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EXTERNAL TOGGLE SWITCH OPERATION
An external toggle switch can be connected between pin 5 and
pin 6 of the W7 header to simulate the on-board toggle switch. In
this configuration, the on-board toggle switch should be turned off
(down position), and the jumper remains in pin 1 and pin 3 of W7
header. The external switch can be mounted anywhere outside
the chassis for easier access.
connected through pin 9 and pin 10 of the W7 header, so it can
provide a status outside the chassis.
recommended instead of regular LED. The on-board LED and
the toggle switch do not need to be removed in this mode of
operation.
EXTERNAL LOGIC CONTROL OPERATION
The Bus Isolation Extender can also be controlled by external
TTL compatible signals. If the jumper remains on pin 1 and pin 3
of W7 header, a single TTL low control line connecting to pin 5 or
a TTL high signal to pin 8 of W7 header can control both the
power and signal isolation and connection as the toggle switch. If
the jumper on pin 1 and pin 3 of W7 header is removed, then two
TTL control lines can be used to control the bus signals and the
power separately. The TTL control line connects to pin 5 or pin 8
will control the power and the TTL control line that connects to pin
3 will control the signal.
The TTL control lines can come from
any digital output source, such as the output pins of the parallel
printer port in the CPU system. If the external TTL control lines
are from sources outside the same CPU system, the ground pins
on pin 6 or pin 7 of the W7 header should be connected to the
signal ground of the external sources. The power should be
connected first, then followed by the bus signals.
Notice that pin 5 allows a TTL low signal to power up the
extender, while pin 8 allows a TTL high signal to power up the
extender. For system that requires the extender to be powered up
from cold start, user can choose from available sources of either
initial high or initial low signal to bring the extender up.
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An external LED can also be
A blinking LED is
ISAIX16 User's Manual
VOLTAGE MARGIN, CURRENT MEASUREMENT AND
EXTERNAL POWER SOURCE
The ISAIX16 Bus Isolation Extender is provided with pluggable
slow blow fuses. One 4 amp fuses is used for the +5V and three
1.6 amp fuses are used for the -5V, +12V, and -12V. User can
perform voltage margin and current measurement with or without
the fuses. Without using the fuse,
connected to pin 2 or pin 3 of the fuse sockets to provide voltage
margin test to the add-on boards on the extender. By moving the
fuse to pin 2 and pin 4 location, user can provide power to pin 4
and still protected by the fuse. The pin 1 of these jumpers are
tie directly to the system power and they should not be
connected to external sources. When external power are
applied through the fuse sockets, the current are still controlled
by the MOSFETs, which regulates the ramping of the voltages.
A minimum of +4.5V on the +5V power line is required to
maintain the operation. Otherwise the logic on the extender will
shut down the analog switches and isolate the bus signals. A
short circuit sensing logic is also built in to protect the system.
The short circuit logic will sense shorts on +5V and +12V and
automatically shut off all power. The shorts can be either
introduced accidentally during test or may already exist on the
board under test.
In short circuit condition, the speaker will
generate a continuous tone to alert the user.
condition, the speaker will buzz once a second to alert the user
that the Bus Isolation Extender is powered up.
An ampere meter can be connected between the fuse socket pins
with or without the fuse to measure the current consumed by the
add-on board on top of the extender. The leads of the ampere
meter should be as short as possible, to avoid excessive voltage
drop below 4.5V.
User may change the fuses to other type, as long as the 5V will
not drop below 4.5V when the add-on board draws maximum
current.
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external power can be
In
normal