Double twist cable 1, 2, 3, 4, 5, 6, 7, 8 and G can be tested. Cable assignment test: open, short and crossover of LAN cable, two-wire (RJ11) / four-wire (RJ45). Can judge wrong connection, short circuit and open circuit Detect DC line, determine anode and cathode, and detect open, short and cross signal. “OFF” means “Off”, “ON” means normal speed, “S” means slow speed
