second, when low voltage differential (LVD) SCSI peripherals are attached. This
channel supports up to 15 SCSI devices. In addition, this adapter uses:
v
Double-transition clocking to achieve high transfer rates
v
Domain name validation to negotiate compatible data transfer speeds with each
device
v
Cyclic-redundancy checking for improved data reliability
SCSI cabling requirements:
If the computer comes with a SCSI adapter, you can
install five internal or external SCSI devices using the SCSI signal cable that comes
with the computer. If you plan to attach external SCSI devices, you must order an
additional SCSI cable. To select and order the correct cables for use with external
devices, contact the IBM reseller or IBM marketing representative. To receive an
indication of SCSI hard-disk drive activity, you must also connect the SCSI adapter
to the SCSI LED (J35) connector on the system board. See “System board” on
page 43 for the location of the SCSI connector.
Setting SCSI IDs:
Each SCSI device connected to a SCSI controller must have a
unique SCSI ID. This ID enables the SCSI controller to identify the device and
ensure that different devices on the same SCSI channel do not attempt to transfer
data simultaneously. SCSI devices that are connected to different SCSI channels can
have duplicate SCSI IDs. Refer to the information that is provided with the device
for instructions on setting its SCSI ID. With a SCSI adapter installed in the
computer, you can use its 68-pin SCSI connector to connect different types of SCSI
devices.
34
1
68
35
Table 16. SCSI connector-pin assignments
Pin
Signal
Pin
Signal
Pin
Signal
Pin
Signal
1
+DB (12)
18
TERMPWR
35
–DB (12)
52
TERMPWR
2
+DB (13)
19
RESERVED
36
–DB (13)
53
GROUND
3
+DB (14)
20
GROUND
37
–DB (14)
54
GROUND
4
+DB (15)
21
+ATN
38
–DB (15)
55
–ATN
5
+DB (P1)
22
GROUND
39
–DB (P1)
56
GROUND
6
+DB (0)
23
+BSY
40
–DB (0)
57
–BSY
7
+DB (1)
24
+ACK
41
–DB (1)
58
–ACK
8
+DB (2)
25
+RST
42
–DB (2)
59
–RST
9
+DB (3)
26
+MSG
43
–DB (3)
60
–MSG
10
+DB (4)
27
+SEL
44
–DB (4)
61
–SEL
11
+DB (5)
28
+C/D
45
–DB (5)
62
–C/D
12
+DB (6)
29
REQ
46
–DB (6)
63
–REQ
13
+DB (7)
30
+I/O
47
–DB (7)
64
–I/O
14
+DB (P)
31
+DB (8)
48
–DB (P)
65
–DB (8)
15
GROUND
32
+DB (9)
49
GROUND
66
–DB (9)
16
DIFFSENS
33
+DB (10)
50
GROUND
67
–DB (10)
17
TERMPWR
34
+DB (11)
51
TERMPWR
68
–DB (11)
84
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