Two instances of the same hardware

[Anonymous]

 Hi, if two identical FX2-based devices are plugged into the PC, how can I discern one from the other? I do not have the ability to do this in the EEPROM. But as I look through the USB Properties in Device Manager, I see Address is set differently for each device (right click on USB device, go to details, then property = address)

   

However, this doesn't seem to coincide with the value I get when I look at the device property USBAddress 

   

Can someone shed some light on this? What is the best way to communicate with two identical devices connected to the same PC? 

       

Thanks

[Anonymous]

Hi, 

   

     Can you tell us more about your project implementation so that we can help you out. Why cant you use different PIDs?

   

Thanks

   

Prajith

[Anonymous]

 The device is a USB voltmeter. The user might want to have one connected, or 4 connected. It doesn't make sense ot have different PID for each.

[Anonymous]

You can add serial number string descriptor. Use the serial number to identify the device you're interacting with.

   

Regards,

   

Anand