Solution
1A) The normal Bell output voltage on the DS7420I (with EOL intact) should be around negative(-) 5VDC.
1B) The off-normal Bell output voltage (with EOL removed) should be around negative (-) 12VDC (when EOL is not being detected by the DS7420I).
1C) The voltage on the Bell output when a fire alarm is going off should be around positive (+) 12VDC.
2A) The normal Auxillary output voltage on the DS7420I (with EOL intact and supervision jumper not cut) should be around negative (-) 5VDC.
2B) The off-normal Auxillary output voltage (with EOL removed) should be around negative (-) 12VDC.
2C) The voltage on the Auxiilary output when a Fire alarm is going off should be around positive (+) 12VDC.
2D) To unsupervise the Auxillary output cut the Auxillary output jumper located near the Aux. output terminals on the DS7420I.
2E) When the supervision jumper is cut the normal and off-normal Auxillary output voltage should be 0VDC (with or without EOL).
Part numbers DS7400X, DS7400, DS7400Xi, DS7400XIVER2, DS7400XIVER3+, DS7400XIVER4+, DS7420i
