RobotStudio event

How to use tool I/O (XS12)

Hey guys,
have a question about our abb yumi irb14000. I want to send a digital output signal to the tool flange off the right hand. I thought this would be possible via a cross connection bettween the xs12 connector (tool i/o) and the xs7 connector(digital outputs). I tryed it out and tested it with a voltage meter, but there wasn't a signal for all the time. Is there an software option which disables the ethernet on the toolflanges and enables the digital i/o on the tool flange?
I hope you can help me.
Sorry for my bad englisch.
Thanks in advance.