For Remote Relay Control Without Long Cable Runs

LoRa wireless I/O modules matched to your site topology

Use Y401 for two fixed points, Y402 for one-to-many control, Y403 for linked multi-node outputs, or Y412 for 2/4/8-channel synchronous switching up to 10 km in open area.

Request Quote & Recommendation → Compare topologies first

Best for pump control, remote alarms, gate control, irrigation, lighting, ventilation, and field interlocks where trenching cable adds delay and cost.

✓ 5000 m / 10 km open-area options ✓ DC and AC power options by series ✓ No SIM card or subscription

Y401 for two-point control

Choose Y401 when two locations need mirrored dry-contact to relay control.

Y402 for one-to-many control

Choose Y402 when one master controls multiple slave nodes and receives return triggers.

Y403 / Y412 for larger layouts

Use Y403 when any node can trigger all outputs; use Y412 for longer-range 2/4/8-channel sync switching.

Need only two points? Start with Y401.
Need one controller and multiple remote nodes? Start with Y402.
Need multi-node linkage or the longest range? Compare Y403 and Y412.

Fast Project Review

Get the right topology and model

Share node count, distance, and control logic. We will recommend Y401, Y402, Y403, or Y412 quickly.

Reply within 24 hours from our engineering and sales team.

Pick the topology first

Most wrong inquiries come from choosing the wrong network structure, not the wrong relay rating.

Two fixed points Choose Y401 for a paired A/B link.

One center, many remotes Choose Y402 for master/slave expansion.

Any node triggers all Choose Y403 for multi-node linkage.

Long range, more channels Choose Y412 for 2/4/8-channel sync switching.

Y401-11-L

Point-to-Point

Best when two locations need to mirror dry-contact inputs to remote relay outputs.

Topology: Device A <-> Device B
Options: 1, 2, or 4 channel pairs
Best for: Gates, pump start/stop, simple alarm bridging

Ask About Y401 View Y401 specs

Y402-11-L

One-to-Many

Best when one central controller needs to drive multiple remote slave nodes and also receive return triggers.

Topology: 1 master + N slaves
Options: 1 channel, 4 channels, or 1-to-4 mapping
Best for: Irrigation zones, lighting, central-to-remote control

Ask About Y402 View Y402 specs

Y403-11-L

Multi-Node Linkage

Best when any linked node may need to energize all outputs and the site benefits from relay forwarding across multiple nodes.

Topology: N linked nodes
Logic: Any node input can energize all linked outputs
Best for: Complex sites, tunnels, distributed linkage, hard-to-wire layouts

Ask About Y403 View Y403 specs

Y412-44-L LoRa wireless sync switch module

Synchronous switching master and slave topology diagram

Y412-22/44/88-L

Sync Switching

Best when you need longer open-area range, 2/4/8 channels, and DIP-switch mode selection.

Topology: 1 master + N slaves
Range: 10 km open area
Best for: Remote start/stop, two-way control, latching or momentary switching

Ask About Y412 View Y412 specs

Y403-11-L automatic relay linkage diagram — Y403 automatic relay example: a trigger can forward from node to node and energize linked outputs across the chain.

Need multi-point linkage across a complex site?

Y403 is the right fit when one trigger must drive multiple linked outputs and the signal may need to forward through other nodes to reach the whole site.

Any linked node DI can energize all linked node DO outputs.
Outputs reset only after every linked input returns open.
Automatic relay forwarding helps extend overall communication reach.
For 2/4/8-channel synchronous switching or 10 km open-area range, compare Y412 instead.

Discuss a Y403 Deployment →

Good fit, and when to look elsewhere

This family is strongest when the control problem is simple, distributed, and digital.

Good fit if...

Trenching or long cable routing is the main blocker.
You need dry-contact input to relay output control.
You want a private wireless link with no SIM fees.
You can describe the required input-to-output logic before ordering.

Look at another architecture if...

You need analog sensing, logging, or PLC-style logic.
You need hard real-time safety performance without timing validation.
You need a protocol gateway rather than simple I/O linkage.
You need guaranteed coverage without a site layout review.

Questions Buyers Ask Before Choosing a LoRa Wireless I/O Module

These are the questions that usually decide whether the project fits Y401, Y402, Y403, or Y412.

Which topology should I choose: Y401, Y402, Y403, or Y412?

Use Y401 for two-point control, Y402 when one master controls multiple slaves, Y403 when any linked node may need to trigger all linked outputs, and Y412 when 2/4/8-channel synchronous switching or 10 km open-area range matters.

Are these modules a good fit if I need analog data or full PLC logic?

No. This family is strongest for digital input to relay output control. If you need analog acquisition, protocol conversion, or PLC logic, we can help you compare gateway or controller-based options.

Can I connect voltage directly to the DI terminal?

For Y401, Y402, and Y403, DI is for passive dry contact or NPN open-collector input. Do not connect a powered signal directly to DI; use an intermediate relay if needed.

What information should I send to get a useful recommendation?

Send node count, distance between nodes, obstacles on site, power availability, and what each relay output needs to control. That is usually enough for us to recommend Y401, Y402, Y403, or Y412 and flag any antenna or placement concerns.

Need a quote or a topology review?

Send your layout and control logic. We will recommend the right module family, node structure, and a practical starting kit for your site.

Tell us the control logic: What input should trigger which relay output, and whether one point or many points should respond.
Tell us the layout: Node count, distance, and obstacles are usually enough for a first recommendation.
Tell us the project stage: We can suggest a pilot kit, rollout quantity, or supporting documentation for internal review.

Need docs first? Y401 Specs | Y402 Specs | Y403 Specs | Y412 Specs

Quote + Engineering Review

Get the right wireless I/O recommendation

Share node count, distance, control logic, and application. We will send a fast recommendation.

We typically respond within 24 hours. No spam, ever.