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Jumper
for pins
A and B
Jumper
for pins
C and D Configuration
Off Off Drive is master; slave drive may be detected
using DASP– signal. CSEL is ignored.
Off On Drive is master; slave drive is present. CSEL
is ignored. DASP– is ignored.
On Off Drive is slave (a master drive should be
present also). CSEL is ignored.
On On Differentiate master and slave drives using
cable-select: If a drive is attached to a
connector in which pin 28 is grounded, then it
becomes a master. If a drive is attached to a
connector in which pin 28 is ungrounded,
then it becomes a slave.
Master/slave
configuration jumpers
Circuit board
Pin 1
Pin 20 removed for keying
Note. Drive is shown with
circuit board up.
B D
A C
Drive is master; slave may be detected using DASP– signal
Drive is master; Seagate slave drive present
Drive is slave; Seagate master drive present
Use CSEL pin grounding to differentiate master from slave
Figure 2. Connector and master/slave jumper setup
18 Marathon 2250 and Marathon 1680 Product Manual