If there is no color difference between the outgoing lines, it can be judged by the following methods. ? 1.？ Measure two wires at will with a multimeter. If the resistance is between 50 and 75 ohms, one of the wires is the center line. Replace the wiring of probe A. If the resistance remains the same, probe B is the neutral line. ? 2.？ If the resistance of the two wires is between 100 and 150 ohms, there is no center line, and retest according to step 1. ? 3.？ Connect the center line to the positive voltage of +9V ~+12V, and connect the other lines to the negative voltage of -E respectively. Observe the rotation of the motor shaft, and find that the motor shaft direction of each line is the same, and the rotation angle is the same, and then determine the sequence of A B C D lines.

For specific technical questions, please contact Ji Sangong, Xi 'an, Suzhou.