Scanlab RTC 5 PC Interface Board, Installation And Operation Manual

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RTC
®
5 PC Interface Board
Rev. 1.9 e
15 Appendix A: The RTC
®
5 PC/104-Plus Board
587
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15.3.3 Installing the RTC
®
5 PC/104-
Plus Board
Figure 67 shows a typical module stack (PC/104
stack) consisting of a CPU board, an RTC
®
5 PC/104-
Plus board, a further PC/104- Plus module, a PC/104
16-bit module and a PC/104 8-bit module.
In general, these modules provide stack-through
connectors to pass the signals on for possible use by
the next module in a stack. Thus, you can install
modules above or below other modules as well as on
both sides of the CPU board.
PC/104- Plus modules are equipped with both PCI and
ISA busses. In contrast, PC/104 standard modules are
only equipped with an ISA bus and might therefore
interrupt PCI data transfer within a stack. As
RTC
®
5 PC/104- Plus board’s data transfer is via the
PCI bus, PC/104 standard modules in the stack must
be moved to higher stack positions.
The maximum stack height for the PCI bus is four
PC/104-
Plus modules (plus the CPU board). The
modules must be adjacently stacked on the same side
of the CPU board. Electrical configuration of a board
for its position in a stack can be specified via jumpers
(see
page 584 ).
If multiple synchronously-clocked RTC
®
5 PC/104- Plus
boards are to be used in a PC/104 stack, then the
RTC
®
5 PC/104- Plus boards must be installed in
adjacent stack positions.
For mechanical stability, all modules and the CPU
board are attached to each other via screws or spacer
bolts.
Caution!
• If several PCI boards in a PC/104- Plus stack are
operated by a PC/104- Plus CPU board, then you
should test the overall configuration (i.e. the
functionality of all boards in the stack). Some
CPU boards can create problems on the PCI bus.
To test the functionality of an RTC
®
5 PC/104-
Plus board in a stack, you should at least check
if rtc5_count_cards returns the correct number
of boards.
8-bit PC/104 module
16-bit PC/104 module
RTC®5 PC/104- Plus
PCI stack position 2
PC/104- Plus module
PCI stack position 1
PC/104- Plus
CPU board
spacer
67
Typical module stack