How to Connect Signals to the NI 2529

Overview

NI PXI-2529                                 NI PXIe-2529

The NI PXI/PXIe-2529 (NI 2529) is a high-density matrix built to serve high-channel-count switching applications. The module is a 2-wire matrix, configurable with front-mounting terminal blocks to achieve two different matrix configurations (4x32 and 8x16). The NI 2529 is designed to work well with both low and high-voltage levels. For low-voltage measurements, the NI 2529 uses relays with low thermal offset to ensure accurate measurements. These same relays can handle up to 150 Vrms or 150 VDC.

NI 2529 Terminal Blocks

There are two terminal blocks available for the NI 2529:

TB-2634: 4x32 2 -wire, dual 4x16 2-wire
TB-2635: 8x16 2 -wire

The NI 2529 can be used in 4x16 2-wire mode by removing resistors from the TB-2634. This will be covered in the Signal Connection with Terminal Blocks portion of the tutorial.

TB-2634

The National Instruments TB-2634 configures the NI 2529 high-density matrix switch as a 4x32 (2-wire) matrix. Connections are made with ribbon cable headers inside the housing.

The figure below outlines the main components of the TB-2634:

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The figure below clearly outlines how the ribbon cable headers on the TB-2634 map to the 2-wire columns and rows of the NI 2529:

TB-2635

The National Instruments TB-2635 configures the NI 2529 high-density matrix switch as an 8x16 (2-wire) matrix. It provides direct signal wire connections to the screw terminals inside the terminal block.

The figure below outlines the main components of the TB-2635:

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The figure below clearly outlines how the screw terminals on the TB-2635 map to the 2-wire columns and rows of the NI 2529:

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Signal Connection with Terminal Blocks

The NI 2529 is made up of two banks of matrices which individually have 4 rows and 16 columns. The TB-2634 and TB-2635 determine how these two banks are arranged in respect to each other and thus their corresponding topology.

TB-2634

The TB-2634 will be used with the NI 2529 when a 2-wire 4x32 matrix topology is required.

In this topology the columns, rows and banks are arranged as follows:

Below is an actual image of the TB-2634 outlining the various connections:

Connecting signals to the TB-2634 involves using ribbon cable sockets. The vendors of compatible sockets can be seen on the following table:

A low-profile ribbon cable socket will be required to connect signals to columns 0-15, columns 16-31 and rows 1-4 respectively.

The ribbon cable itself is standard 16-lead ribbon cable and can be found at most common electronic supply store.

In the image below, a low-profile ribbon cable socket has been connected to columns 16-31 of the TB-2634:

To connect signals to the NI 2529 via the TB-2634, attach low-profile ribbon cable sockets (with corresponding ribbon cable) into the desired set of columns and rows. Ensure that the ribbon cables are properly reinforced by the strain relief bar, and then attach the terminal block cover. The terminal block can then be connected directly to the switch via the mating connectors as shown in the following figure:

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In 2-wire 4x16 Matrix topology, the columns, rows and banks are arranged as follows:

To utilize the NI 2529 in 2 -Wire Dual 4x16 Matrix Topology, eight surface mount zero Ohm resistors must be de-soldered and removed from the board. These resistors are outlined in the following figure:

The signal connection procedure is then identical to the TB-2634 for 2 -wire 4x32 matrix topology.

TB-2635

The TB-2635 will be used with the NI 2529 when an 8x16 matrix topology is required.

In this topology the columns, rows and banks are arranged as follows:

Below is a actual image of the TB-2635 outlining the various connections:

To connect signals to the NI 2529 via the TB-2635, screw in the 2-wire leads into the corresponding rows or columns as required, ensure that the leads are properly reinforced by the strain relief bar and then attach the terminal block cover. The terminal block can then be connected directly to the switch via the mating connectors as shown in the following figure:

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Custom Termination Options for the NI 2529

The NI 2529 can also be utilized without either the TB-2634 or TB-2635.

By using a compatible mating front panel connector, users can develop their own terminal block. A custom terminal block can connect and arrange any of the rows and columns of the two banks of the NI 2529 as required. The connector used on the NI 2529 is 100-Pin HDI.

Below is a figure of the pinouts for the NI 2529:

Vendors of compatible mating front panel connectors can be seen on the following table:

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