NI PXI-2532 1-Wire 4×128 Matrix Topology

The NI TB-2640 terminal block creates a 1-wire 4×128 matrix topology with the NI PXI-2532. The following figure represents the NI PXI-2532 in the 1-wire 4×128 matrix topology.

Making a Connection

Both the scanning command, r2->c1;, and the immediate operation, niSwitch Connect Channels VI or the niSwitch_Connect function with parameters r2 and c1, result in the following connection:

signal connected to R2 is routed to C1

Terminal Block Connections

The NI TB-2640 terminal block connects banks of the NI PXI-2532 to create the 1-wire 4×128 matrix topology. The following figure illustrates how the native banks of the NI PXI-2532 connect using the NI TB-2640 to create the 1-wire 4×128 matrix topology.

Bank Connection Diagram

The following tables list the pin assignments for the NI TB-2640 upper and lower column connection boards.

Upper Column Connection Board Column Pin Assignment

Lower Column Connection Board Column Pin Assignment

Row Pin Connections

The NI TB-2640 provides two ribbon cable headers for row connection. Use one cable header to connect to your application. Use the other cable header for column expansion.

The following table lists the pin assignments for row connection.

Row Protection Bypass Header

The row ribbon cable headers are isolated from the reed relays through 100 Ω resistors. To bypass these resistors, install a jumper in the appropriate position of J5 on the switch module interface board. The following table lists possible jumper locations.

Pinout

The following figure identifies the pins for the NI PXI-2532.

Caution  Low-voltage pins are reserved for future use. These pins should remain disconnected and isolated from row and column channels when high voltage is present.