What is the maximum voltage I can input to the extra dry contacts on the securityProbe8-X20?

AKCP AdministratorsecurityProbe Series, Support

You can input up to 30 Volts DC to the extra dry contacts, as long as you have them configured as opto isolated. See Question #1 in the ?How Do I? section of this knowledge base for instructions on how to set the dry contacts to opto isolated mode

AKCP AdministratorWhat is the maximum voltage I can input to the extra dry contacts on the securityProbe8-X20?