Callbacks or Serial Number for OnReceived

[itsyoshio]

Hi there,

assuming a Setup with multiple TMC Devices, would it be possible in USBTMCAsync::OnReceived to know which Device (by SerialNumber?) the received Message is from?

further, would be possible to access received data from the Class?

Usbtmc.Run();
Usbtmc.Request("MEAS:VOLT:DC?");
// something like this?
Usbtmc.Receive(); // -> return value float 2.23 | e.g. Results in Volts from a Multimeter.

What i want to achieve is tracability or correlation from a specific request to it's response.

Thanks!

[NaoNaoMe]

Hello,

Sorry to late response.
To specify the device you want to communicate with, you can use the VID and PID of the device, like so:

USBTMC Usbtmc(&Usb, &UsbtmcAsync, 0x0957, 0x0618);

You can replace 0x0957 and 0x0618 with the VID and PID of your device. To find the VID and PID of your device, you can use a tool like lsusb on Linux, or the Device Manager on Windows. And also you can find this example:ValidationExample

As for your second question, to receive a response to a command, you can use the USBTMC_HELPER class. Here's an example code snippet:

#include <USBTMC_HELPER.h>

USBTMC_HELPER worker(&Usb,&AsyncOper);
...
String command = F("ACQ:STATE?");
worker.write(command);
String response = worker.read(1000);
if(response == "") {
 // Timetout
}
else {
 // Success: you have received the response message
}

You can find this example, along with the USBTMC_HELPER class, in this GitHub repository:TekScopeWithIRremote

I hope this helps! Let me know if you have any further questions.

[itsyoshio]

Yup, the USBTMC_HELPER was exactly what i needed. Thank you so much!