Microcontroller of 51 series is applied in the hardware and the underwater buoy communicates with the receiving and processing system of the land station by RS-485 serial interfaces.

The hardware of the interface between single-chip microcomputer and multi-channel dual slope A/D converters and the software of processing serial input data in the system design is introduced.

A design method of data test system based on GM8123 is provided, which applies serial port expansion technologies to realize data transfer, acquisition and processing with high speed.