Scsi Cabling Requirements; Setting Scsi Ids - IBM 621410U - IntelliStation E - Pro 6214 Hardware Maintenance Manual

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
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.
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Hardware Maintenance Manual: IBM IntelliStation E Pro Type 6204 and Type 6214
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Table 16. SCSI connector-pin assignments
Pin Signal Pin
1 +DB (12) 18
2 +DB (13) 19
3 +DB (14) 20
4 +DB (15) 21
5 +DB (P1) 22
6 +DB (0) 23
7 +DB (1) 24
8 +DB (2) 25
9 +DB (3) 26
10 +DB (4) 27
11 +DB (5) 28
12 +DB (6) 29
13 +DB (7) 30
14 +DB (P) 31
15 GROUND 32
16 DIFFSENS 33
17 TERMPWR 34
1
35
Signal Pin
TERMPWR 35
RESERVED 36
GROUND 37
+ATN 38
GROUND 39
+BSY 40
+ACK 41
+RST 42
+MSG 43
+SEL 44
+C/D 45
REQ 46
+I/O 47
+DB (8) 48
+DB (9) 49
+DB (10) 50
+DB (11) 51
Signal Pin Signal
–DB (12) 52 TERMPWR
–DB (13) 53 GROUND
–DB (14) 54 GROUND
–DB (15) 55 –ATN
–DB (P1) 56 GROUND
–DB (0) 57 –BSY
–DB (1) 58 –ACK
–DB (2) 59 –RST
–DB (3) 60 –MSG
–DB (4) 61 –SEL
–DB (5) 62 –C/D
–DB (6) 63 –REQ
–DB (7) 64 –I/O
–DB (P) 65 –DB (8)
GROUND 66 –DB (9)
GROUND 67 –DB (10)
TERMPWR 68 –DB (11)