The NI cDAQ-9181 is a 1-Slot Ethernet CompactDAQ Chassis. It serves as the foundation for small, distributed sensor measurement systems.
Key Details
Model Name: cDAQ-9181
Type: CompactDAQ Ethernet Chassis
Slot Count: 1-slot
Connectivity: Ethernet (RJ-45 connector)
Function: Controls the timing, synchronization, and data transfer between a single C Series I/O module and an external host computer.
Specifications (Key Parameters)
| Parameter | Value/Description |
| Number of Slots | 1 |
| Connectivity | 10/100BASE-T Ethernet |
| Data Throughput | Up to 10 MS/s (depending on C Series module) |
| Integrated Counters | Four 32-bit general-purpose counter/timers |
| Synchronization | Network-based, supporting distributed measurements |
| Power Requirements | 9 VDC to 30 VDC |
| Operating Temperature | -20 °C to 55 °C (-4 °F to 131 °F) |
| Relative Humidity | 10% to 90%, noncondensing |
| Software Support | NI-DAQmx Driver Software |
✨ Product Advantages (Key Benefits)
1. Flexibility and Versatility
Modular I/O: The single slot can accept any of the hundreds of NI C Series I/O modules, allowing you to mix and match measurement types (e.g., analog input, digital I/O, temperature, strain, voltage) in a single compact system.
Scalability: While it's a 1-slot system, you can easily synchronize multiple cDAQ-9181 chassis over the Ethernet network for distributed, high-channel-count applications.
2. Distributed and Remote Measurement
Ethernet Connectivity: Allows for remote data acquisition, placing the measurement system close to the sensors and far from the host PC. This minimizes the length of analog cables, improving signal fidelity and reducing noise.
3. Compact and Rugged Design
Small Footprint: Its compact size makes it ideal for portable or space-constrained applications.
Industrial-Ready: The chassis is designed for demanding environments with a wide operating temperature range and high shock/vibration ratings.
4. Integrated Counter/Timers
The inclusion of four 32-bit counter/timers allows for applications involving quadrature encoders, PWM generation, event counting, and frequency measurement without needing a dedicated counter module.
⚠️ Important Considerations (Precautions)
Single Module Limitation: As a 1-slot chassis, it is best suited for small, dedicated, or distributed applications. If you need a dense, multi-channel solution in one location, a chassis with more slots (like the cDAQ-9185 or cDAQ-9189) would be more appropriate.
Software Dependency: Requires the NI-DAQmx driver software to interface with the host PC and program the measurement tasks, typically through NI LabVIEW, C/C++, or Python.
Network Reliability: Since it uses Ethernet, reliable network connectivity is essential for continuous data logging and monitoring.
