The AF-GSM300-HW868 is a cutting-edge 4G wireless data acquisition module developed by Acrel, designed for reliable and real-time monitoring of up to 30 MODBUS RTU devices in industrial and energy environments. Built with an embedded Linux design, TCP/IP protocol stack, and intelligent watchdog system, the AF-GSM300 provides robust remote communication over RS485 and LORA networks. It supports multi-register acquisition, alarm triggering, and automatic data push to Acrel’s cloud platform, making it ideal for smart metering, industrial automation, and distributed data acquisition.

Technical Specifications

Feature	Specification
Model	AF-GSM300-HW868
Communication Type	4G Wireless + RS485 + LORA (868MHz)
4G Frequency Bands	LTE-FDD: B1–B28, LTE-TDD: B38–B41
Max Download/Upload Speeds	LTE-FDD: 150Mbps/50MbpsLTE-TDD: 130Mbps/35MbpsCDMA: 3.1Mbps/1.8MbpsGSM: 107Kbps/85.6Kbps
MODBUS Support	30 MODBUS RTU devices, 5 register blocks per device (≤64 registers/block)
Alarm Settings	Up to 14 alarm addresses per register field
SIM Card Support	1.8V/3V drawer type; powered-off installation only
Antenna Interface	SMA (female), 50Ω; external 4G-compatible antenna
Communication Interface	RS485 (115200bps)
Operating Voltage	DC 12V
Current Consumption	350–400mA @ 12V (400mA during dialing)
Installation	Wall-mounted
Dimensions	96mm × 67mm × 24mm
Operating Temperature	-40°C to +85°C
Storage Temperature	-40°C to +90°C
Humidity	0–95% RH, non-condensing

  Functions

• Collects data from multiple RS485 MODBUS RTU devices
• Communicates with Acrel cloud via secure protocol
• Alarm triggering based on user-defined register thresholds
• Supports both LORA and 4G for redundancy or extended coverage
• Web-based or host computer configuration via RS232
• Hot-swappable antenna and SIM card design (SIM requires power-off)
• Data polling and packet transmission for real-time updates
• LED indicators for signal, server status, and communication activity

Applications

• Industrial automation and process control
• Smart energy metering (electricity, gas, water, heat)
• Remote device monitoring in substations
• Renewable energy sites and solar plants
• IoT-enabled equipment with MODBUS protocols
• Utility data gateways with LORA or 4G uplink

Manufacturer Information

Acrel Co., Ltd., established in 2003, is a high-tech enterprise specializing in energy efficiency management and electrical safety solutions. With a comprehensive product line ranging from cloud platform software to sensors, Acrel offers smart energy meters, power sensors, and protection devices. Their products are widely utilized across industries such as electric power, communications, rail transit, petrochemical, and construction. In 2012, Acrel was listed on the Growth Enterprise Market with the stock code 300286.SZ. The company is committed to delivering innovative and reliable energy management solutions to its global clientele.