Screw Terminal, 4x64, Dual 1-Wire PXI Module Matrix Terminal Block—The TB-2649 provides the necessary routing to configure the PXI-2531 or PXIe-2531 PXI Matrix Switch Module as a 1-wire dual 4x64 matrix. You can directly connect the TB-2649 to the front panel I/O connectors of the PXI-2531 or PXIe-2531.