1-Wire 4×128 Topology

Module software name: 2532/1-Wire 4x128 Matrix (NISWITCH_TOPOLOGY_2532_1_WIRE_4X128_MATRIX)

Hardware Diagram

The NI TB-2640B terminal block creates a 1-wire 4×128 matrix topology with the module.

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-2640B terminal block connects banks of the module to create the 1-wire 4×128 matrix topology.

Column Pin Connections

The following table refers to the J13 connector on the NI TB-2640B.

The following table refers to the J12 connector on the NI TB-2640B.

The following table refers to the J3 connector on the NI TB-2640B.

The following table refers to the J2 connector on the NI TB-2640B.

Row Pin Connections

The NI TB-2640B 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

Each row signal is isolated from the reed relays through a 100 Ω resistor. To bypass this resistor, install a jumper on the appropriate pins of the header indicated in the table below. The following table lists the appropriate jumper position for bypassing the resistor on each row signal.