When wiring your sensor or other signals into your NI accessory it is important to understand which screw terminal or BNC connectors map back to which terminals or pin numbers on your NI DAQ device. For accessories not covered in the extended information pages from this guide, this guidance generally applies to mapping any NI device's lines to the accessory.
If your device has extended information available in this guide, there may also be additional information on its DAQ Accessory Guide page.
First, it is important to understand that each device may use its own pinout or pin mapping scheme. Some families of devices with the same pin count will use the same numbering and signal combinations, but others may not. There are several resources you can use to find this scheme.
- Quick Reference Pinout Labels - If available, this is the easiest and quickest way to find your signal mapping. NI recommends that you print out and attach the quick reference label to your accessory.
- User Manuals and User Guides - You can find your model's pinout in its user manual or user guide. Search NI Manuals to find your model's user manual or user guide.
- NI-DAQmx Help - The NI-DAQmx Device Terminals Help section contains the pinouts for every hardware model supported by that version of the driver. The NI-DAQmx Help installs locally with your driver, and is also available online.
- Measurement & Automation Explorer (MAX) - NI MAX is used to configure your NI DAQ hardware, and also references out to many different types of reference information, including device pinouts.
- Right-click your device name under Devices and Interfaces, and select Device Pinouts to directly navigate to the NI-DAQmx Device Terminals Help topic for your device.
- Right-click the device name under Devices and Interfaces, and select Help»Online Device Documentation. A browser window opens to ni.com/manuals with the results of a search for relevant model documentation.
- All accessories, with the exception of PXI front mounted blocks, connect to a device or module through a cable. Unless you are creating a custom breakout box or test fixture, it's typically unnecessary to understand the pin mapping at each cable and device connector. Instead, you can take the above information in regards to the signal mapping, and use that to wire to the labeled numerical screw or BNC terminals once you have connected your cable. If you'd still like to review connector pinout or mapping for NI DAQ cables, check out the NI DAQ Cables Guide.
SCB-68A to PCIe/PXIe-6361 Pinout Mapping Example
Warning: Always refer to the product documentation for your specific device. Your device may use a completely different pin mapping than what is used in this example.
Navigate to the PCIe/PXI-6361 entry in the NI-DAQmx Device Terminals Help using one of the methods described above to find the following pinout diagram.
In this example, we want to connect our differential signal, AI 0. Since our differential signal requires two wires for signal and COM, we will use the differential signal names designated in parentheses. In this case, pin 68 of the PCIe/PXIe-6361, denoted by AI 0 (AI 0+), will be our signal connection; the COM will connect to AI 8 (AI 0-) at pin 34.
Figure 1: PCIe/PXIe-6361 Pinout with Pin 68 (AI 0+) and Pin 34 (AI 0-) Highlighted
On the SCB-68A we find terminal 68, to which we can wire our AI 0+ signal wire to, and secure through the screw terminal. Similarly, we find terminal 34 to which we can wire our AI 0- signal.
Figure 2: SCB-68A with Terminals 68 and 34 Highlighted