Solar-Powered 4G Smart Data Acquisition Terminal

Product Details

1 Product Overview

DAQ-SP-RTU4G is a cost-effective industrial-grade 4G remote intelligent terminal launched by Shanghai DAQ IoT Technology Co., Ltd. It integrates lithium battery power supply, solar charging, multiple I/O, analog acquisition, RS485 communication, 4G full-network access and multi-platform connectivity, providing a stable and reliable wireless transmission and control solution for scenarios such as remote device control, status monitoring, sensor data acquisition and unattended site operation.

The device adopts a wide-temperature design with strong anti-static protection and a hardware watchdog. It supports access to mainstream IoT platforms and SSL encrypted transmission, and can be widely used in remote monitoring scenarios such as smart agriculture, smart water conservancy, industrial IoT, environmental monitoring, security access control, and PV/energy-storage stations.

3 Executive Standards

General specification for industrial wireless communication equipment

Electrostatic discharge immunity test standard GB/T-17626.2

Reliability design specification for wide-temperature industrial products

4 Product Features & Parameters

4.1 Core Functional Features

• 4G communication: Cat1 4G full network, supporting China Mobile / China Unicom / China Telecom

• Power supply: 3.3–4.2V lithium battery, with voltage acquisition supported

• Charging: 5–18V solar charging (5V/12V solar panel), with charging voltage acquisition supported

• Anti-static: contact discharge ±8KV, air discharge ±15KV

• Control output: 1 channel solenoid valve drive (12V/1A); 1 channel controllable power output (12V/300mA)

• Signal input: 2 channels of dry contact signal input detection

• Analog: 2 channels of 4-20mA analog acquisition

• Communication interface: 1 channel RS485

• Clock and storage: 1 channel RTC local clock; 1 channel SPI Flash (8M bytes)

• Stability: hardware watchdog, stable operation without freezing

• Firmware and protocol: transparent transmission firmware supported; TCP/UDP/MQTT/HTTP/WebSocket supported; SSL encryption supported (TCPS/MQTTS/HTTPS)

• Platform compatibility: Alibaba Cloud IoT, Tencent IoT, OneNet, Huawei IoT, China Telecom Cloud, Tuya Cloud, etc.

• Customization: LOGO customization and secondary development customization supported

4.2 Electrical Characteristics

• Supply voltage: DC 3.3–4.2V (lithium battery)

• Charging voltage: DC 5–18V (solar)

• Solenoid valve drive: 12V/1A (max)

• Controllable power output: 12V/300mA (max)

• Dry contact input: 2 channels

• Analog acquisition: 2 channels (4-20mA)

• RS485: baud rate 1200–230400; data bits 8; stop bits 1/2; parity odd/even/none

• ESD protection: contact ±8KV, air ±15KV

4.3 Network Characteristics

• Network standard: Cat1 4G full network

• LTE-FDD: B1/B3/B5/B8

• LTE-TDD: B34/B38/B39/B40/B41

• Protocols: TCP, UDP, MQTT, HTTP, WebSocket, SSL encryption

• Platforms: full coverage of mainstream IoT cloud platforms

• SIM: chip SIM, stable and reliable, supporting conformal coating

4.4 Structure & Installation

• Dimensions: 174.5mm × 140.5mm × 43mm

• Installation: M3 screw fixing

• Operating temperature: -35℃ ~ +75℃

• Operating humidity: 5% ~ 95% RH (non-condensing)

5 Core Advantages

• 4G full network, wide coverage and low cost: Cat1 module, universal for the three major operators, flexible deployment and simple maintenance

• Lithium battery + solar dual power supply: suitable for field sites without mains power, low power consumption and long endurance

• Multiple acquisition and multiple control in one: full coverage of dry contact / analog / RS485 / power output / solenoid valve drive

• Strong protection and high reliability: wide temperature, high anti-static, hardware watchdog, stable operation in industrial sites

• Multi-platform compatibility + encryption: supports mainstream cloud platforms, with SSL encryption for greater security

• Minimal deployment + customizable: simple wiring, supporting LOGO and secondary development for rapid project implementation

6 Application Scenarios

• Smart agriculture: remote control of solenoid valves, soil/weather sensor acquisition

• Smart water conservancy/water affairs: pipeline network monitoring, valve control, liquid level/flow monitoring

• Industrial IoT: equipment status monitoring, remote meter reading, energy consumption monitoring

• Environmental monitoring: wireless upload of sensors for dust, temperature and humidity, noise, etc.

• Security access control: remote reporting and linkage control of door magnetic, infrared and alarm signals

• PV/energy storage/base stations: telemetry and remote control, status monitoring, abnormal alarms

• Unattended sites: remote operation of equipment rooms, pumping stations, gas stations and heating stations

7 Installation Notes

1. Confirm the battery voltage is 3.3–4.2V; the positive and negative poles must not be reversed

2. Match the solar panel to the 5V/12V setting and avoid reverse connection

3. Wire the dry contact / analog / RS485 strictly according to the wiring diagram to avoid short circuits

4. Install in a place free of strong vibration and strong electromagnetic interference

5. For outdoor installation, provide sun and rain protection and ensure ventilation and heat dissipation

6. Check the wiring before powering on: connect the battery first, then the solar panel, to avoid surges

7. Long-press Reload for 7 seconds to restore factory settings and reconfigure parameters

8. Firmware upgrade is done via USB or remotely; do not cut power during the upgrade