Zigbee คือ ?

Applications

Why ZigBee?



• Reliable and self healing
  
• Supports large number of nodes
  
• Easy to deploy
  
• Very long battery life
  
• Secure
  
• Low cost
  
• Can be used globally
  

ZigBee ZigBee Market Goals



• Global band operation, 2.4 GHz, 915 MHz, 868 MHzGlobal
  
• Unrestricted geographic use
  
• RF penetration through walls and ceilings
  
• Automatic or semiAutomatic or semi-automatic installation
  
• Ability to add or remove devices
  
• Cost advantageous
  

ZigBee ZigBee Technical Market Goals



• 10 kbps to 115 kbps data throughput
  
• 10 to 75 m coverage range
  
• Up to 100 collocated networks
  
• Up to 2 years of battery life on standard alkaline batteries
  

How Does ZigBee ZigBee Compare?



Zigbee Stack Reference Model



IEEE 802.15.4

802.15.4 Applications



• Sensors & Controls
  
• Home networking
  
• Industrial networks
  
• Remote metering
  
• Automotive networks
  
• Interactive Toys
  
• Active RFID / Asset Tracking
  

802.15.4 General Characteristics



• Data rates of 20 kbps and up to 250 kbps
  
• Star or Peer-to to-Peer network topologies
  
• Support for Low Latency Devices
  
• CDMACDMA-CA Channel Access
  
• Dynamic Device Addressing
  
• Low Power Consumption
  
• Extremely low duty-cycle (<0.1%)
  

802.15.4 Frequency Bands



IEEE 802.15.4 Device Types

Network Coordinator



• Maintains overall network knowledge; most sophisticated of thethreetypes; most memory and computing power
  

Full Function Device (FFD)



• Carries full 802.15.4 functionality and all features specified by the standard
  
• Additional memory, computing power make it ideal for a network router function
  
• Could also be used in network edge devices where the network touches other networks or devices that are not IEEE 802.15.4 compliant
  

Reduced Function Device (RFD)



• Carriers limited (as specified by the standard) functionality tocontrol cost and complexity
  
• General usage will be in network edge devices
  

Channel Division




ZigBee Network Model



Basic Network Characteristics




Topology Models


Comparison of complimentary protocols


802.15.4/ZigBee vs Bluetooth

Topology & Application

Star Networks (Personal Area Network)



• Home automation
  
• PC Peripherals
  
• Personal Health Care
  

Peer-to-Peer (ad hoc, self organizing & healing)



• Industrial control and monitoring
  
• Wireless Sensor Networks
  
• Intelligent Agriculture
  

CH (Channel) Command
The CH command is
used to set/read the operating channel on which
RF connections are made between RF modules.
The channel is one of three addressing options
available to the module. The other options are the
PAN ID (ID command) and destination addresses
(DL & DH commands).
In order for modules to communicate with each
other, the modules must share the same channel number. Different channels can be used to prevent
modules in one network from listening to transmissions of another. Adjacent channel rejection
is 23 dB.
The module uses channel numbers of the 802.15.4 standard.
Center Frequency = 2.405 + (CH - 11d) * 5 MHz (d = decimal)