Y402-41-L LoRa One-to-Four Wireless I/O Module System Datasheet

Y402-41-L Master	Y402-41-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 Y402-41-L is a one-to-many Wireless I/O Module system based on LoRa modulation with a four-to-one channel mapping design. It combines a 4DI/4DO master unit with one or more 1DI/1DO slave units. Each slave uses one independent master channel, so one master can serve up to four one-channel remote points.

Operating Logic

• Master to slave: when master DI1 to DI4 is closed, the DO on the slave assigned to that channel energizes
• Slave to master: when a slave DI is closed, the corresponding DO1 to DO4 on the master energizes
• The corresponding master and slave outputs reset when the associated input returns to open
• Four independent channels provide bidirectional transmission between the master and assigned one-channel slaves

Channel Mapping

Master channel	Assigned slave	Master-to-slave	Slave-to-master
Channel 1	One 1DI/1DO slave	Master DI1 -> slave DO	Slave DI -> master DO1
Channel 2	One 1DI/1DO slave	Master DI2 -> slave DO	Slave DI -> master DO2
Channel 3	One 1DI/1DO slave	Master DI3 -> slave DO	Slave DI -> master DO3
Channel 4	One 1DI/1DO slave	Master DI4 -> slave DO	Slave DI -> master DO4

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2. Ordering Information

System Components

Device	Model	Role	Channels	Dimensions
Master	Y402-41-L	Central control unit	4DI/4DO	88 x 72 x 59 mm
Slave	Y402-41-L	Remote terminal unit	1DI/1DO	88 x 37 x 59 mm

System configuration:

• Basic system: 1 master + 1 slave (factory paired)
• Expanded system: 1 master + up to 4 slaves, with each slave assigned to one master channel

Model Configuration

Y402-41-L is a one-to-many LoRa system. The first digit, 4, specifies 4 DI and 4 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	Y402-41-L master module
1	Y402-41-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. Four-channel master - Provides 4DI and 4DO for four independent remote channels
2. One-channel slave - Each slave provides 1DI and 1DO for one remote point
3. Four-to-one channel mapping - One master channel maps to one assigned one-channel slave
4. One-to-many architecture - One master supports up to four channel-assigned slave units
5. Long-range communication - Up to 5 km standard in open areas; a 10 km option is available for selected configurations
6. Bidirectional transmission - Supports master-to-slave and slave-to-master signaling
7. Wide supply range - 9 to 36V DC with reverse-polarity protection
8. Relay output - Master: 4 x SPDT relays; slave: 1 x SPDT relay, rated at AC 277V 5A / DC 28V 5A
9. Dry contact / NPN DI - Supports passive dry contacts and NPN open-collector inputs
10. Status indication - LEDs for power, link, input, and output status

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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	1.5W (master) / 0.8W (slave)
Master inputs	4 x passive dry contact / NPN open-collector (no voltage input to DI)
Master outputs	4 x SPDT relay
Slave input	1 x passive dry contact / NPN open-collector (no voltage input to DI)
Slave output	1 x 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

Master Interfaces

Interface	Description
Antenna	SMA connector for LoRa antenna
Power	DC 9 to 36V input with reverse-polarity protection
Input	4 x passive switch inputs (DI1 to DI4 + COM)
Output	4 x relay outputs (NO + COM + NC)

Slave Interfaces

Interface	Description
Antenna	SMA connector for LoRa antenna
Power	DC 9 to 36V input with reverse-polarity protection
Input	1 x passive switch input (DI + COM)
Output	1 x relay output (NO + COM + NC)

LED Indicators

Device	LED	Function	Status
Master	Power	System status	On after power-up
Master	Link 1 to 4	Channel link status	On when the corresponding channel link is established
Master	Input 1 to 4	Input status	On when the corresponding DI is closed
Master	Output 1 to 4	Output status	On when the corresponding relay is energized
Slave	Power	System status	On after power-up
Slave	Link	Channel link status	On when the wireless link is established
Slave	Input	Input status	On when DI is closed
Slave	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 one-channel slave, use the three-wire pairing method: connect positions 3 to 4, 4 to 3, and 5 to 5 between the master and slave assigned to the channel, 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. Use up to four one-channel slave units, with one slave assigned to each master channel.
5. Four-to-one mapping - Each master DI/DO channel maps bidirectionally to one assigned slave DI/DO channel.

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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