Product Overview
The National Instruments USB-8502 is a two port CAN interface device for USB based systems. It is part of the NI-XNET family of network interfaces and drivers. The device is designed to connect a computer to high speed CAN and CAN FD networks for communication, monitoring, and simulation. It is used in automotive, industrial, and embedded system test applications.
The USB-8502 provides two CAN ports in a compact USB form factor. This makes it suitable for bench top development, vehicle network testing, and laboratory validation. The device is supported by NI-XNET software, which provides a common API for CAN and other vehicle network protocols. Engineers can use the device to send and receive frames, monitor bus traffic, and simulate network nodes.
CAN and CAN FD Communication
The USB-8502 supports high speed CAN and CAN FD communication. CAN FD extends the classic CAN protocol with a larger data payload and faster data phase, which is useful for modern automotive and industrial networks. The two port design allows multiple CAN networks to be connected at the same time or a single network to be accessed from two points for monitoring and simulation.
The device handles network communication through the NI-XNET driver, which manages frame transmission and reception, signal decoding, and database integration. Engineers can import CAN database files to work with named signals and frames rather than raw bytes. This improves development efficiency and reduces errors in network test applications.
NI-XNET Software Architecture
NI-XNET provides a common programming interface for CAN, LIN, and FlexRay interfaces. The USB-8502 uses this architecture to deliver consistent behavior across different network hardware. Applications can be developed in LabVIEW, LabWindows/CVI, Measurement Studio, and other environments that support NI-XNET. The driver handles timing, buffering, and network synchronization tasks.
The NI-XNET API supports frame based and signal based communication. Frame based communication gives direct control over CAN frames, while signal based communication uses database definitions to read and write physical values. This flexibility allows the USB-8502 to be used for low level protocol test as well as higher level system simulation and validation.
USB Connectivity and Use
The USB-8502 connects to a host computer through USB. This makes it convenient for portable test setups and laptops used in vehicle or field testing. The device can be used on a bench with a desktop computer or in a mobile setup where a PXI chassis is not practical. Proper USB cable selection and power management help maintain reliable communication.
The two port design is useful when a test system must interact with multiple CAN networks or when one port is used for monitoring and the other for simulation. The device can be synchronized with other NI hardware through software timing and trigger mechanisms where supported. This allows CAN data to be correlated with analog, digital, and other measurement data in a larger test system.
Typical Applications
CAN and CAN FD network monitoring and logging
Automotive electronic control unit test
Embedded network simulation and validation
Industrial CAN communication test
Bench top development with NI-XNET software
Multi network test using two CAN ports
The USB-8502 provides two CAN and CAN FD ports in a USB interface device with NI-XNET software support. Its dual port design, database integration, and portable form factor make it suitable for automotive, industrial, and embedded network test applications.
