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1269 User Manual
Understanding The 1269 6-5
modules absorbs heat and exits at the top of the module.
Cooling air is exhausted through the top of the mainframe in
the 1269 mainframe.
Cooling The Power
Supply
The power supply assembly contains a speed controller fan
for its own internal cooling. Filtered air enters through the rear
of the mainframe and exits at top (bench) or side (rack) after
passing through the power supply.
Manual Fan Speed
Switch (Non EMS
Units Only)
On 1269 mainframes not equipped with EMS option the user
may manually select between full or reduced fan speed by
adjusting the position of the manual fan speed switch. Refer
to
Figure 2-13.
Enhanced System
Monitor (EMS)
The Enhanced Monitoring System adds a fully VXIbus 1.4
compliant message-based interface, alpha numeric display,
individual VXIbus voltage and slot temperature reading, TTL
trigger in/outputs with programmable delay, and monitoring of
key VXI backplane signals (AS*, ACFAIL*, SYSRESET*).
Refer to
Figure 6-2 Enhanced Monitoring System (EMS)
Module Block Diagram
and the description below.
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