Y402-44-L LoRa One-to-Many Wireless I/O Module System Specification

Y402-44-L Master	Y402-44-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

1. Overview

Y402-44-L links one master with one or more slaves over LoRa. Each unit has 4 DI and 4 SPDT relay outputs. Matching channels exchange signals independently; the basic master/slave set is factory paired.

Operating Logic

• Master to slave: when master DI1 is closed, DO1 on all slave units energizes; the same logic applies to DI2 to DI4
• Slave to master: when DI1 on any slave is closed, DO1 on the master energizes; the same logic applies to DI2 to DI4
• During normal communication, the corresponding output on the master resets only after the same channel on all slave units returns to open

Communication Loss

If wireless communication is lost, the receiver retains the last relay output states for approximately 80 seconds. If communication has not recovered by then, the relay outputs automatically reset to the de-energized (OFF) state. The normally open (NO–COM) contacts open.

2. Ordering Information

System Components

Device	Model	Role	Channels
Master	Y402-44-L	Central control unit	4DI/4DO
Slave	Y402-44-L	Remote terminal unit	4DI/4DO

System configuration:

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

Model Configuration

Y402-44-L is a one-to-many LoRa system. The first digit, 4, specifies 4 DI and 4 DO on the master; the second digit, 4, specifies 4 DI and 4 DO on each slave.

For the full code and examples, see Model Naming.

Package Contents

Qty.	Item
1	Y402-44-L master module
1	Y402-44-L slave module
2	470 MHz magnetic-mount antennas
2	DIN rail clips
1	Quick reference guide
1	Warranty card

3. Key Features

• Passive dry-contact/NPN inputs and SPDT relay outputs
• Reverse-polarity protection
• Hardware watchdog
• Private LoRa communication without a SIM card or Internet gateway

4. Technical Specifications

Wireless

Parameter	Specification
Frequency band	398 to 525 MHz
Communication mode	Half-duplex
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	2W (master) / 1.5W (slave)
Input channels	4 x passive dry contact / NPN open-collector (no voltage input to DI)
Output channels	4 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

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	4 x passive switch input (DI + COM)
Output	4 x 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 1 to 4	Input status	On when the corresponding DI is closed
Output 1 to 4	Output status	On when the corresponding relay is energized

6. Mechanical and Environmental

Mechanical Specifications

Parameter	Master	Slave
Dimensions	88 x 72 x 59 mm	88 x 72 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

7. Installation and Wiring

Use the Y402-44-L user manual for power, input, and relay wiring, pairing or replacement, and commissioning.

DI accepts dry contacts or NPN open-collector signals, not voltage inputs. Relay contacts require an external load supply. Select the load and protection against the electrical ratings above.

8. Important Notes

• Range figures assume an open-area installation. The 10 km option requires the specified configuration and antenna; obstructions, interference, and antenna placement affect the installed link.
• The half-duplex wireless link is unsuitable for guaranteed timing or as the sole emergency-stop/personnel-safety path.
• Independent channels describe input-to-output mapping; they do not establish galvanic isolation between channels.
• Use one master per system.

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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