HP Model 712/100 hp 9000 series 700 model 712 technical reference manual (a261 - Page 56

Table 4-4. SCSI Interface Signals, Model 712 Technical Reference, Int. Mass Storage

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Connector Pinouts Table 4-4. SCSI Interface Signals Pin No. 02 04 06 08 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 Signal DB[0] DB[1] DB[2] DB[3] DB[4] DB[5] DB[6] DB[7] DB[P] To Description B Data Bus (LSB) B Data Bus B Data Bus B Data Bus B Data Bus B Data Bus B Data Bus B Data Bus (MSB) B Data Bus Parity Termpwr ATN BSY ACK RST MSG SEL C/D REQ I/O B Terminator Power Reserved Not Used (GND) D Indicates message available for drive Not Used (GND) B Signal indicating bus is in use D Data/Command transfer handshake D Or-tied signal indicating reset condition H Indicates message phase B Signal indicating selection/reselction phase H Indicates whether control or data info. is on data bus H DataCommand transfer handshake H Indicates direction of information transfer. Assertion indicates transfer to host. H = Host D = Drive B = Bidirectional Note: All odd pins shall be signal returns and shall be connected to signal GND at the drive, except pin 25 which is left free to protect against mis-insertion. 4-8 Int. Mass Storage Model 712 Technical Reference

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4-8
Model 712 Technical Reference
Int. Mass Storage
Connector Pinouts
Table 4-4. SCSI Interface Signals
Pin No.
Signal
To
Description
02
04
06
08
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
42
44
46
48
50
DB[0]
DB[1]
DB[2]
DB[3]
DB[4]
DB[5]
DB[6]
DB[7]
DB[P]
Termpwr
ATN
BSY
ACK
RST
MSG
SEL
C/D
REQ
I/O
B
B
B
B
B
B
B
B
B
B
D
B
D
D
H
B
H
H
H
Data Bus (LSB)
Data Bus
Data Bus
Data Bus
Data Bus
Data Bus
Data Bus
Data Bus (MSB)
Data Bus Parity
Terminator Power
Reserved
Not Used (GND)
Indicates message available for drive
Not Used (GND)
Signal indicating bus is in use
Data/Command transfer handshake
Or–tied signal indicating reset condition
Indicates message phase
Signal indicating selection/reselction phase
Indicates whether control or data info. is on data bus
DataCommand transfer handshake
Indicates direction of information transfer. Assertion
indicates transfer to host.
H = Host
D = Drive
B = Bidirectional
Note: All odd pins shall be signal returns and shall be connected to signal GND at the drive, except
pin 25 which is left free to protect against mis–insertion.