For industrial system integrators and OEM/ODM buyers that need a purpose-built 4G LTE gateway with serial device integration, the ZBT WD523 delivers exactly that. Built on the MediaTek MTK7628DA MIPS 24KC platform with MTK7628AN integrated 2.4GHz Wi-Fi, it combines a mini-PCIe module slot, RS485 and RS232 serial ports, a wide-voltage DC input (9–32V), four detachable SMB antennas with 1.5M cable length, and comprehensive global LTE band coverage — making it a dedicated platform for industrial IoT gateways, serial device bridging, utility monitoring, and rugged field equipment deployments across Europe, Asia, and Africa.
Built for Industrial Serial Integration and Wide-Voltage Environments
The WD523 stands apart from standard consumer and SMB 4G LTE routers by providing both RS485 and RS232 serial communication ports alongside the standard Ethernet and Wi-Fi interfaces. This makes it a native serial-to-4G gateway — allowing industrial controllers, PLCs, meters, sensors, and legacy serial devices to connect directly to the WD523 without an external serial converter or additional hardware.
The wide-voltage DC input (9–32V) accommodates the unregulated or fluctuating power rails common in industrial control cabinets, solar-powered field stations, and vehicle-mounted installations — without requiring a regulated 5V power supply. Combined with a mini-PCIe module slot and standard SIM card slot, the WD523 integrates with a broad range of 4G LTE modem modules for global carrier band coverage.
Hardware Architecture: MTK7628DA + MTK7628AN
The WD523 is built on a dual-chip architecture: the MTK7628DA MIPS 24KC CPU running at 580MHz handles routing, serial communication, and system management, while the MTK7628AN chipset provides dedicated integrated 2.4GHz Wi-Fi function. This separation of routing and wireless processing delivers stable, concurrent performance for both serial device communication and wireless client service.
With 64MB DDR2 RAM and 8MB Nor Flash integrated on the MTK7628DA, the WD523 runs lean industrial firmware reliably. The mini-PCIe module slot supports standard 4G LTE modem modules, and the compact low-profile black chassis is engineered for DIN rail mounting, equipment rack integration, and enclosed cabinet installations.
Interface & Connectivity at a Glance
Designed for Industrial Serial-to-4G Gateway and Rugged Field Deployments
The WD523 is purpose-built for industrial environments where serial device connectivity, wide-voltage power tolerance, and enclosed mounting are essential requirements alongside 4G LTE WAN access.
- EV Charging Site Connectivity: RS485 port connects EV charger controllers and energy meters directly to the WD523, enabling real-time charger status monitoring, usage data collection, and remote management over 4G LTE — ideal for unattended charging sites and distributed fleet operators.
- Industrial PLC and Controller 4G Connectivity: RS485 and RS232 ports connect PLCs, industrial controllers, and SCADA terminals directly to the WD523, bridging legacy serial devices to 4G LTE WAN and cloud SCADA platforms without external serial converters.
- Utility Metering and Remote Monitoring: Smart meters, environmental sensors, and utility monitoring equipment using RS485 or RS232 protocols connect natively to the WD523, transmitting data to cloud dashboards over 4G LTE across European, Asian, and African carrier networks.
- Solar and Off-Grid Power Station Gateways: The wide-voltage DC input (9–32V) allows the WD523 to operate directly from solar charge controllers, battery banks, and unregulated off-grid power supplies without additional DC-DC conversion hardware.
- ODM / OEM Industrial 4G Gateway Builds: ZBT's open mini-PCIe platform supports custom firmware, carrier-specific modem configurations, serial protocol customization, and white-label packaging for industrial solution providers building 4G gateway products for global markets.
The ZBT Platform Advantage
ZBT has delivered 4G LTE CPE and industrial IoT gateway solutions to carriers, enterprises, and system integrators across 60+ countries. The WD523 is built on ZBT's trusted ODM platform — combining MediaTek's proven dual-chip architecture with ZBT's manufacturing quality, direct procurement support, and volume pricing for B2B and industrial buyers worldwide.
Procurement & Integration
The WD523 is available for direct B2B purchase with volume pricing tiers, flexible NET payment terms for qualified buyers, and dedicated pre-sales technical support. ZBT's engineering team provides full datasheet packages, mini-PCIe modem compatibility lists, RS485/RS232 protocol integration guidance, firmware customization scoping, and integration assistance for industrial and ODM/OEM procurement workflows.
Sample units are available for qualified evaluations. Lead time, MOQ, and white-label configuration options are available on request.
Ready to Deploy the WD523?
Talk to our industrial sales team about pricing, sample units, and ODM/OEM customization options.
Contact Our Sales Team →