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XBEE in API mode
PRESENTED BY : NIKUNJ GANDHI (200811013) VARUN KUMAR DWIVEDI (200811011)
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XBEE RADIO’S
“DON’T TELL ME ABOUT THE TECHNOLOGY
TELL ME ABOUT THE APPLICATION”
- -- TOM
XB EE in API mode PRESENTED BY : NIKUNJ GANDHI (200811013) VARUN - - PowerPoint PPT Presentation
XB EE in API mode PRESENTED BY : NIKUNJ GANDHI (200811013) VARUN - - PowerPoint PPT Presentation
XB EE in API mode PRESENTED BY : NIKUNJ GANDHI (200811013) VARUN KUMAR DWIVEDI (200811011) 1 XB EE RADIOS D ONT T ELL M E A BOUT T HE T ECHNOLOGY T ELL M E A BOUT T HE A PPLICATION --- TOM 2 W HATS T HE A PPLICATION? Design
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WHAT’S THE APPLICATION?
Design and develop a multi-channel, wireless
communication system for the purpose
- f
modifying toys for children with disabilities
Switch XBee M odule Picaxe Toy Picaxe XBee M odule
XBee Protocol
- Fig. 1. Application of XBEE Protocol
http://www2.hawaii.edu/~allencha
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WHAT’S THE APPLICATION? Cont…
Parking lot automation Energy management solution Solution for building insurance Limitations in those applications
1) Bandwidth 2) Radio range
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WHAT’S THE TECHNOLOGY?
What do we want from Technology?
Guarantee for the high reliability Protects against network intrusion Long wireless range Low power Compact Extensive option of controlling and reducing
battery drainage.
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WHAT’S THE TECHNOLOGY? Cont..
Fig 2.1. Official Bluetooth logo
Fig 2.2. Official Wi-Fi logo
Fig 2.3. Official Zigbee logo
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COMMUNICATION USING XBEE ..
- Fig. 3. Internal data flow diagram
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COMMUNICATION USING XBEE Cont..
XBEE module support both transparent & API
serial interface.
When operating in transparent mode, the
modules act as a serial line replacement. It
- perates in a similar way to e.g. modems.
The communication done by AT mode is either
a fixed, single target or broadcast.
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COMMUNICATION USING XBEE Cont..
The major problem in AT mode :-
2.
For each module to communicate, a target 64 bit and 16 bit address has to be set at the module.
3.
The change of these addresses, however, can be only done in the command mode.
4.
That means rapid changes of transmit destinations are not possible, because there is the requirement of total over 2 seconds of the silence before entering command mode.
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COMMUNICATION USING XBEE Cont..
AT mode can be used in mainly point to
point links, such as remote controls for TV or any other applications where XBees can act as a replacement of serial
- cable. But in addition to that, it is
possible to use it for sensors that are reporting their status to a single master.
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COMMUNICATION USING XBEE Cont..
XBEE operation modes : -
- Fig. 4 Modes of Operation in XBEE
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COMMAND MODE
In a command mode, command can be issued to configure the device, retrieve the device configuration or run a network discovery
To access the command mode, there has to be one second of silence, then sequence of three pulses (+++) has to be sent within one second and than another one second of silence is required.
On entering command mode module sends ‘OK\r’ to UART.
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AT COMMAND FORMAT
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API OPERATION
API is the more sophisticated option of
the communication with the module.
API firmware uses structured packet
interface to communicate via UART.
Data wrapped together with commands,
addressing and status information.
API allows programmer’s ability to
change the parameters without entering into command mode.
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API OPERATION (cont..)
There are two modes of API operation
2.
Standard (AP = 1)
3.
Escaped (AP = 2)
- Fig. 5. Data frame structure (AP = 1)
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API OPERATION
When sending or receiving a UART data
frame, specific value must be escaped so they do not interfere with data frame sequence.
- Fig. 6. Data frame structure (AP = 2)
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API TYPES
The
cmdID frame (API Identifier) indicates which API message will be contained in the cmdData frame (identifier specific data).
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API TYPES
Modem status :- API Identifier :- 0x8A RF module status messages are sent from the
module in response in response to specific conditions.
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REMOTE CONFIGURATION
Any device running on API is capable of
configuring any remote device within its current PAN.
This is done by sending a ‘Remote AT
Command Request’.
If the acknowledge is requested, the
remote node will reply with ‘Remote Command Response’ frame.
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