source:truck tracking webfleet solutions release time:2022-10-19 Hits: Popular:realtime gps tracker online
Before the connection in the piconet is established, all devices are in standby state. In this mode, the unconnected unit periodically "listens" for information every 1.28 seconds. Every time a device is activated, it monitors 32 frequency hopping points planned for the unit. The number of frequency hopping points varies according to different geographical regions. The number 32 only applies to most countries except Japan, France and Spain. The master device first initializes the connection program. If the address is known, the connection is established through a page message. If the address is unknown, the connection is established through an inquiry message followed by a page message. In the initial paging state, the master unit will send a string of 16 identical page messages on the 16 frequency hopping points allocated to the paged unit. If there is no response, the master will continue paging on the remaining 16 frequency points in the activation order. The maximum delay time for Slave to receive messages from the master is twice the activation cycle (2.56 seconds), and the average delay time is half of the activation cycle (0.6 seconds). Inquiry messages are mainly used to find Bluetooth devices, such as shared printers, fax machines and other similar devices with unknown addresses. The inquiry message is very similar to the page message, but the inquiry message requires an additional data string cycle to collect all responses.
If the connected device in the piconet does not transmit data for a long time, Bluetooth also supports the energy-saving mode. The master can set the slave to hold mode. In this mode, only one internal counter is working. Slave can also actively request to be set to hold mode. Once the cell in hold mode is activated, the data transfer starts again immediately. Hold mode is generally used for connecting several piconets or low energy consuming devices, such as temperature sensors. In addition to the hold mode, Bluetooth also supports two other energy-saving working modes: sniff mode and park mode. In sniff mode, slave reduces the rate of "listening" messages from the piconet, and the "breathing" interval can be adjusted appropriately according to application requirements. In park mode, the device is still synchronized with the piconet without data transmission. The device working in park mode gives up the MAC address, occasionally listens to the master message, resumes synchronization, and checks the broadcast message. If we rank these working modes in ascending order according to energy saving efficiency, then they are: breathing mode, holding mode and pause mode.
Read recommendations:
Last article:Bluetooth GPS Disadvantages
Next article:Bluetooth GPS technology
Related Information
4G GPS Tracker Factory
2023-04-23fleet gps tracking wholesaler
2023-04-23gps vehicle tracker Manufacturing
2023-04-23GPS Trackers sales
2023-04-11real-time gps tracking wholesale
2023-04-23Dog gps tracker maker
2023-04-234G GPS Tracker for vehicles Production
2023-04-23car gps tracker Vendor
2023-04-23Car gps tracking Processing
2023-04-23realtime gps tracker online
2023-04-11TK200AM-Disposable GPS Tracker
2022-06-21TK100B- Accurate Pro version GT06/TK100
2023-10-06YG119- Hunting Dog GPS tracker
2023-10-074G Wired GPS Tracker PCBA
2022-06-17VSL100 GPS Speed Limiter, Speed Governor
2022-06-19Components of a GPS system
2022-08-20Introduce the different types of navigation positioning performance testing methods.GPS Tracker for
2023-05-09What should I pay attention to when purchasing GPS products?
2022-11-24Five requirements that a good GPS module must meet
2022-11-07Da GPS tells how to prevent car theft
2022-08-25The relationship between GPS and Beidou navigation?Asset tracking wholesaler
2023-02-18GPS receiver work principle.gps tracker no monthly fee Manufacturing
2023-04-23Bluetooth GPS
2022-10-10The manufacturer summarizes all the functions of the monitoring system
2023-05-09GPS navigator component-is a car navigation system
2023-05-16Recommended Minimum Specific GPS/TRANSIT Data (RMC) GPS recommended positioning information
2022-09-28CDMA mobile phone GPS positioning
2022-10-21GPS Navigation Solver
2022-09-06Electric car is equipped with GPS positioning function and recovered the same day after being stolen
2022-08-11GPS coordinate
2022-11-23