Regarding the different frequencies in zigbee, know the frequency bands he uses
Frequency band used by ZigBee
The mainstream is 2.4G. There are also European frequency bands, 868MHz, and North American frequency bands, 915MHz.
In most countries in the world, the use of radio equipment is to pay for frequency usage, including mobile phone communications. It's just that mobile operators or service providers have already paid this fee to the country, and have collected this fee from users in various ways.
The free frequency band refers to a frequency band allocated by various countries according to their actual conditions and considering as much as possible consistency with other countries in the world. It is used exclusively for industrial, medical and scientific research use (ISM frequency band). You need to apply and can use it for free.
The 2.4G frequency band in our country is just such a frequency band.
However, in order to ensure that everyone can use it reasonably, the state has made corresponding restrictions on the power of wireless transceiver equipment in this frequency band under different environments. For example, in an urban environment, the transmit power cannot exceed 100mW.
So what do the different frequencies in zigbee mean?
for example:
channel is 2405Mhz
This is the wireless transmission frequency of ZigBee. The frequency of the two devices communicating with each other must be the same! This is determined by the ZigBee hardware! You can choose by setting the channel!
Pan ID is 0x0628
This is the ZigBee regional ID code. If the regional ID codes are different, ZigBee communication cannot be established! This is determined by the ZigBee protocol stack! !
Working frequency is 2.4GHz
This means that in the world, the universal ZigBee frequency band is 2.4GHz, this is not strictly 2.400GHz, but several frequency bands around 2.4GHz, because ZigBee uses channel access technology, including time division multiplexing GTS technology and random Access channel technology CSMA/CA, this technology allows ZigBee to be divided into 16 channels in the 2.4~2.4835GHz area, each channel is separated by 5MHz. When communicating, select a fixed channel for transmission!
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