RFGPIB vs VXI: A Detailed Comparison of Instrument Interfaces
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This page outlines the fundamental differences between GPIB (General Purpose Interface Bus) and VXI (VME eXtensions for Instrumentation) interfaces. We’ll also touch on other instrument interfaces for a broader understanding.
GPIB Interface
The GPIB interface is designed to connect computers, instruments, and other peripherals. It’s a versatile interface, carrying both data and control information between connected devices.
To use GPIB, you’ll typically need a GPIB adapter to provide the necessary connectivity. One GPIB interface can handle approximately 14 devices, achieving a maximum data transfer speed of around 200 Kbps. This makes it suitable for applications where distances are relatively short.
VXI Interface
The VXI interface builds upon the VMEbus architecture, offering advantages over GPIB in terms of size and integration. It allows for more compact and integrated systems.
However, as it relies on older PC architecture, VXI doesn’t fully capitalize on the advancements found in modern PC technologies.
| Specifications | GPIB | VXI |
|---|---|---|
| Width of Bus in bits | 8 | 8/16/32 |
| Data throughput | 1 OR 8 Mbytes/second | Max. 160 Mbytes/second |
| Synchronization | Not required | Defined in the specifications |
| Size | Large | Medium |
| Software framework | Not needed | VXI plug and play |
| Modularity | Not supported | Supported |
| EMI shield | Optional | Defined in the spec. (All modules need metal shield) |
| Cost of the system | Higher | Medium to High |
