To easily wire sensors and signals to your terminal block, leverage the published documentation and information in this guide. Here are the basic steps to designing your measurement circuit diagram, understanding pin mapping, connecting your wiring, and configuring your terminal block. Failure to set up your terminal block properly may lead to no readings, unexpected readings, noisy readings, or possible damage to your terminal block, device, or module.
- The general concepts of pin mapping and pinouts are covered in the Digital Instrument Accessory Guide Main Page. Note, a common point of confusion for normal wiring is the need to first understand the cable mapping, or pinout at the connector found on your terminal block, which is not the case.
- The Connection Guide and Specifications for the SCB-68 HSDIO are provided in the Quick Specifications and Published Resources section above. These contain pinout or pin mappings, guidance on how to populate the optional SMB Connectors, and also extended information for configuring your terminal block in the various modes that it supports, and extending its functionality.
- It is also important to consider using shielded signal wires, shielded cables, and ensuring that the terminal block itself has been correctly grounded. National Instruments recommends using 50 Ω cables for all signal connections. If you do not use 50 Ω cables, your application may be affected by signal reflections. You can limit the amplitude of signal reflections by terminating output lines with Schottky diodes. For more information terminating Output Lines with Schottky diodes see the Connection Guide provided in the Quick Specifications and Published Resources section above .
- The breadboard on your SCB-68 HSDIO can be used to add SMB connectors The Connection Guide referenced contains detailed information on when to do these setups, how to configure them, and other details like soldering and desoldering information.
- Once you've completed your wiring, make sure to finish by tightening the strain relief bar to ensure that your wires can not easily pull out from your terminal block.