Sonoff 4CH Pro (R2) User Guide
Welcome to use Sonoff 4CH Pro! The Sonoff 4CH Pro is a 4-channel DIN rail mounting 433MHz RF remote WiFi switch that can independently control four home appliances. It supports switching among three working modes: inching, interlock, and self-locking mode.
Power supply: 90-250V AC (50/60Hz) / 5-24V DC. Max current: 10A/gang.
1. Download "eWeLink" app
Search "eWeLink" in the App Store for the iOS version or Google Play for the Android version.
[Image Description: A graphic showing two smartphone screens, one labeled "iOS" with "App Store" and the "eWeLink" app logo, and the other labeled "Android" with "Google play" and the "eWeLink" app logo.]
2. Wiring Instruction
If you want to connect the Sonoff 4CH Pro with lights or appliances, please strictly follow the wiring diagram.
You may choose to power up by 5-24V DC or by 90-250V AC. Each relay operates without voltage output.
The R1-R4 switches function as local control switches; you can directly press them to turn on/off the corresponding gang. They also serve as pairing buttons.
[Image Description: A top-down view of the Sonoff 4CH Pro circuit board, highlighting components. Key labels include: "Work mode switch K5", "433 clearing button", "433MHz receiver", "R1 switch" through "R4 switch", "Work mode switch S6", "Delay time switch K6", "WiFi module". Input terminals are shown for "Input DC 5-24V" and "Input AC 90-250V". Relay terminals are labeled "Relay1" through "Relay4" with COM, NC, NO connections. Status LEDs are indicated as "R1 led" through "R4 led" and "WiFi led".]
If you connect the Sonoff 4CH Pro with a motor, the wiring instruction is as follows:
AC Motor Wiring Diagram
[Image Description: A wiring diagram illustrating the connection of the Sonoff 4CH Pro to two AC motors. The diagram shows the device receiving "Input AC 90-250V" (L and N). Wires from the device's relays (COM and NO terminals) connect to two "Motor 90-250V AC" units. A note indicates "Toggle S6 to 0". A crucial note states: "Note: only 1 motor can run each time."]
DC Motor Wiring Diagram
[Image Description: A wiring diagram illustrating the connection of the Sonoff 4CH Pro to two DC motors. The diagram shows the device receiving "Input 5-24V DC" (positive and negative). Wires from the device's relays (COM and NO terminals) connect to two "Motor 5-30V DC" units. A note indicates "Toggle S6 to 0". A crucial note states: "Note: only 1 motor can run each time."]
3. Add Device
1. Power up your device using 90-250V AC (50/60Hz) or 5-24V DC.
2. Press and hold one of the 4 switch buttons for 7 seconds until the WiFi LED blinks rapidly 3 times and repeats.
3. Click the [+] icon on the eWeLink app to search for the device. Select the corresponding pairing icon, then click next. The app will auto-search the device.
4. Enter your home SSID & password. If your WiFi does not have a password, leave it blank.
4.2 eWeLink currently only supports 2.4G WiFi communication protocol; 5G WiFi routers are not supported.
5. The device will be registered by eWeLink and added to your account, which takes 1-3 minutes.
6. Name the device to complete the setup.
7. If the device appears "Offline" in eWeLink, it may need 1 minute to connect to your router and server. The device is "Online" when the WiFi LED is on.
3. Working Mode Settings
You can set the switch among three working modes: inching, interlock, and self-locking mode.
1. Self-locking mode: You can turn on/off the 4 connected devices independently. For example, if you turn on CH1, the connected device stays on. If you turn off CH2, the connected device keeps off.
2. Inching mode: You can turn on the connected devices for a specified duration (1-16 seconds). For example, you can turn on CH1 connected device for 1 second, and it will auto-off.
3. Interlock mode: You can turn on only one device at a time, and turning on a new device automatically turns off the previously active one. For example, if CH2 is on, and you turn on CH3, CH2 will be automatically turned off simultaneously.
[Image Description: A graphic illustrating the "Self-locking Mode + Inching Mode" concept. It shows a smartphone screen with control buttons for "lamp", "kitchen", "living room", and "LED", indicating ON/OFF states. It also shows a circuit board with labels pointing to switches: "Toggle K5 to 1100", "Toggle S6 to 1", and "Set delay time, toggle K6 to 1S (1100)".]
[Image Description: A graphic illustrating the "Inching Mode GIF" concept. It shows a smartphone screen with control buttons for "lamp", "kitchen", "living room", and "LED", indicating ON/OFF states. It also shows a circuit board with labels pointing to switches: "Toggle K5 to 0000", "Toggle S6 to 1", and "Toggle K6 to 1s (1100)".]
[Image Description: A graphic illustrating the "Interlock Mode GIF" concept. It shows a smartphone screen with control buttons for "lamp", "kitchen", "living room", and "LED", indicating ON/OFF states. It also shows a circuit board with labels pointing to switches: "Toggle S6 to 0".]
We will introduce how to switch among the 3 modes below:
[Image Description: A circuit board with labels pointing to switches: "S5", "S6", "K6", and "K5".]
