National Instruments TB-2641 Installation Instructions Manual
INSTALLATION INSTRUCTIONS
NI TB-2641
8 × 64 1-Wire Matrix Terminal Block for the NI PXI-2532
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Introduction
The NI TB-2641 terminal block configures the NI PXI-2532 as an 8 × 64
1-wire matrix. The NI TB-2641 has ribbon cable headers to connect signals
to the switch, and it provides optional isolation resistors to protect the reed
relay from capacitive loads.
Refer to the NI Switches Getting Started Guide to determine when to install
the terminal block.
Make sure you have the following:
• NI TB-2641 terminal block
• 1/8 in. flathead and #1 Phillips screwdrivers
• Eight 2 mm jumpers
• Two 34 conductor, 28 AWG, .050 in. pitch ribbon cable assemblies
(not included)
• One 16 conductor, 28 AWG, .050 in. pitch ribbon cable assembly
(not included)
Note Refer to the Accessories section for information about ordering the appropriate cable
assemblies.
Connecting Ribbon Cables
To connect ribbon cables to the terminal block, refer to Figures 1 and 2
while completing the following steps:
1. Remove the top cover screw.
2. Gently remove the top cover from the terminal block.
3. Loosen the two screws on the strain-relief assembly and remove the
strain-relief bar.
4. Remove the two screws from the column connection board and retain
the plastic spacer.
5. Disconnect the column connection board from the module interface
board by sliding it toward the front of the terminal block housing.
6. Connect each ribbon cable to the appropriate headers on the column
connection board and the module interface board.
7. Reassemble the terminal block.
Note For information about protection resistance and matrix expansion, refer to the
NI Switches Help.
2
8
1 Top Cover Screw
2 Top Cover
3 Strain-relief Screws
4 Strain-relief Bar
5 Column Connection Board Screws
3
4
6
6 Column Connection Board
7 Module Interface Board
8 Column Headers
9 Row Headers
10 Housing
5
1
7
9
10
NI TB-2641 Installation Instructions 2 ni.com
Figure 1. NI TB-2641 Terminal Block
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