How to improve the differential pulse immunity of motion controller MC?

Improving the immunity of the motion controller's MC differential pulse signal requires fully leveraging its common-mode rejection advantage, supplemented by external protection. Select a differential receiver chip with a high common-mode rejection ratio. Use twisted-pair cable on the transmission line, ensuring a tight twist. Install common-mode chokes, such as the CML series, at both the pulse transmitter and receiver ends to further suppress common-mode interference on the line. Provide balanced drive for the differential pairs to prevent asymmetry from being converted into common-mode noise.

At the ports, provide symmetrical ESD protection for each signal line, for example, using a bidirectional TVS diode array. The shielding layer of the shielded cable should be grounded at a single point on the controller end. On the PCB, differential pairs should be strictly equal in length and spacing, referencing a complete ground plane. Through testing, inject common-mode interference into the cable and monitor the bit error rate or pulse loss at the differential receiver end to verify the improved immunity. A well-designed differential system can withstand severe common-mode noise environments.