Product Overview

The National Instruments cDAQ-9185 is a four slot CompactDAQ chassis with Time Sensitive Networking (TSN) Ethernet connectivity. It is designed to hold up to four C Series I/O modules and to connect them to a host computer or network through TSN enabled Ethernet. The chassis provides power, communication, and timing resources for the installed modules and supports synchronized distributed measurement.

The cDAQ-9185 is part of the NI CompactDAQ platform, which is known for modular signal conditioning and quick system assembly. Engineers select C Series modules for the signal types they need, install them in the chassis, and configure the system in software. The TSN capability allows multiple chassis and devices to share a synchronized time base over standard Ethernet infrastructure.

Time Sensitive Networking

Time Sensitive Networking is a set of Ethernet standards that provides deterministic communication and time synchronization over standard networks. The cDAQ-9185 uses TSN to synchronize measurements across multiple chassis without dedicated timing cables. This simplifies distributed systems where measurement points are spread across a machine, a test cell, or a facility.

Synchronized timing is important when data from different locations must be compared in time. TSN allows chassis to share a common time reference, which supports correlated measurement across channels and locations. Engineers should confirm the TSN configuration and network switch requirements for the planned system.

Four Slot Modular I/O

The chassis accepts up to four C Series modules, allowing a mix of analog input, analog output, digital I/O, counter, and communication modules in one system. Module types can be matched to the sensors and actuators in the application, which keeps wiring organized and reduces the number of separate instruments required.

Each module is recognized by the software and can be configured for range, sampling, and scaling. Synchronization across modules is handled through the chassis timing resources, so analog, digital, and counter data can be compared in time. This is important in applications that correlate mechanical, electrical, and thermal measurements.

Network Communication

The cDAQ-9185 uses Ethernet for communication with the host computer and other network devices. Ethernet is widely available in laboratories, factories, and test facilities, so the chassis can often be connected using existing network infrastructure. The network connection allows the host to be located away from the measurement point.

Engineers should plan network addressing, cabling, and access control so that the chassis can be reached reliably without exposing it to unnecessary network traffic or security risk. For deterministic data transfer, the network should be configured with adequate bandwidth and TSN capable switching. Sustained data rates should be validated for the planned channel count and sample rate.

Installation and Environmental Considerations

The cDAQ-9185 is designed for bench top and industrial use. It should be mounted where airflow is adequate and where the operating temperature range is respected. The chassis should be protected from moisture, dust, and excessive vibration beyond its ratings. Cable routing should avoid strain on connectors and should keep signal cables away from high current power conductors.

Proper grounding and shielding help maintain measurement quality. Engineers should follow the module and chassis documentation for shield termination and grounding. In industrial cabinets, DIN rail mounting and organized cable management improve serviceability and reduce the chance of accidental damage during maintenance.

Typical Applications

• Synchronized distributed measurement across multiple chassis

• Machine and test cell monitoring with TSN timing

• Bench top data acquisition with modular I/O

• Laboratory test setups with mixed signal types

• Industrial cabinets with networked DAQ

• Systems requiring deterministic Ethernet communication

The cDAQ-9185 provides a four slot CompactDAQ chassis with TSN Ethernet communication. Its synchronized timing and modular I/O make it suitable for distributed measurement applications where multiple chassis must share a common time reference.