![](/images/new-backgrounds/1074547/7454711x1.webp)
Controller Circuit Board
Features
Power
Generic
Auto Test Button
Status LED
Communications LED
Service Button and LED
Communications | Zone Sensor Connections |
|
Figure 2: Tracer ZN.520 unit controller circuit board
9 |
Power
Generic
Auto Test Button
Status LED
Communications LED
Service Button and LED
Communications | Zone Sensor Connections |
|
9 |