Online Development Notebook > Index > Programming Overview > DLL Commands > DevicePID

DevicePID - Return the device product ID


This is a USBm.dll function that returns the Product ID from a USB device (0x0191 for U401).

Command Syntax:

number USBm_DevicePID( device )

The USBm_DevicePID function syntax has these parts:

Part Description
device Valid device from 0 to the maximum number of devices found (minus 1) . Any other number results in a FALSE return.


Note: USBm_DevicePID returns FALSE for an invalid device, otherwise the return value is the device PID

Product ID  0x0191 = U401

Product ID  0x01A5 = U421

Product ID  0x01C3 = U451

VB Declaration (USBmAPI.bas)

Public Declare Function USBm_DevicePID _
    Lib "USBm.dll" _
        (ByVal device As Byte) _
    As Integer

VB Example

Dim result As Integer

    result = USBm_DevicePID

This code fragment shows that result is loaded with the PID of the device, or with FALSE if the device does not exist.

C Prototype

int USBm_DevicePID( unsigned char device );

C Example


DID, PID, VID, Mfr, Prod, Serial Number, and Firmware Version are all handled by the RobotBASIC function usbm_DeviceSpecs(ne_DeviceNumber).


Returns a string that contains information about the device. There are 7 sections seperated by the | character. You can use the Extract() function to extract each section seperately if desired. The sections are:






Serial Number

Firmware Version

Hardware:  U401 USB Interface    U421 USB Interface   U451 USB Interface

Programming:  USBm DLL Programming    Download Files

Application Notes:  U4x1 Application Notes    Misc Applications and Information    FAQ

While every effort has been made to make sure that the information posted on this site is correct, the author can not be held liable for any damages whatsoever for losses as a result of the application of this information. Use this information at your own risk.

USBmicro can design your custom and semi-custom USB product. Email about USB design can be directed to " Robert " at

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