Name: Industrial 4G Data Logger Gateway
Brand: Revan Technology

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The Industrial 4G Data Logger Gateway is a 9–36 V DC DIN-rail field acquisition module. It reads analog and digital channels plus Modbus devices on RS485, then publishes MQTT/HTTP JSON over Ethernet or 4G. There is no relay output — the focus is multi-channel measurement, local SD logging and per-channel alarms. Channel names, scaling, thresholds and broker settings are edited in the onboard WebUI.

Where the Industrial 4G Data Logger Gateway is used

Typical jobs: warehouse or panel temperature/humidity, water-treatment and greenhouse sensor lines, meter / pressure-transmitter polling, or collecting 5–10 remote points in one box. PCB design and firmware share the same board, so a PLC + GSM modem + I/O stack is often unnecessary. The engineering line matches What We Do.

How it works

On boot the module joins the LAN on Ethernet (10/100); the WebUI opens at the device IP. Channels are sampled on a set period, scaled and written to a ring buffer. Ethernet is the preferred uplink; if it drops, 4G LTE Cat-1 (A7670E) takes over. While offline, SD logging continues; when the link returns, store-and-forward pushes the backlog. There is no “always online” claim — delay depends on the cell network and SIM plan.

Hardware

4–8× universal analog inputs: 0–10 V / 4–20 mA / NTC
4–8× digital inputs: dry contact / pulse
1× RS485 (Modbus RTU, multi-slave poll)
Ethernet 10/100 + 4G LTE Cat-1 (A7670E)
SD card slot — local ring-buffer log
Supply 9–36 V DC with TVS and reverse-polarity protection
Status LEDs: power, Ethernet, GSM, RS485, logging
DIN-rail / panel mount, screw terminals, SMA antenna

Software

Built-in WebUI — channel name, unit, scale, calibration
Per-channel alarm threshold and hysteresis
MQTT / HTTP JSON publish
SD ring buffer + upload after reconnect
Modbus slave poll scheduler and error counters

Technical specifications

Supply	9–36 V DC
Analog inputs	4–8× universal (0–10 V / 4–20 mA / NTC)
Digital inputs	4–8× (dry contact / pulse)
Comms	Ethernet 10/100, 4G LTE Cat-1 (A7670E), RS485 Modbus RTU
Publish	MQTT / HTTP JSON
Logging	SD card ring buffer
Web UI	Built-in browser WebUI
Mounting	DIN rail / industrial cabinet

A 4–20 mA loop needs an external transmitter; the board does not source 24 V loop power. NTC curves are selected in the WebUI. RS485 termination and slave addresses follow the project. This unit does not replace a safety relay or e-stop chain.

Installation and safety

Take supply from the cabinet 24 V DC rail and respect terminal polarity. Confirm AI/DI channel types in the WebUI before wiring sensors. Run Ethernet to the switch and place the SMA antenna outside a metal cabinet when possible. Fit a 4G SIM and set the APN. Keep critical safety functions on dedicated safety devices.

Frequently asked questions

What is the Industrial 4G Data Logger Gateway?

A DIN-rail data logger/gateway with Ethernet and 4G. It provides multi-channel analog/digital inputs, Modbus polling, SD logging and MQTT/HTTP publish — without relay control.

Does it replace the IP & 4G Smart Relay?

No. The smart relay focuses on remote power cycling and IP watchdog. This gateway focuses on multi-channel acquisition and cloud uplink. Same product-family DNA, different jobs.

Is data lost when the internet drops?

Measurements continue into the SD ring buffer. After reconnect, the backlog is pushed via MQTT/HTTP. When the card fills, the oldest samples are overwritten.

How many Modbus slaves can it poll?

v1 depends on the poll scheduler and timeout budget. A few slaves are typical in a cabinet; dense buses need a longer poll period.

Which protocols are supported?

WebUI (HTTP), MQTT/JSON, HTTP publish and Modbus RTU on RS485. OPC UA and BACnet are not onboard; bridge them on the server if needed.

Contact Revan Technology for a quote and cabinet layout. Channel list, terminal map and a sample WebUI screen are shared in the project pack.