The instructions for connecting signals to your NI Switch, NI Switch Cable or NI Switch Accessory can be found in the NI Switch Help, and the Cable and Accessory Installation guides.
You can find the NI Switch Help and Cable and Accessory Installation guides installed in the follow directory after installing the NI-Switch driver <National Instruments>\NI-SWITCH\NI-SWITCH Documentation, or on NI.com.
Once you have navigated to the NI-SWITCH Documentation you can open the NI-Switch Help to find the pinout for individual switch models. The pinouts can be found at NI-Switches Help>>Devices>><Switch Model>>><Topology>. For example, the pinout for the NI PXI-2510 can be seen below:
You can find guidance on how to connect your cable or front-mounted terminal block to your device, along with the pinout for the cable or front-mounted terminal block in the Installation Instructions. The Installation Instructions can be found by searching ni.com for the cable or front-mounted terminal block, or by navigating to <National Instruments>\NI-SWITCH\NI-SWITCH Documentation\Accessories and finding your cable or accessory.
The Installation Instructions will provide guidance on how to connect the cable or accessory to your device as seen below.
It will also provide guidance on the pinout of the cable or accessory and how that relates to your NI Switch module.