Model XW20LH-XW60LH, dimension 38*185mm, is a microcomputer controller suitable for medium and low temperature forced air cooling system. 4 relay outputs control compressor, evaporator fan, electirc defrost(or hot gas deftost), and relays with configurable outputs. It can also provide NTC or PTC probe input, the first channel is used to control the storage temperature, and the the second channel can be placed on the evaporator to control the defrost termination temperature probe. The fourth probe is used for condenser temperature alarm or display a certain temperature. The parameter list can be uploaded or downloaded list can be uploaded or downloaded through the programming key(HOT Key) interface, In this interface,by using an external communication converter XJ485CX to convert to ModBUS-RTU protocol, it can be connected to the network of DIXELL's XWEB series monitoring system. It can burn the keyboard to the controller through the hotkey. The controller provides a fully functional configurable parameter table system that can be easily programmed by the user via keypad buttons.