The Universal Serial Bus Test and Measurement Class (USBTMC) is a USB device class specification designed to allow USB-based instruments to be controlled similarly to traditional GPIB (IEEE 488) instruments. It enables programmers to use standard high-level software APIs, such as the VISA library, to control a device regardless of whether it is connected via USB or GPIB.
When a USBTMC-compliant instrument--such as a DC power supply or X-ray generator--is connected to a computer, it is recognized as a test and measurement device. The VISA software layer communicates with it directly, allowing programmers to send text-based command strings (typically SCPI commands) without managing low-level USB communication details.
Key Features and Benefits:
- Simplified Integration: Combines the physical ease of USB with the established programming standards of GPIB.
- Driver Compatibility: Works seamlessly with standard VISA layers, eliminating the need for developing custom USB drivers.
- Efficient Control: Supports industry-standard command protocols for reliable and familiar instrument management.