Microcontroller using AT89S52 chip is, it is the control center for the operation of the equipment. After receiving the SMS from sim module 908 through interface USART, VDK data separate information filtering content, check out the comparison table with the command codes are defaulted to control the device. If the SMS content in the control orders requested read device coordinates, VDK will send commands that require GPS sim read 908, the content returned is microcontroller handles then moved into coordinates SMS and send it back to back in 908 sim control device (mobile phone).
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