If you have designed or thinking to design a board using any of SIM800 modules then it would be wiser to leave out the above mentioned USB lines to a USB connector. ![]() USB Interface: Faster, Needs 3 lines of SIM800 module, USB_DN, USB_DP, USB_VBUS and GND connection UART Interface: Slower, Needs 3 lines of SIM800 module, UART_TX, UART_RX, PWRKEY and GND connection Updating firmware through USB: For updating the firmware through the USB lines of SIM800 we need to connect the USB data lines ( USB_DN, USB_DP) and USB power line ( USB_VBUS) to a PC or laptop using a USB connector. Pre-requisites: First download the tools, files and documents used for the firmware update from the below links, Firmware update methods: We can program a new firmware image to our SIM800 module using either UART interface or USB interface. Articles from Air Conditioning, Heating & Refrigeration News May 2002 on HighBeam Research. Hantech Siso Markus-800 Manual Average ratng: 9,7/10 1676reviews.
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