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Si4463 wireless module, attention to the use of the industry the highest cost-ef

Date:2012-01-17Clicks:1413

Attention to the problem of APC320 module

Considering the complexity of the air transmission, some characteristics of the wireless data transmission mode is inherent, should consider the following issues.

1) network using APC320 module

Communication channel APC320 is half duplex, can complete a point to point, point to multipoint communication. These two ways first need to set up 1 station, the rest from the station, all sites must be set to a unique address. Communication is coordinated by the master control, main station using with address code data frame sending data or commands, all from the station all received, and will receive the address code and the address of the machine code comparison, address different data will be lost, do not respond, if the same address code, will receive the data transfer go out. Network must ensure that at any one instant, the same frequency point communication network only one station in the transmit state, so as to avoid mutual interference. APC320 can be provided with a plurality of channels, so it can be in an area to realize the multiple networks coexist.


2) delay data in wireless communication


Because wireless communication transmitter is received from the terminal equipment of a certain number of data, or wait for some time no new data began to launch, wireless communication transmitting end to the receiving end wireless communication there are tens to hundreds of milliseconds delay (specific delay is composed of serial rate, air rate and the packet size decision), in addition, from wireless communication receiving terminal to terminal equipment also need some time, but under the same conditions the delay time is fixed.


3) error control


The APC320 module has strong anti-interference ability, in the code already contains a powerful ability of correcting errors. But the field receiving in extreme conditions or have been in a critical state APC320 module receives, appears unavoidably receives less than or packet loss status. Development time customers can increase the link layer protocol of the system, such as increasing the similar TCP/IP sliding window and packet loss retransmission function, can greatly improve the reliability and flexibility of using wireless network.


4) antenna selection


Antenna is an important part of the communication system, its performance will have a direct impact on communication system of indicators, the user must first pay attention to its performance in antenna selection. In general there are two aspects, first select the antenna type; second the selection of electrical performance of antenna. Select the antenna type meaning is: the selected antenna patterns for compliance with the requirements of the radio coverage in system design; select the antenna electrical performance requirements are: selection of frequency bandwidth, the antenna gain, the rated power of electric index whether it meets the system design requirements.


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