Of course, it would be great if someone could develop an implementation for these protocols not relying on Visa. Visa is especially interesting as it enables controlling instruments via USB (for devices compliant with the USB-TMC protocol) or TCP/IP (LXI standard) without the need to develop specific drivers. However, standard synchronous (blocking) operations are allowed too, and the code can safely and transparently handle concurrent use of both synchronous and asynchronous commands.Īs the software has been made sufficiently general to adapt it to various Gpib libraries, it could eventually also be adapted to other interfaces such as the Visa library and the serial port. Asynchronous operations are queued which makes programming very simple. This works quite well as I could easily obtain relatively high reading rates (e.g., an average of 2-3 reading/second/device for 10 devices, i.e., a total of 20-30 operations/second) even in configurations where a few devices are very slow (e.g., 2-3 seconds response time). The solution proposed in this software consists in using as much as possible the asynchronous operations where a different thread for each device is used so that the write/read operation sequences for different devices become automatically interleaved. This project originated from my efforts to obtain efficient GPIB control in an environment where some devices are slow to respond and usually create a bottleneck in the data flow. Download source - 178.5 KB (last updated 23 rd May, 2018, see History).
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