• UL Listed for NFPA 72 remote station applications
• Adjustable alarm and supervisory output current
• Alarm activation delay
• System test mode with LED indicator
• Easy installation
The D185 Reverse Polarity Signaling Module communicates system conditions (alarm, trouble, and supervisory) from a compatible control panel to a monitoring station by reversing or interrupting the polarity of a steady signal it sends over leased telephone company (telco) lines. The module operates over one or two pairs of lines and with either a 12 VDC or 24 VDC supply. All circuits are power limited.