VISA library for C++

[David882563]

Hello, I want to scan all devices connected by LAN. So I used function viFindRsrc.

 /*
* Find all the VISA resources in our system and store the number of resources
* in the system in numInstrs. Notice the different query descriptions a
* that are available.
Interface Expression
--------------------------------------
GPIB "GPIB[0-9]*::?*INSTR"
VXI "VXI?*INSTR"
GPIB-VXI "GPIB-VXI?*INSTR"
Any VXI "?*VXI[0-9]*::?*INSTR"
Serial "ASRL[0-9]*::?*INSTR"
PXI "PXI?*INSTR"
All instruments "?*INSTR"
All resources "?*"
*/

But only these INSTR can be found, no tcp devices found.

How can I handle this problem?

Thanks!

[rolfk]

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@David882563 wrote:

But only these INSTR can be found, no tcp devices found.

How can I handle this problem?

---

Unless it is a VXI-11 compatible device, there is no way VISA can detect them. TCP/IP does not contain a standard method to discover devices. There are almost a zillion different methods that the various devices implement from Bonjour to Windows Plug and Play, LanManager, NetBEUI. ZeroConfig, etc. etc. If VISA tried to implement even a fraction of them, its development would never have been finished and a network scan could last hours before it has gone through all of them. The VXI-11 standard also foresees a discovery service and VISA supports that if a device supports it. Otherwise you have to consult the device documentation to see what discovery services it supports and implement one of them yourself.