Where the contacts of a police-connect panel are needed for polarity reversal, the contacts may be used to provide a switched-voltage trigger for the dialer, as shown in figure 8-38. This hookup lets the panel's BELL TEST feature be used without causing any dialer transmission.

When using the bell output of an alarm panel as a switched-voltage trigger for the dialer, always run the trigger wires directly from the dialer input terminals to control the panel terminals. Do not run the wires from the dialer inputs to the bell, horn, or siren locations; and do not route the sounding-device wires through the cabinet. Figure 8-39 shows the correct wiring for this hookup. In this hookup, dialer terminals 2, 5, and 6 are connected together within the dialer. This permits a simplified three-wire trigger connection from the control panel.

Figure 8-38. - A switched-voltage trigger connected to a telephone dialer.

Figure 8-39. - Wiring diagram for a switched-voltage trigger.