ST300 controller is a digital controller produced by Mitsubishi. It has a single-loop control function and can receive K, J, E, T, R, B, S, L, N, U, W, Platinel Ⅱ RTD type sensors. It also supports 4~20mA current input and can output 4~20mA current and switch output. It supports MODBUS communication protocol and can be set and controlled by PC.