Y402-11-L LoRa One-to-Many Wireless I/O Module System Datasheet

Y402-11-L Master	Y402-11-L Slave

• User Manual

Contents

1. Overview
2. Ordering Information
3. Key Features
4. Technical Specifications
5. Interfaces and Indicators
6. Mechanical and Environmental
7. Installation and Wiring
8. Important Notes

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1. Overview

The Y402-11-L is a one-to-many Wireless I/O Module system based on LoRa modulation. It consists of a master unit (M) and one or more slave units (S). One master can communicate with multiple slaves for scalable field deployment. A basic master/slave set is factory paired and ready to use.

Operating Logic

• Master to slave: when the master DI is closed, the DO on all slave units energizes
• Slave to master: when the DI on any slave is closed, the DO on the master energizes
• The master output resets only after the DI on all slave units returns to open
• Bidirectional signal transmission with expandable topology

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2. Ordering Information

System Components

Device	Model	Role	Dimensions
Master	Y402-11-L	Central control unit	88 x 72 x 59 mm
Slave	Y402-11-L	Remote terminal unit	88 x 37 x 59 mm

System configuration:

• Basic system: 1 master + 1 slave (factory paired)
• Expanded system: 1 master + N slaves

Model Configuration

Y402-11-L is a one-to-many LoRa system. The first digit, 1, specifies 1 DI and 1 DO on the master; the second digit, 1, specifies 1 DI and 1 DO on each slave.

For the full code and examples, see Model Naming.

Package Contents

Qty.	Item
1	Y402-11-L master module
1	Y402-11-L slave module
2	470 MHz magnetic-mount antennas
2	DIN rail clips
1	Quick reference guide
1	Warranty card

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3. Key Features

1. One-to-many architecture - One master controls multiple slave units
2. Long-range communication - Up to 5 km standard in open areas; a 10 km option is available for selected configurations
3. Bidirectional transmission - Supports master-to-slave and slave-to-master signaling
4. Scalable system - Additional slave units can be added as required
5. Wide supply range - 9 to 36V DC with reverse-polarity protection
6. Relay output - SPDT relay, rated at AC 277V 5A / DC 28V 5A
7. Dry contact / NPN DI - Supports passive dry contacts and NPN open-collector inputs
8. Status indication - LEDs for power, link, input, and output status
9. Industrial design - Hardware watchdog and 35 mm DIN rail mounting
10. No operating fee - No SIM card and no subscription required

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4. Technical Specifications

Wireless

Parameter	Specification
Frequency band	398 to 525 MHz
Communication range	Up to 5 km standard; 10 km option available for selected configurations
Antenna connector	SMA
Standard antenna	470 MHz magnetic-mount antenna

Electrical

Parameter	Specification
Supply voltage	9 to 36V DC
Max. power consumption	1W (master) / 0.8W (slave)
Input type	Passive dry contact / NPN open-collector (no voltage input to DI)
Output type	SPDT relay
Output rating	AC 277V 5A / DC 28V 5A
Operating temperature	-20 to +85 degC
Operating humidity	10% to 90% RH, non-condensing

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5. Interfaces and Indicators

Interface Summary (Master and Slave)

Interface	Description
Antenna	SMA connector for LoRa antenna
Power	DC 9 to 36V input with reverse-polarity protection
Input	Passive switch input (DI + COM)
Output	Relay output (NO + COM + NC)

LED Indicators

LED	Function	Status
Power	System status	On after power-up
Link	Link status	On when the wireless link is established
Input	Input status	On when DI is closed
Output	Output status	On when the relay is energized

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6. Mechanical and Environmental

Mechanical Specifications

Parameter	Master	Slave
Dimensions	88 x 72 x 59 mm	88 x 37 x 59 mm
Weight	Approx. 50 g	Approx. 50 g
Mounting	35 mm DIN rail	35 mm DIN rail
Protection rating	IP20	IP20
Housing material	Flame-retardant plastic	Flame-retardant plastic

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7. Installation and Wiring

Input Wiring

No voltage input on DI

The digital input (DI) is not a voltage-input terminal. It is strictly forbidden to connect any powered signal or voltage source to DI.

Correct wiring: connect only a passive dry contact or an NPN open-collector output between DI and COM. Do not connect sensor power, PLC voltage output, or any external voltage directly to DI.

Mechanical switches (maintained switch, float switch, relay contact):

• Connect directly between DI and COM
• No external power supply is required

NPN open-collector output:

• Output transistor collector -> DI
• Output transistor emitter / 0V reference -> COM
• Do not connect sensor power or any voltage output to DI

Output Wiring

Direct load (<= 1 kW resistive load):

• Wire the load in series with the relay output

High-power load (> 1 kW):

• Use an AC contactor or external power relay

Installation Notes

1. Install the antenna vertically in an open area, about 2 m above ground.
2. Keep the unit away from large metal structures.
3. Tighten the antenna connector securely.
4. Mount the unit inside the control cabinet on a 35 mm DIN rail.
5. Place the master near the center of the coverage area whenever possible.
6. Leave enough space for ventilation.

System Expansion

To add a new slave unit, use the three-wire pairing method: connect positions 3 to 4, 4 to 3, and 5 to 5 between the master and new slave, power both units, wait for the Link indicators to remain on, power off, remove the temporary wires, and power on again. Confirm the physical terminal markings before connecting.

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8. Important Notes

1. Communication mode - Half-duplex communication, not intended for hard real-time control.
2. Frequency range - Recommended operating range is 398 to 525 MHz. Performance may degrade outside this range.
3. Antenna placement - Install the antenna vertically in an open area and keep it away from metal obstructions.
4. Master/slave topology - Only one master unit is allowed in each system, while multiple slave units are supported.

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• Manufacturer: Hunan YenGear Tech Co., Ltd.
• Address: Room 21014, Building 1, Fudi Xingguang Tiandi, Yingxin Road, Yuhua District, Changsha, Hunan, China
• Email: [email protected]
• Website: www.yengear.com