so I'm have an ess and a c25 with probe . It is powered by a 2 amp 5 volt supply , both ess and c25 are powered by it . I'm not sure why when I connect probe signal pin 13 port 2 to ground it doesn't show tripped in mach . The probe checks out with a meter . the ess and mach are configured for that pin name to probe . anything I missed ?