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In a daisy-chain configuration, two types of termination methods can be used. To
terminate individual drives, install a set of four
150n
resistors in each drive as shown in
Figure 2-4.
DISK DRIVE CONTROLLER
SG
AO
BO
B1
Bn
r
CABLEA
CABLE B
-
-
/
-
\
/
-
\
V
V
~
V
~
~~
A
IB~
A
I ;
A
IB~
*TERM
*TERM
*TERM
DISK DRIVE
DISK DRIVE
- - -
DISK DRIVE
0
1
4
(maximum)
*
TERMINATING RESISTORS INSTALLED ON EACH DRIVE
Figure 2-4 Individual Drive Termination/Daisy-Chain System
To terminate the last drive, install a set of four
56n
resistors in the final drive of the chain
as shown in Figure 2-5.
DISK DRIVE CONTROLLER
SG
AO
BO
B1
Bn
r
CABLEA
-
CABLE B
/
-
\
/
-
\
V
V
-
~
V
-
~
S~
I
A
I
ls-
I
A
I
[B-
A
IB~
*TERM
DISK DRIVE
DISK DRIVE
---
DISK DRIVE
0
1
4
(maximum)
* TERMINATING RESISTORS INSTALLED ONLY ON LAST DRIVE
Figure 2-5 Last Drive Termination/Daisy-Chain System
2-3
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