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Three Ways to Ensure 802.15.4 Security Security is always a concern.  The above pairing process follows the security techniques outlined in IEEE 802.15.4. When registration is activated, the monitor provides the switch with several pieces of information. The first is the monitor’s individual 16-bit network identification number, which the monitor chooses at power-up to avoid conflict with other networks in the vicinity. The second is a unique 16-bit address for the switch, which the monitor creates. The third piece of information is a 128-bit encryption key that the pair will use to encode future communications. Once the information is exchanged, the switch and monitor use it to address and encode the signals they exchange. The combination of addressing and encryption ensures the uniqueness and security of each switch’s communications channel. No two monitors have the same network address, so monitors and switches will not respond to signals originating in other networks. A monitor will not confuse signals within its network, nor will switches respond to signals intended for other switches. No switch has another switch’s address, so switches will not react to one another’s signals. Even if an addressing error occurs somewhere, the network will not react to the erroneous signal because the encryption keys for decoding the message will not match. The use of encryption further ensures that no unregistered node can successfully insert erroneous signals into a network or decode signals from a network, making the network secure from both eavesdropping and hacking. Once a switch and monitor have been paired, the two continually exchange information as long as both have power. The switch sends a switch position message to the monitor each time the position changes, accompanied by a health” status message that indicates battery level and RF signal strength. In addition, the switches send out health status” messages at regular intervals. This interval is typically 30 seconds but is configurable to meet specific installation needs; shorter intervals can reduce battery life. Using a 802.15.4 radio network to connect limit switches to a central controller frees industrial equipment developers and users from the costs and restrictions of wired switch solutions and expands the range of possible uses and placement of switches. It also reduces the wire complexity within a control cabinet. The commissioning and lifetime cost of switches drops while reliability and integrity rise.   About the Author Todd Hanson is a Director of Strategic Marketing and Wireless Solutions at Honeywell Sensing and Control (S&C). In this role, Todd is responsible for S&C’s wireless solutions as well as the overall S&C industrial business. He actively collaborates with other Automation and Control Solutions businesses to formulate a One Honeywell strategy where S&C supports the other businesses to help drive total Honeywell solutions.

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IMEC and Wipro have formed a joint initiative called ARISE for Applied Research in Intelligent Systems Engineering (ARISE). This is expected to bring together systems designers, architects and software engineers to develop nanoelectronics and nanoelectromechanical systems (NEMS) useful for emerging markets such as India.

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