Sir We are using AX2850HE motion controller. When we tested previously it works fine. We have given 24 V DC to is and didn't connect any motor to it and connect the serial cable to PC . When we switch ON the Power Supply (24Volt) there is no LED disply and no massege got on Hyperterminal .What is the problem? Please we me the solution so that i can solve the problem. Previously this controller works fine.