U881-CN Industrial 4G Wireless Router Module TTL Serial GPS Supported Embedded Routing Module

U881-CN Product Overview

The U881-CN is an industrial-grade 4G wireless router module with an embedded modular design. It supports 4G LTE network access, provides 2.4GHz 802.11n 300Mbps Wi-Fi and Fast Ethernet interfaces. The module features TTL serial communication (RX/TX) for easy data exchange with various industrial devices, and supports GPS positioning for location tracking and asset monitoring. With complete routing capabilities including data transparent transmission, VPN, wireless bridging, and APN, the U881-CN is ideal for security surveillance, industrial control, power, petroleum, coal mining, intelligent transportation, and other industrial IoT (IIoT) applications.

U881-CN Core Features

Industrial 4G LTE：The U881-CN supports 4G LTE network access with SIM card slot, compatible with China Mobile, China Unicom, and China Telecom networks.

TTL Serial Communication：The U881-CN supports TTL serial interface (RX/TX) for easy data exchange with embedded devices, MCUs, and sensors.

GPS Positioning：The U881-CN has built-in GPS support for device location tracking and asset monitoring.

2.4GHz Wi-Fi：IEEE 802.11b/g/n support with wireless speeds up to 300Mbps.

Fast Ethernet Ports：Provides WAN and LAN ports with wired/4G link backup for stable connectivity.

Embedded Modular Design：Castellated holes or pin headers for easy integration into various industrial equipment, supports custom development.

Complete Routing Functions：Data transparent transmission, VPN, wireless bridging, APN, port forwarding, remote management, and more.

Wide Operating Temperature：Industrial-grade design with -20℃ to +70℃ operating temperature range.

U881-CN Applications

The U881-CN is widely used in security surveillance systems, power automation and remote meter reading, petroleum and coal mining communications, industrial control and equipment monitoring, intelligent transportation and vehicle tracking, meteorological and water conservancy monitoring, financial and communication industries, and other scenarios requiring stable 4G wireless data transmission.

U881-CN Key Advantages

TTL Serial + GPS Integration：The U881-CN combines TTL serial communication and GPS positioning in a single module, ideal for industrial IoT applications requiring location tracking and serial data acquisition.

4G + WiFi + Wired Triple Backup：The U881-CN supports 4G cellular, 2.4GHz Wi-Fi, and wired Ethernet with intelligent link backup to ensure always-on connectivity.

Embedded Design for Easy Integration：The U881-CN’s modular design with castellated holes or pin headers allows easy embedding into various industrial equipment, development boards, and end products.

Remote Management & Maintenance：WEB configuration and remote cloud management with remote upgrade and configuration support, significantly reducing on-site maintenance costs

Why Choose QIXINWEI

Years of experience in the electronics industry. Trusted by global customers.

Massive In-Stock Inventory – Ready to ship promptly

BOM Matching Service – One-stop solution, save time

PCBA Customization – Professional engineering team creates tailor-made solutions based on your needs

Cost-Effective & Efficient – Better channel, better cost

A dedicated team makes your procurement smoother.

Contact us for BOM quotes or PCBA inquiries

FAQ

1. What is the U881-CN Industrial 4G Wireless Router Module?
The U881-CN is an embedded industrial-grade 4G wireless router module. It supports multiple access methods including 4G cellular networks, Wi-Fi wireless LAN (802.11 b/g/n), and wired Ethernet, enabling seamless connection between wireless LAN and WAN. The U881-CN supports serial port DTU data transparent transmissionand optional GNSS/GPS positioning, providing stable and reliable network access and data transmission for industrial devices.

2. What are the key specifications of the U881-CN module?
The U881-CN supports IEEE802.11b/g/n Wi-Fi standard, operates in the 2.4GHz band, with Wi-Fi transmission rates up to 150-300Mbps. It is equipped with 2 10/100M adaptive Ethernet ports (1 WAN/LAN auto-sensing), 1 RS232/485 serial port, and 1 SIM card slot. The U881-CN supports IEEE802.11b/g/n, 4G LTE, and other network standards, compatible with hundreds of 4G wireless modules with plug-and-play capability.

3. What core chip does the U881-CN module use?
The specific core chip model used in the U881-CN is not explicitly specified in publicly available information. Some similar 4G communication modules in the same series use ASR chip platforms, while others use MTK or other solutions. Please contact the module supplier directly or refer to the official product datasheet for accurate chip information.

4. What network frequency bands does the U881-CN module support?
The specific band support list for the U881-CN is not explicitly listed in publicly available information. The U881-CN supports China Mobile, China Unicom, and China Telecom 4G full-network access, and is also compatible with 3G networks including WCDMA/EVDO/TD-SCDMA. Specific band configurations may vary by batch or custom version — please refer to the product specification sheet for details.

5. What applications is the U881-CN module suitable for?
It is suitable for electric power, petroleum, coal mining, finance, communications, public security, heating, industrial control, meteorology, water conservancy, transportation, and municipal applications. Typical applications include: 4G network image transmission (e.g., security surveillance), serial data transparent transmission, VPN secure tunnel communication, remote device monitoring and management, as well as vehicle diagnostics and control (with optional opto-isolated I/O interfaces).

6. What development tools support the U881-CN module?
The U881-CN supports WEB-based configuration for easy management; supports remote cloud control for remote upgrades and configuration. Also supports serial TFTP and Web software upgrades, as well as serial AT command control and configuration. Compatible with operating systems including Windows XP/VISTA/Linux 2.6/Windows 7 and above/MAC OS, etc..

7. What is the operating temperature range of the U881-CN module?
The specific operating temperature range of the U881-CN is not explicitly specified in publicly available information. As an industrial-grade module, industrial products typically operate within -20℃ to +70℃ or wider ranges. Please refer to the official product datasheet for the exact temperature specifications.

8. Does the U881-CN module support GPS positioning?
Yes. The U881-CN optionally supports GNSS positioning modules with RTK technology and multi-satellite systems. GPS/BeiDou positioning data can be acquired and transmitted via the TTL serial interface. GPS functionality may vary by hardware version — please refer to the product specification sheet for details.

9. What security features does the U881-CN module have?
The U881-CN supports VPN secure tunnel functions including PPTP and L2TP; supports IPTABLES firewall to prevent malicious attacks; supports MAC address filtering, access control, port blocking, and anti-DoS attack protection; supports multiple WLAN security modes including WPA-PSK and WPA2-PSK encryption. The device also features software and hardware watchdog anti-crash designs to ensure stable and reliable operation.

10. What peripheral interfaces does the U881-CN module support?
The U881-CN supports 2 10/100M Ethernet ports (1 WAN/LAN auto-sensing); 1 RS232/485 serial port; 1 SIM card slot; 1 IPEX 1st-gen antenna interface (Wi-Fi); 1 DC power input and reset button; optional multiple antenna interfaces (1-4); optional 2-channel analog input/control output (opto-isolated). Also supports USB interface. The module also supports DDNS dynamic domain services, port mapping, DMZ host, and other functions.