Y401
Two locations
Corresponding DI channels at either node drive the remote node relay outputs.
Typical fitA single control-cable replacement between two points.
View Y401 models Wireless I/O Modules · Y401 / Y402 / Y403
Wireless I/O Modules for Control-Cable Replacement
Send a dry-contact or NPN input to a remote SPDT relay output over a private LoRa link. Pick the topology and I/O count that match your control relationship—range is rarely the deciding factor.
For auxiliary control and signalling. Emergency-stop, life-safety and hard-real-time circuits must stay on their own independently certified system.
Dry contact
or NPN
or NPN
DI over
private LoRa
private LoRa
SPDT relay
to load circuit
to load circuit
3control topologies
7current models
Cable-free controlprivate local LoRa link; no SIM or gateway
Up to 10 km*open-area range option
* Range depends on model, antenna and site; check the radio path before you install.
Local control without a long signal cable
How Wireless I/O Signal Transfer Works
A field input changes at one node, the Y40 link carries that state over LoRa, and a relay contact changes at the linked node or nodes.
- 01
Read the field signal
Connect a passive dry contact or NPN open-collector output to DI. Never apply voltage directly to DI.
- 02
Transmit the state
Factory-paired or commissioned modules exchange the I/O state over a private 398–525 MHz LoRa link.
- 03
Switch the remote circuit
The linked SPDT relay changes state. Use an external supply and a suitable contactor when the load requires one.
- 04
Commission the relationship
At the real site, test every input, output, antenna position, power-loss response and fail state.
Step 1 · choose a topology
Choose the Control Relationship
Start with the relationship between locations: two points, one master with several slaves, or multiple equal nodes. This determines the Y401, Y402 or Y403 series before I/O count enters the decision.
Y402
One master, multiple slaves
Master inputs drive matching outputs at all slaves; slave inputs can drive the matching master output.
Typical fitOne controller operating several remote points with return signalling.
View Y402 models 
Y403
Multiple equal nodes
Any closed node input energizes all linked outputs, including the local output.
Typical fitMany trigger points that must activate every linked alarm or relay point.
View Y403 models Not sure which relationship fits your site?Send the number of locations, I/O points, distance and intended load.
Request a Site Review Common starting points
Typical Wireless I/O Applications
These examples show the signal relationship, not a finished-system design. Safety, load and compliance details always depend on your application.
Start with Y401 or Y402
Access-Control Signal Extension
Pass a dry-contact status or control signal between access-control equipment and a remote relay point when running a new cable is impractical.
Keep door hardware, fail-safe/fail-secure logic, fire release and code compliance inside the approved access-control design.
Start with Y403
Multi-Point Linkage Alarm
Connect distributed dry-contact triggers so an event at any node energizes every linked relay output for local alarm or auxiliary notification.
Use a dedicated safety or life-safety system where regulations or a risk assessment require one.
Start with Y401 or Y402
Remote Wireless Equipment Control
Send an approved control contact to a remote relay or suitably rated contactor for pumps, fans, gates or other field equipment.
Specify load switching, interlocks and feedback separately; the relay contact itself does not supply load voltage.
Step 2 · select the I/O count
Select a Wireless I/O Model
After choosing the topology, select the input and output count required at each location. Current models share 9–36 VDC power, 35 mm DIN-rail mounting, SPDT dry-contact relay outputs and an open-area range option up to 10 km*.
Y401
Point-to-Point Wireless I/O
A factory-paired two-node link mirrors corresponding input channels to relay outputs in both directions.
Y401-11-L
LoRa Point-to-Point 1DI + 1DO
I/O configuration1DI + 1DO per node
Y401-22-L
LoRa Point-to-Point 2DI + 2DO
I/O configuration2DI + 2DO per node
Y401-44-L
LoRa Point-to-Point 4DI + 4DO
I/O configuration4DI + 4DO per node
Y402
One-to-Many Wireless I/O
One master distributes matching input states to one or more slave nodes, while slave inputs can return a signal to the master.
