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:
Classification and cause analysis of lithium battery explosion
Last article:Bluetooth GPS Disadvantages
Next article:Bluetooth GPS technology
Related Information
fleetmanagement webfleet solutions
2023-03-16realtime gps tracker online
2023-04-11Car gps tracking distributors
2023-04-23Pet GPS Tracker Vendor
2023-03-16obd2 gps tracker verizon
2023-03-16mini gps tracker manufacturer
2023-04-23real-time gps tracking Solution
2023-04-23GPS Tracker for vehicles Manufacturing
2023-03-16Dog gps tracker maker
2023-04-23Dog gps tracker manufacturer
2023-04-23G900LS-4G Car GPS Tracker
2023-10-06G500M-Mini GPS Tracker
2022-06-20G900LM-4G Car Mini GPS Tracker
2025-03-25GF30 Magnet GPS tracker with Voice listen
2022-06-21G07L 4G GPS Tracker
2022-09-06Pet intelligent positioner escort your pet security safety
2023-02-17There are three parts to the GPS plan
2022-08-12GPS China Beidou navigation satellite
2022-10-20What are the emphasis on the installation of the GPS positioner?rastreador de GPS wholesaler
2023-03-16GPS monitoring system develops rapidly.Hidden GPS Trackers Manufacturing
2023-04-18Where is the GPS positioner generally installed.gps tracker with magnet distributors
2023-04-10GPS transmission network.Hidden GPS Trackers Solution
2023-07-10Main functions of GPS.Gps speed limiter supplier
2023-08-11GPS/GPRS power-off terminal
2022-12-20Three Tips for Choosing a Reliable GPS Vehicle Navigation System.GPS Tracker for vehicles Manufactur
2023-08-08Solar GPS positioning tracker solve worries
2023-02-23Car GPS reference labeling.GPS Tracker for vehicles manufacturer
2023-05-13Brief analysis of the benefits of installing vehicle positioning system.van tracker webfleet solutio
2023-03-13Handheld GPS instrument function.simple gps tracking company
2023-07-17GPS positioning system prospects
2023-06-02