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1-800-LOGGERS (564-4377) • 508-759-9500 

www.onsetcomp.com/support/contact 

© 2016–2018 Onset Computer Corporation. All rights reserved. Onset, HOBO, and HOBOware are registered trademarks of 
Onset Computer Corporation. All other trademarks are the property of their respective companies. 

This product has been manufactured by Onset Computer Corporation and in compliance with Onset’s ISO 9001:2015 
Quality Management System. 

20874-D MAN-QSG-H21-USB 

 

 

3

 

Set up HOBOware. 

Even though this logger uses a USB cable to communicate with HOBOware, the software and computer must 

be configured for a serial COM port for each H21-USB station (even if your computer does not have a serial port). HOBOware 
3.7.11 or later is recommended.

 

If you need to install or upgrade HOBOware: 

a.

 

Connect the logger to the computer with the USB cable. Device hardware drivers will be installed automatically the first 
time an H21-USB logger is connected. This may take a few minutes to complete. 

Important:

 The computer must be connected to the Internet while the device hardware drivers are being installed. 

Device drivers only need to be installed once per computer. If you need to use another computer with an H21-USB 
Micro Station, you will need to repeat this installation. Contact Onset Technical Support at 
www.onsetcomp.com/support/contact if you encounter any problems with device hardware driver installation. 

b.

 

Download HOBOware at www.onsetcomp.com/hoboware-free-download and install the software. 

c.

 

When the HOBOware Setup Assistant appears, select “USB and serial devices” for the device types. A COM port should 
be listed. Complete the remaining Setup Assistant steps and click OK. 

If HOBOware is already installed: 

a.

 

Connect the logger to the computer with the USB cable. Device hardware drivers will be installed automatically the first 
time an H21-USB logger is connected. This may take a few minutes to complete. 

Important:

 The computer must be connected to the Internet while the device hardware drivers are being installed. 

Device drivers only need to be installed once per computer. If you need to use another computer with an H21-USB 
Micro Station, you will need to repeat this installation. Contact Onset Technical Support at 
www.onsetcomp.com/support/contact if you encounter any problems with device hardware driver installation. 

b.

 

Open HOBOware. From the File menu (Windows) or the HOBOware menu (Macintosh), select Preferences. 

c.

 

In HOBOware Preferences, select Communications. Click Device Types and make sure “USB and serial devices” is 
selected. 

d.

 

Click Serial Ports. A new COM port is listed under Serial Ports, which will be used for the Micro Station. Make sure the 
box next to the new COM port is checked. 

e.

 

Click OK in Preferences. 

Note

: If you are using a version of HOBOware prior to 3.7.10, you may need to enable a COM port in Preferences as described 

above each time you connect a different H21-USB to the computer. 

Launch the logger.

 

a.

 

From the Device menu in HOBOware, select Launch. 

b.

 

Select the logging interval, when to start and stop logging, and any other launch options as desired. 

c.

 

Click the Start button to load the settings to the logger. Logging will begin based on the settings you selected. If you 
configured the logger with a push button start, press the button on the logger for 3 seconds when you are ready for 
logging to begin. 

Deploy the logger.

 Refer to the product manual at www.onsetcomp.com/manuals/h21-usb for guidelines for deploying and 

mounting the logger. 

Read out the logger.

 Connect the logger to the computer with the USB cable to read it out. From the Device menu in HOBOware, 

select Readout. After the readout is complete, plot the data. 

 

For detailed specifications and information about this logger, refer to the complete product manual. Scan the code 
at left or go to www.onsetcomp.com/manuals/h21-usb. 

 

 

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