Interpreting LEDs
The green (status) LED on the Tracer ZN521 controller (see Figure 19 on page 51) indicates whether the controller has power applied to it and if the controller is in manual test mode (see Table 14).
Table 14. Green LED: Status indicator
LED activity | Explanation |
|
|
LED is on continuously. | Power is on (normal operation). |
|
|
LED blinks (one recurring blink). | Manual output test mode is being |
| performed and no diagnostics are |
| present. |
|
|
LED blinks (blinks twice as a recur- | Manual output test mode is being |
ring sequence). | performed and one or more diag- |
| nostics are present. |
|
|
LED blinks (1/4 second on, | The |
1/4 second off for 10 seconds). | and the controller is |
| communicating.1 |
LED is off continuously. | Either the power is off, |
| the controller has malfunctioned, or |
| the Test button is being pressed. |
|
|
1By sending a request from the Rover service tool, you can request the controller’s green LED to blink (“wink”), a notification that the controller received the signal and is communicating.
The yellow (communications) LED on the Tracer ZN521 controller (see Figure 19 on page 51) indicate the controller’s communication status (see Table 15).
Table 15. Yellow LED: Communications indicator
LED activity | Explanation |
|
|
LED is off continuously | The controller is not detecting any |
| communication (normal for stand- |
| alone applications). |
|
|
LED blinks. | The controller detects communica- |
| tion (normal for communicating |
| applications, including data sharing). |
|
|
LED is on continuously. | Problem with communication link |
| wiring (possible need for termination |
| resistor), or controller failure (caused |
| by power surge, lightning strike, etc.) |
|
|
| 57 |
