Y401 / Y402 / Y403 Wireless I/O Module User Manual

Applicable models: Y401-11-L, Y401-22-L, Y401-44-L, Y402-11-L, Y402-41-L, Y402-44-L, and Y403-11-L.

Product Introduction

The Wireless I/O Module family uses a private LoRa link to replace long-distance control wiring. Each device provides digital input and relay output terminals, so a switch, sensor contact, PLC relay output, alarm contact, or controller contact can be carried, mapped, or forwarded to a remote relay output without a SIM card, Internet connection, or LoRaWAN gateway.

Main features:

• LoRa wireless communication, 398 to 525 MHz
• Up to 5 km standard in open areas; a 10 km option is available for selected configurations
• 9 to 36V DC power input
• DI supports passive dry contact and NPN open-collector input
• DO uses SPDT relay output, rated AC 277V / 5A or DC 28V / 5A
• DIN rail installation

This manual covers shared digital wiring, control logic, pairing, antenna installation, and commissioning. Use the Y401 / Y402 / Y403 Selection Guide for model naming, topology comparison, and model selection. Use each specification for model-specific power, range, relay, and analog-signal limits.

Control Logic

Y401 Point-to-Point

Y401 uses two paired devices: Device A and Device B. When a DI on one device closes, the corresponding DO relay on the other device energizes. When the input opens, the remote relay resets.

Channel mapping:

Model	Device A Input	Device B Output	Device B Input	Device A Output
Y401-11-L	DI1	DO1	DI1	DO1
Y401-22-L	DI1 to DI2	DO1 to DO2	DI1 to DI2	DO1 to DO2
Y401-44-L	DI1 to DI4	DO1 to DO4	DI1 to DI4	DO1 to DO4

Y402 One-to-Many

Y402 uses one master and one or more slaves. When the master input closes, the corresponding output on all slaves energizes. When any slave input closes, the corresponding output on the master energizes.

Channel mapping:

Model	Master to Slave	Slave to Master
Y402-11-L	Master DI1 -> all Slave DO1	Any Slave DI1 -> Master DO1
Y402-44-L	Master DI1 to DI4 -> all Slave DO1 to DO4	Any Slave DI1 to DI4 -> Master DO1 to DO4
Y402-41-L	Master DI1 to DI4 -> the DO on the assigned one-channel slave	Each slave DI -> the corresponding Master DO1 to DO4

For Y402-11-L and Y402-44-L, the master output resets only after the corresponding input on all slave devices returns to open. For Y402-41-L, each master output follows the input state of its assigned one-channel slave.

Y403 Auto Relay

Y403 uses equal-status nodes in an Auto Relay network. When the DI on any node closes, the DO on all nodes energizes, including the local node. The outputs reset only after every node input returns to open. Nodes automatically relay signals to extend the practical communication path.

For application fit and scenario selection, use the Y401 / Y402 / Y403 Selection Guide. This manual continues with shared installation and commissioning procedures.

Default Parameters

Parameter	Default / Requirement
Wireless mode	LoRa
Frequency band	398 to 525 MHz
Standard antenna	470 MHz magnetic-mount antenna
Power supply	DC 9 to 36V
Input type	Passive dry contact / NPN open-collector; no voltage input to DI
Output type	SPDT relay
Relay rating	AC 277V / 5A or DC 28V / 5A
Installation	35 mm DIN rail

Note: Wireless delay varies with distance, antenna placement, obstruction, and local interference. These products are not intended for emergency-stop, personnel-safety, hard-real-time, or timing-synchronization loops.

Basic Setup

Step	Action	Description
1	Identify the architecture	Use Y401 for two points, Y402 for master/slave expansion, and Y403 for Auto Relay.
2	Install antennas	Mount antennas vertically and keep them away from large metal surfaces.
3	Connect power	Use a certified DC 9 to 36V power supply and observe polarity.
4	Check pairing	Factory-matched devices can communicate after power-up.
5	Wire DI inputs	Connect passive dry contacts or NPN open-collector outputs to DI and COM; never apply voltage to DI.
6	Wire DO outputs	Connect loads or contactor coils through relay terminals NO, COM, and NC.
7	Test channel logic	Close each input and confirm the expected remote or linked output action.

Hardware Interfaces

Interface Area	Terminal / Part	Description
Power	V+, V-	DC 9 to 36V power input
Antenna	SMA connector	Connect the supplied LoRa antenna
Digital input	DI, COM	Contact-closure input for dry contact or NPN open-collector output
Relay output	NO, COM, NC	SPDT relay output for load or contactor control
Indicator LEDs	Power, link, input, output	Shows power, wireless link, DI, and DO status

Relay terminal meaning:

• COM: common terminal
• NO: normally open terminal; closes to COM after relay action
• NC: normally closed terminal; opens from COM after relay action

Wiring notes:

• Disconnect power before wiring.
• Never apply voltage to DI terminals.
• Relay contacts do not output voltage; an external load power supply is required.
• Add a fuse or circuit breaker according to the load current.
• For motors, solenoids, contactors, and other inductive loads, add suitable surge suppression.

Pairing and Expansion

Factory-matched devices are already paired. For the Y401, Y402, and Y403 models covered by this manual, use the same three-wire method to pair or re-pair a unit when replacing a unit, adding a Y402 slave or Y403 node, or restoring a lost link.

1. Power off both units and isolate the loads.
2. Connect the temporary pairing wires between the two units: position 3 to 4, position 4 to 3, and position 5 to 5. The positions are shown in the pairing diagram; confirm the physical terminal markings on the device.
3. Connect DC 9 to 36V power to both units, observing polarity.
4. Power on and wait for both link indicators to remain on.
5. Power off, remove the temporary pairing wires, then power on and test the wireless control logic.

For Y401, the two units are Device A and Device B. For Y402, use the master and the new or replacement slave. For Y403, use the existing node and the new or replacement node. The three-wire procedure is the same for these three series; confirm the physical terminal markings before connecting.

Antenna Installation

Item	Recommendation
Frequency	Use antennas within 398 to 525 MHz
Orientation	Install vertically
Height	About 2 m above ground or higher when possible
Clearance	Keep away from cabinets, walls, pipes, and large metal structures
Connector	Tighten the SMA connector by hand

Good antenna placement improves range more effectively than increasing transmit power. In metal cabinets, lead the antenna outside the cabinet whenever possible.

DI Wiring

DI accepts dry contacts and NPN open-collector outputs. Connect the signal between DI and COM.

No voltage input on DI

Never connect a powered signal or voltage source directly to DI.

For PNP, PLC, or other powered outputs, use an intermediate relay and connect only its dry contact to DI and COM.

DO Wiring Diagrams

DO is an isolated relay contact output. It can switch small loads directly or drive an external contactor for larger loads.

Small Loads

For lamps, alarm devices, small heaters, and other resistive loads within the relay rating, connect the load power line through COM and NO.

Contactor-Controlled Loads

Large Loads

Use the module relay output to drive a properly rated contactor for motors, pumps, heaters, and other high-power loads. The contactor switches the load circuit.

Three-Phase Equipment

Use the module relay output to drive a properly rated contactor for three-phase motors, pumps, and other equipment. The contactor switches the three-phase circuit.

Safety Notes

• Use a certified power supply and confirm polarity before power-up.
• Do not install the device in explosive, high-humidity, corrosive, or heavily dusty environments.
• Do not exceed the relay contact rating.
• Do not use the wireless link as the only protection path for emergency stop, personnel safety, or other hard real-time safety functions.
• High-voltage AC wiring must be performed by qualified personnel.

---

• 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