> For the complete documentation index, see [llms.txt](https://wiki.inels.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://wiki.inels.com/inels-home/inels-wireless/tutorial-6-several-buttons-a-wired-button-and-a-central-off.md).
# Tutorial 6: several buttons, a wired button and a central OFF
Pair several buttons with several units, add an existing wired button, and make one button switch off everything.
*Part 2 — Tutorials. Do* [*Tutorial 1*](/inels-home/inels-wireless/tutorial-1-your-first-button-and-light.md) *first.*
***
## What you will build
Two lights in one room. Each has its own button. One more button switches **both** off. A wired wall button that was already in the wall also switches one of the lights.
```mermaid
flowchart LR
B1["Button 1"] -->|"4× toggle"| A["Unit A
hall light"]
B2["Button 2"] -->|"4× toggle"| B["Unit B
kitchen light"]
B4["Button 4
central OFF"] -->|"3× switch off"| A
B4 -->|"3× switch off"| B
W["Wired button"] -->|"4× toggle"| A
```
| | Behaviour | You will learn |
| - | -------------------------------- | --------------------------------- |
| 1 | Button 1 toggles light A | Several buttons, several units |
| 2 | Button 2 toggles light B | One controller, two receivers |
| 3 | Button 4 switches both off | One button paired with many units |
| 4 | The wired button toggles light A | An external button input |
## You need
* **Two RFSAI-61B-SL** switch units, wired as in [Tutorial 1](/inels-home/inels-wireless/tutorial-1-your-first-button-and-light.md) ([unit page](/inels-home/inels-wireless/devices/switch-units/rfsai-xxb-sl.md))
* **RFWB-40/MPW** wall controller (4 buttons), or any controller with a pairing button
* Two lights
* An existing **wired button** for light A (optional)
{% hint style="info" %}
How many buttons can one unit take? **RFSAI-61B-SL: 25.** RFSAI-62B-SL: 12 per output. One button can control as many units as you like. Each unit remembers its own pairings.
{% endhint %}
## 1. The pairing recipe
You will use the same recipe for every pairing. Only the **button**, the **unit** and the **number of presses** change.
{% stepper %}
{% step %}
#### Controller into pairing mode
Hold the controller's pairing button for **1 s**. The red LED gives a short blink.
{% endstep %}
{% step %}
#### Unit into programming mode
Hold **PROG** on the unit for **2 s** (RFSAI-61B-SL). The LED flashes once per second. Do not hold it for 5 s: that starts clearing.
{% endstep %}
{% step %}
#### Press the button N times
Press the controller button **N times, about 1 s apart.** The unit's LED lights at each press.
{% endstep %}
{% step %}
#### Finish
Short press **PROG** on the unit (under 1 s). Then short press the controller's pairing button.
{% endstep %}
{% endstepper %}
Other units have other PROG times: look yours up in [Appendix A](/inels-home/inels-wireless/appendix-a-prog-button-times.md). Presses and functions: [Appendix B](/inels-home/inels-wireless/appendix-b-functions-by-number-of-presses.md).
## 2. The plan
Write this down first. Then follow it one line at a time.
| Pairing | Controller button | Unit | Presses | Function |
| ------- | ----------------- | ---- | ------- | ---------------------- |
| 1 | Button 1 | A | 4× | Impulse relay (toggle) |
| 2 | Button 2 | B | 4× | Impulse relay (toggle) |
| 3 | Button 4 | A | 3× | Switch off |
| 4 | Button 4 | B | 3× | Switch off |
| 5 | Wired button | A | 4× | Impulse relay (toggle) |
## 3. Do the pairings
#### Pairings 1 and 2: one button per light
Use the recipe for pairing 1 (button 1, unit A, 4 presses). Then use it again for pairing 2 (button 2, unit B, 4 presses).
After each, test it: the light must toggle on every press.
#### Pairings 3 and 4: the central OFF
The central OFF is **one button paired to many units**. You do nothing special: you just repeat the recipe once per unit.
1. Recipe for **button 4, unit A, 3 presses.**
2. Recipe for **button 4, unit B, 3 presses.**
{% hint style="info" %}
Do the **whole recipe** for each unit, including the controller's pairing button. Do not try to go from one unit to the next without finishing.
{% endhint %}
#### Pairing 5: the wired button
The RFSAI-61B-SL has an **external button input**. A wired button or switch connected there is paired **exactly like a wireless one**.
{% hint style="danger" %}
**The external-button input is at mains potential.** Switch off the circuit. Wire the button as a mains device, and have it done by a qualified person.
{% endhint %}
{% stepper %}
{% step %}
#### Unit A into programming mode
Hold **PROG** on unit A for **2 s**. The LED flashes once per second.
{% endstep %}
{% step %}
#### Press the wired button 4 times
Press the wired wall button **4 times, about 1 s apart**.
{% endstep %}
{% step %}
#### Finish
Short press **PROG** on unit A.
{% endstep %}
{% endstepper %}
This works on the RFSAI-61B-SL, RFSAI-62B-SL and RFSAI-61BPF-SL. On the **RFSAI-11B-SL** the external button has a fixed ON/OFF function and is not paired.
## 4. Test
| Press | Result |
| ------------------------------------------ | --------------- |
| Button 1 | Light A toggles |
| Button 2 | Light B toggles |
| Wired button | Light A toggles |
| Switch both lights on, then press button 4 | **Both** go off |
| Press button 4 again | They stay off |
## If it did not work
| What you see | Cause | Fix |
| ------------------------------------------------------------------ | ---------------------------------- | ----------------------------------------------------------------------------------------------------------------------------- |
| Button 4 switches off only one light | You paired only one unit | Do the recipe again for the other unit |
| A button toggles the wrong light | Wrong unit was in programming mode | Clear that button on the wrong unit ([Tutorial 7](/inels-home/inels-wireless/tutorial-7-fixing-mistakes.md)), then pair again |
| Button 4 toggles instead of switching off | 4 presses instead of 3 | Clear it on that unit and pair again with 3 presses |
| Wired button does nothing | Not wired, or input not paired | Check the wiring first. Then repeat pairing 5 |
| Nothing happens when you press the wired button during programming | The unit is an RFSAI-11B-SL | Its external button is fixed. Wire it correctly; there is nothing to pair |
| A new button will not pair | The unit's memory is full | Clear buttons you do not use |
| LED flashes 4× per second | PROG held too long | Release and start again |
***
## What you learned
* One controller can have a different job on every button.
* One button can control **many units**: pair it to each unit.
* A wired button on an RFSAI is paired like a wireless one.
* The central OFF is simply a 3× pairing repeated on every unit.
## Try this before moving on
1. Add a third unit and pair button 4 to it as 3×. One press now switches off three lights.
2. Pair button 3 as **2×** (switch on) to both units: a central ON.
3. With a two-channel **RFSAI-62B-SL**, pair button 1 to output 1 and button 2 to output 2 ([RFSAI page](/inels-home/inels-wireless/devices/switch-units/rfsai-xxb-sl.md)).
**Next:** [Tutorial 7 — fixing mistakes](/inels-home/inels-wireless/tutorial-7-fixing-mistakes.md)