Y402-11-L
LoRa One-to-Many 1DI + 1DO
I/O configuration1DI + 1DO per node
Y402-44-L
LoRa One-to-Many 4DI + 4DO
I/O configuration4DI + 4DO per node
Y402-4411-L
LoRa One-to-Four 4DI + 4DO
I/O configuration1-channel master / 4-channel slave
Y403
Multi-Node Linkage
When any linked node input closes, every node relay output energizes; outputs reset after all linked inputs open.
Private LoRa architecture
One trigger, every linked output.
Y403-11-L modules form a private LoRa network that distributes input states across linked nodes. When any linked input closes, every SPDT relay output energizes together; outputs reset after all linked inputs open.
- 01Any linked input closesA dry contact or NPN open-collector input changes at any linked node.
- 02Private LoRa carries the stateThe local link carries the state without a SIM card, Internet connection or LoRaWAN gateway.
- 03All linked SPDT relays energizeEvery linked relay output changes together and returns after all linked inputs open.
Private LoRa architecture
Multiple trigger points
Input 1Input 2Input N
Y403-11-LPrivate LoRa link
Every output energizes
Output 1Output 2Output N
Information needed for selection
Describe the Site Before Choosing a Model
A short, specific site description is usually enough to pin down the topology and flag the details that still need checking.
- Control relationship: two points, one-to-many or all-node linkage
- I/O count: number of dry-contact inputs and relay outputs at each location
- Radio path: distance, obstructions, enclosure material and antenna location
- Field power: available 9–36 VDC supply and backup-power requirement
- Load: voltage, current, inductive characteristics and required contactor
- Required fail state: expected behavior after power or wireless-link loss
Source documents
Manual and Model Specifications
Use the shared manual for wiring, pairing and commissioning, then check electrical and mechanical details in the selected model's specification.
Shared manualY401 / Y402 / Y403 User ManualWiring, pairing and commissioning guidanceOpen manual
| Series | Model | Topology / I/O | Action |
|---|---|---|---|
| Y401Series | Y401-11-L | 1DI + 1DO per node · Point-to-point | Open specification |
| Y401-22-L | 2DI + 2DO per node · Point-to-point | Open specification | |
| Y401-44-L | 4DI + 4DO per node · Point-to-point | Open specification | |
| Y402Series | Y402-11-L | 1DI + 1DO per node · One-to-many | Open specification |
| Y402-44-L | 4DI + 4DO per node · One-to-many | Open specification | |
| Y402-4411-L | 1-channel master / 4-channel slave · One-to-four mapping | Open specification | |
| Y403Series | Y403-11-L | 1DI + 1DO per node · Multi-node linkage | Open specification |
Specifications include electrical and mechanical details for the selected model.
Selection questions
FAQ
These answers cover the current Y401, Y402 and Y403 family. For installation, the selected model's specification still governs.
What does a Wireless I/O Module do?
It reads a passive dry-contact or NPN open-collector input at one location and changes a linked relay output at another location over a private LoRa radio link. What exactly changes depends on whether you choose Y401, Y402 or Y403.
Which topology should I choose?
Choose Y401 for a two-location point-to-point link, Y402 for one master and multiple slave locations, and Y403 when any node input must activate all linked node outputs.
What input signals can connect to DI?
The digital inputs accept passive dry contacts or NPN open-collector signals. Never apply voltage to a DI terminal. Confirm the field-device output type before wiring.
What can the relay output switch?
The output is an SPDT dry-contact relay rated up to AC 277 V 5 A or DC 28 V 5 A. For high-power, motor or inductive loads, add a suitably rated contactor and surge suppression. The relay contact does not generate output voltage.
Can wireless I/O replace an emergency-stop or life-safety circuit?
No. Do not use this wireless link as the only emergency-stop, personnel-safety, life-safety or hard-real-time control path. Keep required safety functions on an independently designed and approved system.
Model selection / site review
Send the Control Relationship and Site Conditions
Tell us the number of locations, input and output points, approximate distance, obstructions, field power and intended load. We'll suggest a starting model or flag the site details still missing.
- Topology and model shortlist
- Radio-path and antenna questions
- Load and commissioning boundaries
Prefer to review documents first? Open the Y40 user manual .