CPU
Module
0
Temperature
monitor
Each
module's
temperature
is
monitored
for
two
thresholds.
At
the first
threshold, a cooling failure
warning
is issued,
and
a cooling failure LED is
lit.
At
the second threshold, DC
power
is
removed
from the module.
0 Ethernet twisted
pair
output
This circuit converts the Ethernet AUI
output
from the
CPU
board
to a 10
Base T twisted
pair
output.
0
I/0
The front
panel
of the
I/0
Distribution
board
provides:
one
SCSI-2
port
(cable daisy-chained to SCSI modules)
one
RJ45
port
labeled
CONTROL
(cable daisy-chained to SCSI
modules)
four serial
ports
one
RJ45 twisted
pair
Ethernet
port
labeled 10 BASE T
one
DB15 AUI
port
modem
present
LED
System Power Control
The
I/0
distribution
board
provides
circuits
that
enable
and
disable, (turn
on
and
off), the
power
supplies
in
all system modules. The circuitry
that
does
this
is
powered
by
the base
system
power
supply.
It
is this circuitry
that
is
connected to the keylock switch
on
the
front of
the
CPU Module.
Power
Monitor
Function
A circuit
on
the
I/0
distribution
board
detects
when
any
module's
power
supply
5 V
output
is substantially
out
of regulation.
When
the
out
of
regulation condition persists,
and
for 200
millisecond
minimum
after, the
I/0
distribution
board
drives
VME
system
reset.
Keylock Switch Reset Function
2-2
The
I/0
distribution
board
resets the
modem
and
the cooling failure
power
shut
down
circuitry
when
the
switch
is
in
the reset position. A
system
reset is
not
generated
by
this switch.
Reference
Guide
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Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
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