---
title: "Front panel and addressing"
canonical: "https://docs.cuesystem.com/space/RUM/489095201/Front%20panel%20and%20addressing"
format: markdown
---
On the front panel of relayCUE-8, there are the following indicators and buttons (from left to right):

![image](media://b5713c4d-8f91-4e7a-996b-a78872642940)

- **PWR** LED lighted on whenever the unit is powered.
- **LINK** LED indicates activity on serial port. After power on this unit this LED flashes OK in “Morse alphabet” - if unit power on test has not recognized any problems and the unit is ready to work. If power on diagnostic recognizes some kind of internal failure, this LED starts flashing regularly.
- **Relay-status LED's 1-8 - **these LEDs are indicating current relay status where relay closed is indicated by LED light on.
- **Test buttons 1-8** - under normal operation, these buttons are logically in parallel to inputs 1-8. Pressing this button has the same effect as pressing a button connected to the appropriate input.
- **ACT** button - when this button is pressed, the relay LED indicators display the Address and Bank parameters in binary code (for value coding see table below).

**Address and Bank**

- Address: on relay LED 1-4 (where LED 1 is LSB and LED 4 is MSB)
- Bank: on relay LED 5-8  (where LED 5 is LSB and LED 8 is MSB)

Using this **ACT** button, you can check the actual setting of both basic system parameters Address and Bank.

When holding the **ACT** button, you can also change manually the actual setting of Address and Bank. By pressing buttons 1-8 (while instant press on **ACT**) you can toggle the actual value. The new value must be confirmed by releasing the **ACT** button and immediate short press of this button. The new confirmed value displayed on LEDs flashes several times for a confirmation that the unit accepted the new value.

![image](media://a4331613-b3a9-4c45-a757-f039c5c0ea41)

> 📝 Note several important points:
> 📝 
> 📝 - The process of displaying/changing Address and Bank using ACT button has no influence on current relay status.
> 📝 - While the ACT button is pressed, inputs 1- 8 remain inactive.
> 📝 - If you set manually the Address and the Bank on the unit which is working in the system where currently running project has a relayCUE-8 with its specific UnitID used in it, then after next Init (i.e. controller reset) the manually set parameters will be lost! The system in each its Init is renewing all parameters according to the settings in the currently running project! If the currently running project does not include the unit with the same UnitID, then the manually set parameters remain valid without any change!