direction is Device relative Bus (other Devices). Total length of all SCSI cables should not exceed 20 feet (6 meters).

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25 pin D-SUB MALE connector pin-outs & layouts
25 pin D-SUB MALE connector  at the cable
Pinouts.ru > Pinouts of different harddrives connectors >  Pinout of SCSI External D-Sub (PC/Amiga/Apple Macintosh) connector and layout of 25 pin D-SUB FEMALE connector and 25 pin D-SUB MALE connector

Source(s): Hardware Book
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