Hi, A customer tested to connect the 2F-Gripper with PC through the Universal Controller on the basis of Modbus RTU. But they found an error message on RUI as below picture.The Blue and Green LED(Power and Communication) on Universal Controller are well functioning as On, respectively, at the same time the fault LED is off and the USB LED is under blinking. And The red color LED is observed on Gripper along with above condition.They took the RUI from your website then installed it according to the correct procedure. Even if they connected 'COM4' clicking 'Search for devices' and 'Auto Connect' in sequence, they failed to connect it, unfortunately. Could you answer me this question how can we resolve this?