官网购买了MMP757188-36-C和eMotion System Communication Kit，使用eMotion SystemTM Virtual Bench软件时总显示Communication failed，MMP757188-36-C板正常供电24V，eMotion System Communication Kit的485A、485B、GND正常连接，资料上说If the USB communication is successful but there is no response from the motor (as would be the case if the motor was not powered), then “Communication failed “will be displayed，这应该怎么解决？
Bench软件上的显示是红色的not connected吗？