Industrial RS485 to WiFi Converter with native MQTT and Modbus RTU → TCP bridging. Send your field data to the cloud without pulling a single cable.
Excl. GST · Industrial pricing · Free shipping above ₹10,000
How it works
Connect your Modbus RTU devices to the screw terminals. The MDIM-485/WL exposes them over WiFi as Modbus TCP and publishes register values to your MQTT broker. SCADA, cloud dashboards, and edge apps all see the same live data.
As an RS485 WiFi gateway, it polls each RTU slave on the serial bus the same way a wired converter would — the difference is only in how that data leaves the box. Register values go out over WiFi to whichever path you configure: a Modbus TCP connection for SCADA, or straight to an MQTT broker as an RS485 MQTT gateway for a cloud platform. Either path runs off the same physical RS485 wiring, unchanged.
PLC / Meter
Modbus RTU
RS485
MDIM-485/WL
WiFi Bridge
WiFi · MQTT
SCADA / Cloud
TCP / MQTT
Wireless reach
2.4 GHz 802.11 a/b/g/n radio with up to 100 m line-of-sight range using the stock antenna. That figure is a clear-line-of-sight best case — metal panels and walls cut it down, so a typical factory-floor deployment plans around 30–60 m as the working number, with an external high-gain antenna as the option to extend it further. Retrofit existing buildings, monitor distributed solar farms, or relocate equipment without rerouting cables.
802.11 a/b/g/n
2.4 GHz, up to 150 Mbps
Native MQTT
AWS, Azure, ThingConnect
Up to 100 m
Line-of-sight free-space range
Multi-client TCP
SCADA + MES + historian
Built for the factory floor
Metal housing, surge and ESD protection on the RS485 line, dual 6–24 VDC power input, 5–95% humidity tolerance. Designed to live inside the panel, not on a desk.
Wide thermal range
-40 °C to 75 °C operating
Line protection
Surge + ESD on RS485
Dual power input
6–24 VDC terminal or jack
Metal housing
160 g, 82 × 51.5 × 23 mm
MDIM Manager
Free Windows utility to set SSID, password, security mode, IP, MQTT topic, and register mappings. Web-based configuration also available on the device IP.
Why this over a generic converter
Bare RS485-to-WiFi modules imported from overseas can look cheaper on paper. The real cost shows up later — a 12-month warranty instead of 2, a cross-border RMA when a unit fails, and a support ticket that has to cross a time zone. The MDIM-485/WL is priced to be the cheaper option once you account for what you actually get: an India-stocked, DIN-rail, metal-housing industrial converter with local warranty and support — not the absolute lowest price of a bare import module before duties and shipping are added.
| MDIM-485/WL | Typical imported converter | |
|---|---|---|
| Assembled | Coimbatore, India | Overseas (China, Taiwan, etc.) |
| Warranty | 2 years | Commonly 12 months |
| Replacement / RMA | Handled locally, no overseas shipping | Cross-border return, weeks of transit |
| Technical support | Direct WhatsApp + phone, India hours | Support ticket queue, overseas hours |
Where it fits
A PLC or VFD on the far side of a shop floor often sits past where a data-network cable was ever run. Instead of pulling new conduit through an active plant, the MDIM-485/WL joins the existing WiFi network and puts the same Modbus RTU registers SCADA needs onto Modbus TCP or MQTT — no cable tray, no shutdown.
HVAC controllers, energy meters, and BMS panels installed during original construction rarely have spare network drops nearby. A wireless bridge means a retrofit into a modern building-management system doesn't require reopening ceilings or walls to run new cable — the RS485 wiring already there stays exactly as it is.
Inverters and BMS units on a solar farm are typically spread across acres, far past where wired Ethernet was ever planned for. WiFi coverage between inverter rows is usually easier to get than trenched cable, so live voltage, current, and state-of-charge data can reach a central dashboard without a civil-works project.
Tank level sensors, water-quality probes, and pump controllers are often at the edge of a site, sometimes outdoors, where running cable back to a control room is impractical. Publishing register values straight to an MQTT broker means an alert on a level or quality threshold can reach an operator's phone in near real time.
Traffic controllers, signaling cabinets, and tunnel ventilation equipment are distributed across a site by nature — pulling a dedicated network cable to each one isn't realistic. A WiFi bridge on the existing RS485 controller lets each cabinet report status without its own trenched connection back to a central office.
Irrigation controllers, soil-moisture sensors, and greenhouse automation are usually out in the field, well past where structured cabling exists. Bridging them to WiFi and MQTT means a farm manager can check and adjust a controller from a phone instead of walking the field or running conduit across open ground.
Need a wired connection instead of WiFi? See the RS485 to Ethernet Converter.
Specs
A few numbers below matter more than they look: the -40 to 75 °C range covers an unconditioned outdoor cabinet or a solar-farm enclosure, not just an air-conditioned server room. The 50 bps – 921.6 kbps baud range means the same gateway works whether the RS485 bus was commissioned at a cautious 9600 bps or configured faster. Dual power input (screw terminal or barrel jack) means the same unit fits a permanent panel install or a bench test rig without an adapter. Datasheet DS_MDIM485_WL v1.1, released Oct 7, 2025 — see Resources below for the full PDF.
Communication
Electrical
Physical
Environmental
Resources
FAQ
New to the protocols? Read our RS485 guide or What is Modbus?
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