Relay Base

[ggkinuthia]

Hi,
I have a site containing relay bases, which seems to cutoff the loop voltage to a certain level. Beyond this point the detectors are not working even after bypassing the first Relay base where the problem is occuring.
The detector detector in this relay base doesn't work or its green led doesn't flash to indicate any activity but works in another loop. If I connect both -ve on the in terminal of the relay base the detector flashes continuosly but still communication fault on the panel.