AduHidTest USB Device Test Software  Tutorial : Part 1


Note: AduHidTest software has been upgraded to version 4.0 as of February 20, 2023. The software was upgraded to facilitate the use of the pending new ADU73 and ADU816 in streaming mode, and some other minor improvements. The DLL has not been modified and remains at version

AduHidTest is a free USB Device test program used to connect to ADU data acquisition devices, and send and receive data. The program is a useful tool to allow programmers to become familiar with the operation of ADU interfaces and programming requirements. Download links are at the bottom of this page.

For this tutorial we will use an ADU200 USB Relay I/O Interface to demonstrate use of the software.


Getting Started:

There are three steps in using a USB device in any application software. The three steps are ,

  1. Obtain a handle for the USB device.
  2. Send commands to the USB device.
  3. Receive data from a USB device.


STEP 1: Obtain a handle for the USB Device ( ADU200 USB Relay I/O Interface )

A handle is a unique code that application software uses to identify a USB device for the purpose of reading and writing to the device.  A USB bus can have up to 128 devices connected to a single host and there are three criteria that can be used to open a handle. The three criteria are, Vendor ID, Product ID and Serial Number. If a single device is connected to the bus, any of the three criteria may be used.  If multiple devices are connected, we recommend using the Serial Number to open the handle ( All ADU devices have their unique serial number printed on the top label ) The AduHidTest program main Window  is shown in Figure 1.

AduHidTest USB Terminal Program 

Figure 1: AduHidTest Main Window

The Open/Close  section of the window is where the handle is determined and  there is a Show List  button in the section. Click on the Show List  button to view the devices connected to the USB bus. ( Note: Only ADU devices will be listed ) Figure 2 is the window that appears when the  Show List Button is clicked.

ADUHidTest USB Terminal Software 

Figure 2: " Show List " Display

The display indicates that we have an ADU200 device ( Serial # A53784) and an ADU228 ( Serial #  P01085) connected. Select a device by clicking on the desired device. The AduHidTest main window will now display the product ID and Serial number. Click the  By Serial # radio button and then click  Open to open the handle to the selected ADU device. Note that we could also open By Product ID as we have two different ADU devices connected.  If two of the same type of device were connected we would have to use the open By Serial# option.

ADUHidTest USB Terminal Software 

Figure 3:  Connected to ADU200 Serial# A53784

STEP 2: Send Commands to the USB Device ( ADU200 USB Relay I/O Interface)

Once connected, you may now send commands to the available "pipes" on the device. Pipes are the individual connections to functional sections of the ADU200. The Device Pipe is used to send standard ASCII ADU commands to control the peripherals built into the ADU200 such as the relay outputs or event counter inputs.   Type "sk3" ( Close relay K3 ) into the device pipe send window and click  Send ADU .   Relay K3 on the ADU200 will close and the software will display a small "OK" next to the Send ADU button indicating the command was sent.

ADUHidTest USB Terminal Software 

Figure 4:  Sending "sk3" Command

STEP 3: Receive Data from the  USB Device ( ADU200 USB Relay I/O Interface)

Some commands will cause a response to be sent  from the ADU device to the host computer. For example, if an "re1" ( read event counter 1 )   command is sent, the ADU200 will send back the 5 digit count. To read responsive commands, simply click the  Receive ADU button and the data will be displayed.

ADUHidTest USB Terminal Software 

Figure 5:  Sending "re1"  and Receiving Count Data

The RS232 Pipe is used to send and receive ASCII strings to any RS232 based device connected to the ADU200 auxiliary serial port.  The method of sending commands  is identical to device pipe, in that you simply enter the ASCII command string, and click the Send 232  button. Data is received, and then displayed when the Receive 232 button is clicked.

In the following example, an "rd" ( analog array read ) command is sent to an ADR2000B Data Acquisition Interface connected the ADU200 auxiliary serial port. Figure 6 shows the "rd" command being sent and Figure 7 shows the returned data displayed after the Receive 232 button is clicked.

ADUHidTest USB Terminal Software 

Figure 6:  Sending "rd"  Command to RS232 Pipe

ADUHidTest USB Terminal Software 

Figure 7:  Receiving Data on  RS232 Pipe

Presently, most off-the-shelf ADU devices do not support streaming functionality. The pending new ADU73 and ADU816 interface do support streaming and below is a link to continue the tutorial outlining the streaming functions along with instructions on importing and displaying data in Excel.

Click here to continue tutorial .....  AduHidTest Tutorial Part 2 - Streaming Function


DOWNLOAD AduHidTest Here:

Download AduHidTestV4.0 (64-Bit)  now, in ZIP Format ( 1.2MB ). ( Contains DLL Ver 2.2 )

Download AduHidTestV4.0 (32-Bit)  now, in ZIP Format ( 1MB ). ( Contains DLL Ver 2.2 )


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