Setting Scsi Ids; Scsi Connector Pin-Number Assignments - IBM x 340 Series Hardware Maintenance Manual

Table 15. 68-pin SCSI connector pin-number assignments.
Pin
1 +Data 12
2 +Data 13
3 +Data 14
4 +Data 15
5 +Data P1
6 +Data 0
7 +Data1
8 +Data 2
9 +Data 3
10 +Data 4
11 +Data 5
12 +Data 6
13 +Data 7
14 +Data P
15 Ground
16 DIFFSENS
17 Term power
18 Term power
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Hardware Maintenance Manual: xSeries 340 Model 6RY
For information about the maximum length of SCSI cable between the terminated
ends of the cable, refer to the ANSI SCSI standards. Adhering to these standards will
help ensure that your server operates properly.

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.
The hot-swap-drive backplane controls the SCSI IDs for the internal hot-swap drive
bays. However, when you attach SCSI devices to the external SCSI connector, you
must set a unique ID for the device. Refer to the information that is provided with the
device for instructions to set its SCSI ID.

SCSI connector pin-number assignments

The following table shows the pin-number assignments for the 68-pin SCSI
connectors.
34
68
Signal
1
35
Pin
35 -Data 12
36 -Data 13
37 -Data 14
38 -Data 15
39 -Data P1
40 -Data 0
41 -Data 1
42 -Data 2
43 -Data 3
44 -Data 4
45 -Data 5
46 -Data 6
47 -Data 7
48 -Data P
49 Ground
50 Ground
51 Term power
52 Term power
Signal