Data Translation DT3145, Руководство по началу работы

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Chapter 3
18
Selecting an Expansion Slot
To select an expansion slot, perform the following steps:
1. Select a 32-bit, 33 MHz PCI master expansion slot. Refer to your
computer system’s user manual to determine which slots are bus
masters.
PCI slots are shorter than ISA or EISA slots and are usually white
or ivory. Commonly, three PCI slots (one of which may be a
shared ISA/PCI slot) are available. If an ISA board is located in a
shared slot, you cannot use the slot for a PCI board; likewise, if a
PCI board is located in a shared slot, you cannot use the slot for
an ISA board.
Note: In most PCI systems, any PCI slot can be a bus master.
2. Remove the cover plate from the selected expansion slot. Retain
the screw that held it in place; you will use it later to install the
board.
Next, configure the trigger selection jumper, as described in the next
section.
Configuring the Trigger Selection Jumper
The DT3145 frame grabber board contains a trigger selection jumper
that allows you to specify whether the external trigger input is a
common-ground isolated signal or a TTL-level input signal, as
follows:
• Isolated signal – The trigger input is common-ground isolated
and rated for +32 V of isolation. This is the default position of the
jumper. Note that the optical isolator adds a delay of
approximately 20
µ
s to the trigger input.