mach3 wont reset keeps saying external emg stop requested

[JAZZCNC]

hi Clive
yes i have dvm i assume L N are 240 volt but how do i check the v- v+ do i put the black probe on v- and red on v+ sorry im not up on electronics
thanks Geoff

Yes Geoff black on V- Red on V+ but you'll need to change the meter from reading AC to DC.