CAUTION: Please cut off the power supply before switching S5, S6, K5, K6. Whether you use DC or AC input, make sure you have unplugged the power plug every time! It's very dangerous if you don't cut off the power supply, and the new settings cannot be activated.
| Position | Status | Mode | Apply to |
|---|---|---|---|
| 0 | Interlock | CH1 to CH4 | |
| 1 | Self-locking/Inching | CH1 to CH4 |
| Position | Status | Mode | Apply to |
|---|---|---|---|
| 1 | 0 | Inching | CH1 |
| 2 | 0 | Inching | CH2 |
| 3 | 0 | Inching | CH3 |
| 4 | 0 | Inching | CH4 |
| 1 | 1 | Self-locking | CH1 |
| 2 | 1 | Self-locking | CH2 |
| 3 | 1 | Self-locking | CH3 |
| 4 | 1 | Self-locking | CH4 |
Note: Cut off the main supply before changing work mode.
S6 is interlock / inching & self-locking switch: Toggle to the right (0), it enters into interlock mode; Toggle to the left (1), it enters into inching & self-locking mode.
K5 is inching/self-locking switches: From left to right, there are 1, 2, 3, 4, correspondingly for channel 1 (CH1), channel 2 (CH2), channel 3 (CH3), channel 4 (CH4). Toggle the switch down (0), the corresponding channel enters into inching mode; Toggle the switch up (1), the corresponding channel enters into self-locking mode.
Please note that if S6 is toggled to the right (0), your 4CH Pro is in interlock mode; it's invalid to set K5.
K6 is used to set the delay time for inching mode. From left to right, there are 1, 2, 3, 4, correspondingly for CH1, CH2, CH3, CH4. Take Sonoff 4CH Pro for example, toggle all switches down (0000), the inching time will delay for 16s; toggle all switches up (1111), the inching time will delay for 1s.
| Value | Delay | Apply to |
|---|---|---|
| 0000 | 16s | CH1 to CH4 |
| 0001 | 15s | CH1 to CH4 |
| 0010 | 14s | CH1 to CH4 |
| 0011 | 13s | CH1 to CH4 |
| 0100 | 12s | CH1 to CH4 |
| 0101 | 11s | CH1 to CH4 |
| 0110 | 10s | CH1 to CH4 |
| 0111 | 9s | CH1 to CH4 |
| 1000 | 8s | CH1 to CH4 |
| 1001 | 7s | CH1 to CH4 |
| 1010 | 6s | CH1 to CH4 |
| 1011 | 5s | CH1 to CH4 |
| 1100 | 4s | CH1 to CH4 |
| 1101 | 3s | CH1 to CH4 |
| 1110 | 2s | CH1 to CH4 |
| 1111 | 1s | CH1 to CH4 |
4. RF Remote Settings
Learn with 433MHz RF Remote: Each gang supports 1 RF key, meaning each gang can only remember the RF key learned last time. Quickly press twice one of the switches below, then press one of the ABCD buttons on your RF Remote. If learned successfully, the button will light up in red, and the corresponding status LED will blink in green for 4 times. You can press the button to turn on or turn off the corresponding channel.
Clear 433MHz Coding: S5 is the 433MHz code clearing button. Please press and hold it until the 4 LEDs light up green and off.
5. APP Features
1. Use WiFi to remote control 4 devices separately. Turn on/off by tapping on the device icon. Device status will simultaneously display on the interface.
2. Share Control
[Image Description: A circular icon composed of three interconnected dots, representing sharing.]
The owner can share devices to other eWeLink accounts. While sharing devices, both accounts should stay online on eWeLink. If the account you want to share with is not online, they will not receive the invitation message.
How to make it possible? Firstly, click Share, input the eWeLink account (phone number or email address) you want to share, tick the desired permissions (edit/delete/change/enable), then click Next. The other account will receive an invitation message. Click Accept; the device has been shared successfully, and the other account will have access to control your device.
3. Timing
[Image Description: An icon of a classic alarm clock.]
Supports a maximum of 8 enabled single/repeat/countdown timers to auto-turn on/off connected appliances.
4. Scene
Scene allows triggering on/off your devices automatically. Scene Settings are located in the upper right corner of the Device List. You can set up scenes or smart scenes to trigger on/off the Sonoff 4CH Pro.
Users should select "Click to execute" in the condition, add different existing devices, name the scene, and save it.
4. Problems and Solutions
Read the detailed FAQ on the Itead Smart Home Forum. If the answers below cannot solve your problem, please submit feedback on eWeLink.
1. My device has added successfully but stays "Offline".
Answers: The newly added device needs 1-2 minutes to connect to your router and the Internet. If it stays offline for a long time, please determine the problem based on the WiFi LED status:
1.1. WiFi LED quickly blinks once and repeats: The device failed to connect to the router. Reasons may include an incorrect WiFi password, the device being too far from the router causing a weak WiFi signal, or using a 5G WiFi router (only 2.4G WiFi is supported). Ensure your router's MAC address filtering is disabled if applicable.
1.2. WiFi LED slowly blinks once and repeats: The device has connected to the router and server but failed to be added to the device list. Power on the device again; if it still doesn't work, try adding the device again.
1.3. WiFi LED quickly blinks twice and repeats: The device has connected to the router but failed to connect to the server. Please confirm your WiFi router is working normally.
2. Why can't the APP find the device in pairing status?
Answers: This is likely due to your phone's cache. Please close your phone's WLAN and reopen it after a minute. Simultaneously, power off the device if possible, then power it up and try again.
3. My WiFi is expired, can I connect the devices to LAN?
Answers: Currently, this product does not support LAN or direct connection to a hotspot. It must connect to a WiFi router with a normal network that can access the Internet.
