NGW-1set Low Cost TCP/IP to RS485 RS232 Converter - Modbus Gateway

In this review the NGW-1set is examined as a low cost serial-to-Ethernet gateway aimed at engineers and integrators who need reliable Modbus bridging without complex configuration. The single biggest reason to buy is straightforward: it converts RS232 and RS485 serial lines to TCP/IP with simultaneous port operation and native Modbus RTU to Modbus TCP support, making it a practical choice when legacy serial devices must be placed on an Ethernet network. The review focuses on real-world setup, main features, and where this unit is most useful.

Key Features

• Dual serial ports: RS232 and RS485 ports can operate simultaneously so mixed serial devices can be connected and bridged to Ethernet without swapping adapters.
• Modbus gateway: Built-in Modbus RTU to Modbus TCP translation and Modbus polling simplify integrating legacy controllers into modern SCADA or PLC networks.
• Flexible flow control: Supports CTS/RTS hardware flow control and XON/XOFF software flow control, reducing data loss on busy serial links.
• Network reliability: Two network links and hardware watchdog support improve uptime for industrial deployments where stable connectivity is required.
• Configuration options: Can be configured through a web page or companion software, allowing both local and remote setup without vendor-only tools.

Who It's For

The NGW-1set is for industrial technicians, system integrators, and electricians who need an economical way to bring RS232 and RS485 devices onto Ethernet and to translate Modbus protocols. It suits factory floors, building automation, and remote telemetry projects where a compact, dependable serial device server is required.

Those who should look elsewhere include users needing a plug-and-play consumer device with phone-style setup, or installations demanding broad vendor firmware ecosystems such as full MQTT/SSL out of the box unless the special firmware is procured; advanced cloud-first solutions may require a different device.

Pros & Cons

Pros

• Combines RS232 and RS485 concurrently, removing the need for separate adapters and simplifying mixed-port systems.
• Integrated Modbus RTU to Modbus TCP and polling make it effective as a protocol gateway in SCADA setups.
• Industrial-grade design with TI Cortex-M4-based solution and wide -40~85C operating range for harsh environments.
• Multiple indicators and a hardware watchdog enhance reliability and ease of troubleshooting on-site.

Cons

• MQTT/SSL requires special firmware, so secure IoT use is not immediate without additional steps or firmware options.
• Not a consumer plug-and-play product; professional setup via web or software is expected for full functionality.

Specifications

Model	NGW-1set
Serial ports	RS232 and RS485 (dual, operate simultaneously)
Protocol support	Modbus RTU to Modbus TCP, Modbus Polling
Flow control	CTS/RTS hardware, XON/XOFF software
Processor	Industrial TI Cortex-M4 solution
Operating temperature	-40~85C
Configuration	Web page or software

Our Verdict

The NGW-1set is a practical, value-oriented serial device server for integrators needing to bridge RS232 and RS485 equipment to Ethernet and to translate Modbus protocols. Its simultaneous port operation, industrial design, and web-configurable interface offer a dependable, low cost solution for on-site SCADA and building automation projects, though secure MQTT use requires optional firmware.

Frequently Asked Questions

Can RS232 and RS485 work at the same time?
Yes. The NGW-1set supports RS232 and RS485 ports operating simultaneously so mixed serial devices can be connected at once.

Does it support Modbus conversion?
Yes. It provides Modbus RTU to Modbus TCP translation and includes Modbus polling functionality for gateway use.

Is secure MQTT available by default?
Not by default; MQTT and SSL are available via special firmware rather than the standard firmware image.