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Performance Computer
Board Installation
Power Considerations
The PT-VME151A typically draws 25 ma. of +12V and -12V, and 3.9 Amps of +5V. These figures must
be added to those of any attached EPAK or EBOARD to determine the total power requirements. It is
recommended that Maximum values are used to ensure adequate margins. Add these numbers to those
of the other devices in the system and check that the incorporation of the PT-VME151A (and Option
Modules) does not exceed the system power supply ratings.
NOTE: On the PT-VME151A both 12V supplies are used by the RS-232 drivers attached to the DUART
and passed to the EPAK connector. +12V can also be used by EPROMS that require a VPP = 12V.
Slot Considerations
If you plan on using the System Controller functions of the PT-VME151A then it must be plugged into
the Slot 1 position of the VME backplane. The System Controller functions will be automatically enabled
after reset if the Slot 1 [BG3IN*] signal is open (or grounded).
For applications that do not require system controller functions the PT-VME151A can reside in any other
VMEbus Slot. There are two considerations that must be made when not using the PT-VME151A in Slot
1, any jumpers on the backplane for the Bus Grant and Interrupt Priority chains must be removed, and
the choice of slot location can effect the system level performance of the board.
Relative to other devices at the same Bus Grant and Interrupt Priority levels, the priority of a board goes
down as it moves away from Slot 1. Typically, slot position only becomes an issue when there are
extremely high levels of bus activity. The slot position, bus grant and interrupt priority levels should be
reviewed from a system perspective whenever a new board is configured into a system.
Backplane Insertion
WARNING: The chassis must be switched off before inserting the board or making any cable connec-
tions to avoid damage to yourself or the components!
After reviewing the Power Considerations and selecting a slot, insert the PT-VME151A into the back-
plane. Be sure that it is seated completely into the backplane then tighten the two Captive Chassis
Mounting Screws on the front panel. See "Figure 9: Example Serial port Cable" on page 26. Attach
cables as necessary then power up the system.
NOTE: The first time the system is powered up after inserting the card, check the supply voltages at the
PT-VME151A backplane P1 and P2 connectors. Adjust the supplies as necessary to the nominal voltage
levels (+12.00V, - 12.00V and +5.00V)
Extensible Single Board Computer/Controller User's Manual 21
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