National Instruments 2806 User manual

INSTALLATION INSTRUCTIONS
NI 2806
Expansion Bridge for the NI SwitchBlock
This document describes how to install the NI 2806 expansion bridge for the NI SwitchBlock.
Installing the NI 2806 expansion bridge enables you to connect the analog buses of multiple
NI SwitchBlock carriers.
For information about enabling multiple devices to connect to the same analog bus line, refer to
the NI Switches Help.
National Instruments recommends using NI Switch Executive for multicarrier systems. The
NI Switch Executive Help includes information about creating multicarrier virtual devices using
NI Switch Executive.
What You Need to Get Started
To use the expansion bridge, you need the following items:
❑NI 2806 expansion bridge for the NI SwitchBlock
❑Two NI PXI-2800 NI SwitchBlock carriers
❑#1 Phillips screwdriver
Getting Started with the NI 2806 Expansion Bridge for
the NI SwitchBlock
Complete the following steps to install the NI 2806 expansion bridge between
two NI SwitchBlock carriers.
1. Power off the chassis.
2. Determine which expansion bridge connectors on each carrier will connect to the expansion
bridge.
When the carriers you want to connect are adjacent to each other in a PXI chassis, the
expansion bridge connectors that face each other will connect to the expansion bridge.
3. Refer to Figure 1 and unscrew the two screws on the expansion bridge connector covers
determined in step 2 using the #1 Phillips screwdriver.
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NI 2806 Installation Instructions 2 ni.com
4. Remove the expansion bridge connector covers only from the expansion bridge connectors
that will connect to the expansion bridge.
Caution You must replace the expansion bridge connector covers if you remove the
NI 2806 expansion bridge.
Figure 1. Removing the Expansion Bridge Connector Cover from the NI PXI-2800
5. Insert the NI PXI-2800 carriers in adjacent positions in the chassis. For carrier installation
instructions, refer to the NI Switches Getting Started Guide.
6. Ensure that you hold the expansion bridge in the correct orientation as shown in Figure 2.
Note the THIS EDGE UP silk screen on the PCB.
1 NI PXI-2800 Carrier 2 Screws 3 Expansion Bridge Connector Cover
1
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©National Instruments Corporation 3 NI 2806 Installation Instructions
Figure 2. Correct Orientation of the NI 2806 Expansion Bridge
7. Refer to Figure 3 and insert the NI 2806 expansion bridge between the two carriers until the
latches engage.
Figure 3. Inserting the NI 2806 Expansion Bridge
1Chassis
2 NI PXI-2800 Carriers
3 NI 2806 Expansion Bridge
4 Latches
THISEDGE UP
THISEDGE UP
ANALOG BUS
2A, 150V CAT I MAX
NI 2806 Expansion Bridge
for NI SwitchBlock
NI 2806 EXPANSION BRIDGE FOR NI SWITCHBLOCK
FOR PATENTS:
NI.COM/PATENTS
ASSY 150041A-01L
© COPYRIGHT 2010
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NI PXI-1045
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© 2010–2011 National Instruments Corporation. All rights reserved.
375530B Aug11
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If the latches do not engage, ensure that the expansion bridge is inserted in the orientation
shown in Figure 2. The expansion bridge fully inserts only with the correct edge up.
Note The NI 2806 expansion bridge should not be used above the operational shock
limit. Refer to the NI SwitchBlock carrier or card specifications for these limits.
Remove or secure the NI 2806 prior to shipping and prior to use in a high-shock
environment.
Note To prevent unintentional shorts of source channels between hardwire analog
bus paths, you cannot use any NI SwitchBlock carrier connected by the NI 2806
expansion bridge until all connected carriers have been loaded by the driver. Failure
to load the driver on any carrier connected by the expansion bridge will disable all
other carriers connected to the same bus.
Removing the NI 2806 Expansion Bridge
Complete the following steps to remove the NI 2806 expansion bridge:
1. Power off the chassis.
2. Squeeze the expansion bridge latches and pull gently on the expansion bridge.
3. Remove the carriers that were connected to the expansion bridge.
4. Reinstall the expansion bridge connector covers with the provided 2-56 × 3/16 inch long,
pan head screws.