Piedinature - Pinouts
SCSI External Centronics 50 (Differential)

Reference and Sources:

50 PIN CENTRONICS FEMALE (At the controller & devices)

50 PIN CENTRONICS MALE (At the cable)

50 PIN CENTRONICS FEMALE at the controller & devices.
50 PIN CENTRONICS MALE at the cable.

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

Note: Direction is Device relative Bus (other Devices).

For more informations, references and sources go to

Piedinature - PinoutsSCSI External Centronics 50 (Differential)