In the manual, page 10, under "Entry Phone Triggered Ring Cadence Activation", it states:
"When entry phone 2 is activated, a repeating double burst contact pattern is generated with 3 seconds off between patterns."
It sounds like the "double burst" activates the relay momentarily twice in rapid succession, then a three second pause before doing again. What is the on-off-on-off period of time? Something like; on for a half-second, off for a half-second, on for a half-second, off (then pause three seconds)?