23 mm wide. Zero compromise.
Nine I/O configurations in one ultra-slim DIN-rail form factor — digital, analogue, and RTD inputs with simultaneous multi-protocol communication. The aggregation layer between field sensors and your SCADA, PLC, or cloud platform.
Nine models. One footprint.
The Lynk Edge is built around a rich I/O hardware platform that covers every connectivity requirement found in industrial, building, and field automation environments.
STAC-IO DI
Digital Inputs
12-channel digital input module
Twelve-channel digital input module for dry-contact and wet-contact status monitoring, pulse counting, and limit-switch sensing — built into the same 23 mm DIN-rail body shared across the STAC-IO Series.
Channel Count
12 Digital Inputs — Dry-contact and wet-contact sensing for status, fault, and run signals from field equipment
Communication
RS485 / Ethernet / 4G — Simultaneous multi-protocol support across separate interfaces with no configuration conflict
Mounting
TS35 / EN 50022 — Tool-free DIN-rail clip mount, snaps on/off in seconds
Typical Use
Remote I/O Expansion — Replaces dedicated PLC I/O racks; status monitoring and pulse counting in distributed cabinets
STAC-IO DO
Digital Outputs
8-channel relay/transistor output module
Eight-channel relay and transistor digital output module for switching, control, and alarm annunciation — drives pumps, contactors, indicator lamps, and alarm panels directly from SCADA or cloud-triggered commands.
Channel Count
8 Digital Outputs — Relay / transistor outputs for switching, control, and alarm annunciation
Communication
RS485 / Ethernet / 4G — Same multi-protocol core as the rest of the STAC-IO Series
Control Source
SCADA / Cloud Trigger — Outputs can be driven by Modbus write commands, BACnet objects, or MQTT-published commands
Typical Use
Switching & Alarm Control — Pump starters, contactor control, alarm panel annunciation, indicator lamp drive
STAC-IO DIO
Mixed Digital I/O
Combined input/output module
Combines 12 digital inputs and 6 digital outputs in a single module — for applications that need to monitor and act in the same panel slot without provisioning two separate units.
Input Channels
12 Digital Inputs — Status monitoring and pulse counting on the same module as control outputs
Output Channels
6 Digital Outputs — Relay / transistor control outputs co-located with the monitoring inputs
Communication
RS485 / Ethernet / 4G — Full multi-protocol support shared across both I/O directions
Typical Use
Combined Monitoring & Control — Closed-loop logic where a sensed condition directly drives a local actuator
STAC-IO AI
Analogue Input
6-channel 4–20 mA process input
Six-channel analogue input module supporting standard 4–20 mA process signals — connects directly to pressure, flow, level, and other industrial transmitters for continuous process variable acquisition.
Channel Count
6 Analogue Inputs — Industry-standard 4–20 mA current loop input per channel
Sensor Compatibility
Any 4–20 mA Transmitter — Pressure, flow, level, and general-purpose process transducers
Communication
RS485 / Ethernet / 4G — Publishes process data simultaneously to SCADA and cloud platforms
Typical Use
Process Signal Acquisition — Continuous analogue monitoring feeding trend logs, alarms, and dashboards
STAC-IO emtherm
RTD / Thermocouple Input Module
4-channel direct temperature sensing
Four-channel RTD (PT100/PT1000) and thermocouple input module for direct industrial temperature sensing — connects straight to the sensor without an external transmitter, halving panel space versus a transmitter-plus-module approach.
Sensor Input
RTD (PT100/PT1000) or TC — Direct connection, no external transmitter required
Precision Fit
No Transmitter Needed — Removes a hardware layer compared to a 4–20 mA transmitter feeding an AI module
Communication
RS485 / Ethernet / 4G — Including native BACnet output for direct BMS integration
Typical Use
Process / Room Temperature — Direct duct, pipe, tank, or room temperature sensing for BMS and process monitoring
STAC-IO emNet
4G Compact Module
Inbuilt Temperature & Humidity Sensor
Compact 4G cellular variant combining 2 digital and 2 analogue inputs — publishes data directly to the cloud over cellular uplink with no on-premise gateway, LAN, or Wi-Fi infrastructure required.
I/O Mix
2 Digital + 2 Analogue — Compact input set sized for remote single-point monitoring
Connectivity
4G Cellular Only — No dependency on site LAN, Wi-Fi, or on-premise network infrastructure
Protocols
MQTT / JSON — Publishes directly to AWS IoT, Azure IoT Hub, or any MQTT broker
Typical Use
Remote Site Monitoring — Pump stations, substations, and agricultural sites with no local network
STAC-IO emnet MI
Ethernet Compact Module
Compact LAN/SCADA module
Compact Ethernet variant combining 4 digital inputs and 2 digital outputs — built for SCADA and LAN integration in the smallest available STAC-IO footprint, ideal where panel space is the binding constraint.
I/O Mix — 4 Digital In + 2 Digital Out
Compact monitoring-and-control set for smaller panel applications
Connectivity
Ethernet Only — Direct LAN connection for SCADA and BMS network integration
Protocols
Modbus TCP / BACnet — Native protocol support for existing Ethernet-based control systems
Typical Use
Compact SCADA / LAN Integration — Where space allows only the smallest module but full SCADA visibility is still required
STAC-IO emALERT
Alert / Alarm Output Module
Notification & event-triggered output module
Dedicated alarm output module for notification systems and event-triggered outputs — designed to sit alongside sensing and monitoring modules on the same rail, converting flagged conditions into immediate annunciation.
Function
Dedicated Alarm Output — Converts threshold or event conditions from other STAC-IO modules into annunciation signals
Communication
RS485 / Ethernet — Modbus and BACnet support for integration with existing alarm management systems
Deployment
Same-Rail Companion — Sits alongside DI, AI, or emtherm modules on the same DIN rail for a complete monitoring-and-alerting station
Typical Use
Notification Systems — Event-triggered alarm panels, horn/strobe drive, and BMS alarm point annunciation
Four protocols, running at once.
A single STAC-IO module can serve Modbus RTU to an existing SCADA system over RS485 while simultaneously publishing to an MQTT cloud broker over 4G — with zero configuration conflict.
Modbus RTU
Hardwired industrial bus over RS485 — up to 32 devices on one segment
Modbus TCP
Ethernet-based Modbus for SCADA, HMI, and modern control platforms
BACnet
Building automation protocol — connects natively to BMS and DDC controllers
MQTT / JSON
4G cellular connectivity for direct-to-cloud publishing and analytics platforms
Sectors that run on STAC-IO
DIN-rail integration, multi-protocol connectivity, and reliable I/O aggregation across industrial and building sectors.
Manufacturing
Production line status, machine health, OEE dashboards via Modbus RTU integration.
Building Management
BACnet connectivity for BMS controllers, DDC panels, and room-level RTD sensing.
Power & Utilities
Energy meter pulse monitoring, current transformer inputs, SCADA energy management feeds.
Oil, Gas & Water
Field panel installations bridging legacy SCADA with modern cloud monitoring over 4G.
Real deployments
How teams across sectors apply the STAC-IO Series to solve industrial integration and remote monitoring challenges.
Temperature & Humidity Monitoring
Deployed across a multinational facility to maintain precise climate control — with an automated escalation matrix that triggers alerts the moment HVAC systems deviate.
Condition Monitoring
Implemented for a leading crane manufacturer to deliver real-time equipment health updates, keeping maintenance teams ahead of failures before they happen.
Enhancing Capabilities
Commissioned by a large government defence organisation to expand I/O capabilities on existing control systems — without replacing the infrastructure already in place.