Remote firmware programming method and system for data communication gateway machine

The invention discloses a remote firmware programming method and system for a data communication gateway machine, belongs to the technical field of industrial personal computers, and aims to solve the technical problem of how to simultaneously program a single chip microcomputer and an FPGA (Field Programmable Gate Array) under the condition of not influencing the structure and the function of an original circuit. According to the technical scheme, the method comprises the steps that a network cable is externally connected through an external network port, a network signal is converted into a USB signal through a network port-to-USB circuit, then the USB signal is converted into a JTAG signal and a UART signal through a USB switching circuit, the JTAG signal and the UART signal are sent to a JTAG interface of an FPGA and a UART interface of a single-chip microcomputer respectively, a corresponding MCU is provided with corresponding pins, and the JTAG interface of the FPGA and the UART interface of the single-