The portable digital signal collector is a multi-interface data acquisition instrument which is developed by Huachang Science and Technology and integrates data acquisition, storage, analysis and customization. With the humanized interface and the operation interface, operation is simple and reliable. It has built-in mass memory, which can store more than 60000 pieces of data. The RS232 andRS422 buses are supported for data acquisition. It also supports Modbus RTU protocol, double-channel SDI12 bus and double-channel PWM count measurement. Open script development interface makes it easy for users to achieve system integration or secondary development.