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4G-LTE RS485 Modbus Gateway with 10 Digital Inputs.

Supports reading from up to 5 Modbus devices at the same time as reading from the Digital Input.
Each slave can have different configurations and data speeds.
It offers options for even, odd, or no parity settings with support for 7 or 8-bit frames.
The device can perform repetitive polling of the Modbus slaves to extract data, which is then transmitted through the data channel.
It supports both REST API and MQTT transmissions for data communication.

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Features

Modbus Simplex: The gateway supports Modbus communication from 1200bps to 115200bps.
Max number of Slaves: You can connect up to 5 Modbus slaves to the gateway.
Per Slave Register Sets: Each slave can have up to 20 register sets, with a maximum of 20 registers in each set.
Digital Inputs: The gateway has 10 digital inputs that can be monitored.
Minimum Report Interval: The gateway can report data at a minimum interval of 500ms.
Communication channel: RS485

Modbus Simplex

@1200bps - 115200bps

Max number of Slaves

Per Slave Register sets

20 (Max 20 Regs in each set)

Digital Inputs

Minimum Report Interval

500ms

Specifications

Operating Voltage: The gateway operates on a voltage range of 6-30v.
Modbus Wire: It requires a twisted pair of shielded cable for Modbus communication, with a maximum cable length of 1200mtr.
Digital Input Range: The digital inputs accept a voltage range of 3.5v to 30v, with a current of 0.09mA.
SIM: The gateway uses a microSIM card with 4G data capability.

Communication Channel

RS485

Communication Interface

2 Wire Type

Baud Rate

9600 – 115200 Kbps (SW selectable)

Modbus Simplex

@1200bps - 115200bps

Protocol Supported

Modbus RTU

Encryption

WEP64/WEP128/TKIP/AES

Data format

JSON

Input Voltage

6-30V DC

Power supply

12-24 VDC or 24 VAC

Isolation

750V

Connector

3mm pitch screw terminal blocks

Enclosure

Metal Enclosure

Antenna

External

Modbus Wire

Twisted pair Shielded Cable < 1200mtr

Installation Type

Plug and Play

Indication

Power, Sim, Communication & Publish

LED Indicator

Power, Net Act, Sim Status, LTE Status, Modbus Communication

Minimum Report Interval

400ms

Operating Temperature

-6 – 60 °C

Storage Temperature

-10 to 70°C

Operating Humidity

5 – 95% RH (non-condensing)

Analog Input

Input Channels

Digital Input Range

3.5v - 30v @0.09mA

Contact Rating

4-20mA with 12 bit SAR ADC (Transient Protected)(80 dB CMR)

Use cases of 4G-LTE Modbus Gateway with 10 Digital Inputs

Industrial Automation and Control: The Modbus Gateway can connect to various industrial devices and equipment, allowing remote monitoring and control. The 10 digital inputs can be used to monitor the status of sensors, switches, or alarms in an industrial environment.
Energy management systems: The gateway can integrate with energy meters, enabling real-time monitoring of energy consumption and facilitating energy management strategies. The digital inputs can be utilized to detect events such as power outages or equipment malfunctions.
Building automation and security: In building automation systems, the gateway can connect to sensors and security devices such as motion detectors, door/window sensors, or fire alarms. The digital inputs can detect and report events like unauthorized access or potential security breaches.
Environmental monitoring: With the help of environmental sensors connected to the digital inputs, the Modbus Gateway can monitor parameters like temperature, humidity, air quality, or water levels. This information can be used for environmental monitoring and control applications.
Remote equipment monitoring and maintenance: By connecting the gateway to equipment or machinery, it becomes possible to monitor their operational status and receive real-time notifications about faults or anomalies. The digital inputs can detect signals indicating equipment failures or maintenance requirements.
Smart agriculture: The Modbus Gateway can be used in agriculture to connect to sensors that monitor soil moisture, temperature, or irrigation systems. The digital inputs can help detect events such as water level fluctuations or weather changes, enabling efficient and automated farm management.

Frequently Asked Questions

The 4G-LTE RS485 Modbus Gateway is an industrial-grade edge communication device that connects serial field devices to cloud platforms over high-speed cellular networks. Engineered with 10 isolated digital inputs and an RS-485 serial bus, it gathers telemetry from energy meters, PLCs, and digital sensors, transmitting data securely via MQTT, HTTP, and Modbus TCP protocols with minimal reporting intervals.

Up to 32 Modbus slave devices can be daisy-chained simultaneously on the RS-485 multi-drop communication bus over distances up to 1,200 meters. The gateway queries individual slave device IDs (1 to 247) using configurable polling intervals, baud rates from 1200 to 115200 bps, and parity settings, packaging the register data into lightweight JSON payloads.

Key technical specifications include global 4G-LTE Cat-1/Cat-4 cellular fallback to 2G/3G, 10 optically isolated digital input channels (dry/wet contact support), RS-485 half-duplex differential signaling, and native support for MQTT, MQTTS with TLS 1.2/1.3, HTTPS REST APIs, and Modbus RTU-to-TCP conversion. It also features automatic network reconnect, local buffer storage during cellular blackouts, and remote OTA firmware upgrade capabilities.

The gateway complies with international industrial standards including CE, FCC, RoHS, and ISO 9001 quality certifications. It is engineered inside an IP30/IP65 flame-retardant DIN-rail mountable enclosure with integrated 15kV ESD surge protection, 1.5kV galvanic port isolation, reverse power polarity protection, and an extended operational temperature tolerance ranging from -40°C to +85°C.

Target industrial applications include smart grid electrical submetering, solar inverter power monitoring, industrial automation PLC telemetry, remote water treatment facility control, HVAC building management systems, cold-chain temperature tracking, and smart agricultural pump station automation where reliable long-range cellular connectivity and digital input state monitoring are essential.

FAQs

Q1. What is the 4G-LTE RS485 Modbus Gateway introduced by HashStudioz?

A1:

Increased Input Capacity: The module's ten input channels allow for the monitoring of a larger number of digital signals, suitable for applications that require multiple inputs.
Simplified Wiring and Space Efficiency: Consolidating ten input signals into a single module reduces wiring complexity, saving space and improving organization in control panels.
Enhanced Reliability and Safety: The isolation circuitry helps protect against electrical interference and voltage surges, enhancing the overall reliability and safety of the automation system.

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