External Events for 6890 not working

For 6890 External Events, Open Lab software. I have configured valve 8 (switching) to ON,  Timed events on valve 8 are 0 min OFF, 2.9 min ON, 2.99 min OFF.  I see the keypad showing the correct valve settings at the correct times.  However, voltage measurement on the cable wires (wires 7-ground and 8-input 1) shows no change from 4.19 volts (no infinity reading with valve change). My goal is to have method on external detector stop at 3 minutes.  Is there something that I should check? 

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