product description: The SERVO42C closed-loop motor is a product independently developed by the Maker Base to meet market demand. The closed-loop motor feeds back the rotation angle of the stepper motor to circuit to detect whether every step that should be taken is taken, in order to prevent missing steps. If a lost step occurs and the loop is closed, the motor make up for it through the feedback information. When a step is lost, the blue LED light on the closed-loop module light up (the blue LED light is the lost step indicator light). It is suitable for 3D printer manufacturers with high mass production accuracy requirements. Product features: 1. Support FOC vector control, three-loop control of torque, speed and position. 2. Supports direct serial port control, reading position and status, and setting system parameters. 3. Supports one-click setting of system parameters on the screen and automatic saving, which can completely the host computer. 4. Power-on self-test, automatically