File Version: V1.0.0

Safety Instructions

The following content describes the correct usage of the product, methods to prevent danger, and to avoid property damage. Please read this manual carefully before using the device and strictly follow it during operation. This manual serves only as a usage guide. All statements, information, or suggestions do not constitute a warranty.

The manual may be updated with product improvements. Please refer to the latest version for accurate information.

Usage Requirements

• Do not place or install the device in direct sunlight or near heat-generating equipment.
• Do not install the device in flammable, explosive, humid, dusty, or smoky environments.
• Do not install the device in locations with complex signal interference.
• During installation, keep the device away from large metal objects. Do not install the antenna inside a metal enclosure.
• Install the device in a stable location to prevent it from falling.
• Do not drip or splash liquids onto the device, and prevent liquids from entering the device.
• Always use a certified power adapter or DC power supply. Failure to do so may result in personal injury or device damage, for which the user assumes full responsibility.
• Do not disassemble the device arbitrarily.
• Perform all settings according to the instructions in this manual.

1 Overview

The one-to-many switching value wireless transmission system consists of two types of transmission modules: the master unit Y402-11-L-m and the slave unit Y402-11-L-s. These modules are device terminals that use LoRa modulation technology for remote transmission of switching values, enabling communication between the master and slave units.

Y402-11-L-s units can be distributed in multiple different locations. When the Y402-11-L-m collects a switching value signal, it will transmit it wirelessly to the relay outputs of multiple Y402-11-L-s units in the same system, achieving remote transmission of switching values from the master to the slaves. If one or more inputs among multiple slave Y402-11-L-s units are short-circuited, the output state of the master Y402-11-L-m will change, achieving remote transmission of switching values from the slaves to the master.

No SIM card required, no operating fees. Features include the ability to penetrate obstacles, bypass obstructions, strong anti-interference capability, and long-distance wireless signal transmission.

Modules are paired before leaving the factory. If users need to increase the number of slaves, they can purchase them and configure them independently.

Applicable scenarios: Industrial equipment control, smart agriculture, smart transportation, smart communities, hydrological monitoring and warning, aquaculture, rolling shutter door remote control, etc.

2 Features and Characteristics

2.1 Y402-11-L-m Features

• Wide voltage input, powered by (9\mathrm{V}\sim36\mathrm{V}) DC power supply;
• Power input terminal has reverse polarity protection;
• Supports 1 relay output;
• Supports 1 input;
• Supports a transmission distance of up to 5000 meters;
• Supports hardware watchdog timer, ensuring high reliability;
• Multiple LEDs indicate working status;
• Standard 35mm DIN rail mounting;

2.2 Y402-11-L-s Features

• Wide voltage input, powered by (9\mathrm{V}\sim36\mathrm{V}) DC power supply;
• Power input terminal has reverse polarity protection;
• Supports 1 relay output;
• Supports 1 input;
• Supports a transmission distance of up to 5000 meters;
• Supports hardware watchdog timer, ensuring high reliability;
• Multiple LEDs indicate working status;
• Standard 35mm DIN rail mounting;

3 Hardware Description

3.1 Y402-11-L-m Interface Description

Antenna: SMA interface for LoRa suction cup antenna or rod antenna.

Power: DC 9~36V input. Low voltage may cause the product not to start.

Input: Passive switch input, includes input terminal and common terminal.

Output: Relay output, includes Normally Open (NO) terminal, Common (COM) terminal, and Normally Closed (NC) terminal.

3.2 Y402-11-L-s Interface Description

Antenna: SMA interface for LoRa suction cup antenna or rod antenna.

Power: DC 9~36V input. Low voltage may cause the product not to start.

Input: Passive switch input, includes input terminal and common terminal.

Output: Relay output, includes Normally Open (NO) terminal, Common (COM) terminal, and Normally Closed (NC) terminal.

3.3 LED Indicator Description

Indicator Name	Function	Status Description
PWR	System Operation	Operation indicator is constantly on after system runs
LINK	Connection Status	Indicator is constantly on when connection is established
IN	Input	Indicator lights up when input terminal and common terminal are shorted, turns off after disconnection
OUT	Output	Indicator lights up when output common terminal and normally open terminal are conducting; turns off when output common terminal and normally closed terminal are conducting

3.4 Dimensions

The dimensions of Y402-11-L-m and Y402-11-L-s are the same.

4 Pairing Method

The master and slaves are paired before leaving the factory, so no pairing is needed. If you need to increase the number of slaves, you need to purchase slave units Y402-11-L-s. The purchased slaves need to be paired with the master to communicate with the master Y402-11-L-m. The pairing process is as follows:

1. Electrical wiring, connect 2 power lines and 3 communication lines;

2. Power on, supply power (9\mathrm{V}\sim36\mathrm{V}). After normal power supply, the PWR indicators of the master and slaves will be constantly on;

3. Automatic configuration: After about 20 seconds, the LINK indicators of both the master and slaves will be constantly on, indicating pairing is complete. If the LINK indicators of the master and slaves do not light constantly after 30 seconds, it is recommended to power off, check if the wiring is connected properly, and then power on again.

5 Wiring Procedures

The input and output wiring methods for Y402-11-L-m and Y402-11-L-s are the same. Use either device as a reference.

5.1 Input Connection Method

1. General mechanical switches (such as latching switches, float switches, intermediate relay outputs) without any voltage can be directly connected to the input terminals of the device.

2. Input connecting NPN signal

NPN signals can also be connected to the input terminals of the device. Connect the emitter of the NPN signal to the common terminal and the collector to the input terminal. These two NPN signal wires must not be connected to any other power source. Refer to the diagram below for connection:

5.2 Output Connection Method

[Image: Output connecting to load diagram]

1. Output connecting to a load

For controlling equipment with power within 1kW (purely resistive load), it can be directly connected in series with the device.

2. Output connecting to an AC contactor

If controlling high-power equipment (above 1KW, purely resistive load), a contactor is required. Refer to the following wiring diagram for a 220V AC contactor:

6 Precautions

1. The wireless switching value controllers Y402-11-L-m and Y402-11-L-s are half-duplex communication devices. In complex environments, the signal transmission time is uncertain, making them unsuitable for applications requiring high real-time performance.

2. Antenna operating frequency band: (398\sim525MHz). Operating outside this range will affect transmission and reception performance.

3. During use, check if the antenna interface is tightened. Place the antenna in an open area as much as possible, position it vertically, about 2 meters above the ground, and keep it away from large metal objects.