Hardware pinouts information and cables schemes

SCSI Centronics 50 pin (Differential) pinout

hard drive connector

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use RJ-21 (or RJ21) registered jack standard connector, also known as a 50-pin telco connector, or an Amphenol connector.

50 pin Amphenol female connector layout

50 pin Amphenol female connector
at the controller & devices



Pin Name Dir Description
01GND---Ground
02+DB0<->+Data Bus 0
03+DB1<->+Data Bus 1
04+DB2<->+Data Bus 2
05+DB3<->+Data Bus 3
06+DB4<->+Data Bus 4
07+DB5<->+Data Bus 5
08+DB6<->+Data Bus 6
09+DB7<->+Data Bus 7
10+DBP<->+Data Bus Parity (odd Parity)
11DIFFSENS????
12res-Reserved
13TERMPWR<->Termination Power
14res-Reserved
15+ATN<--+Attention
16GND---Ground
17+BSY<->+Bus is busy
18+ACK<--+Acknowledge
19+RST<->+Reset
20+MSG-->+Message
21+SEL<->+Select
22+C/D-->+Control or Data
23+REQ-->+Request
24+I/O-->+In/Out
25GND---Ground
26GND---Ground
27-DB0<->-Data Bus 0
28-DB1<->-Data Bus 1
29-DB2<->-Data Bus 2
30-DB3<->-Data Bus 3
31-DB4<->-Data Bus 4
32-DB5<->-Data Bus 5
33-DB6<->-Data Bus 6
34-DB7<->-Data Bus Parity7
35-DBP<->-Data Bus Parity (odd Parity)
36GND---Ground
37res-Reserved
38TERMPWR<->Termination Power
39res-Reserved
40-ATN<---Attention
41GND---Ground
42-BSY<->-Bus is busy
43-ACK<---Acknowledge
44-RST<->-Reset
45-MSG-->-Message
46-SEL<->-Select
47-C/D-->-Control or Data
48-REQ-->-Request
49-I/O-->-In/Out
50GND---Ground

Note: Direction is Device relative Bus (other Devices)


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50 pin Amphenol male connector diagram

50 pin Amphenol male connector
at the cable

Pinouts.ru > Hard drives connectors pinouts listing >  Pinout of SCSI Centronics 50 pin (Differential) and layout of 50 pin Amphenol female connector and 50 pin Amphenol male connector
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Source(s) of this and additional information: Hardware Book, Karsten Wenke 0 reports
Last updated at Sat Jun 25 2005. Submit additions or corrections for this document. Is this document correct or incorrect? What is your opinion?
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