Communication protocol converter mainboard for safety monitoring system of bridge girder erection machine

The utility model discloses a communication protocol converter mainboard for a safety monitoring system of a bridge girder erection machine, which comprises a lower layer plate, an upper layer plate is fixedly mounted at the upper end of the lower layer plate, and vertically through positioning holes are formed in four corners of the upper end of the upper layer plate. A power supply circuit, a main control circuit, an indicating lamp circuit, an Ethernet communication circuit and a CAN communication circuit are arranged between the lower-layer plate and the upper-layer plate, a power supply is arranged at the right upper part of the upper end of the upper-layer plate, a chip is arranged at the right middle part of the upper end of the upper-layer plate, and an indicating lamp is arranged at the middle upper part of the upper end of the upper-layer plate; a network interface is arranged at the left lower part of the upper end of the upper-layer plate, and a dial switch is arranged at the middle lower part of