DOBOT MG400'I/O => 24V-18V? Need 24V-0V,Help


I checked DOBOT MG400’s I/O voltage using tester.
tester shows that I/O ON -> 24V, but I/O OFF -> 18V!
I need 0V, because another device cannot work 24V-18V,

Does anyone have the same Trouble?
Please contact me and let’s solve this problem or please tell me how to solve.



This is the robot IO generated virtual voltage, this situation, 18V does not have any driving ability