Usr-Tcp232-410S Serial to Ethernet Adapter - Dual Serial Device Server

In this review the Usr-Tcp232-410S is evaluated as a compact industrial serial to Ethernet adapter aimed at engineers and integrators who need reliable protocol bridging. The bottom line: it is best for projects that require simultaneous RS232 and RS485 connectivity with flexible network modes because it supports both serial standards at the same time, offers a Cortex-M4 based stack, and provides multiple networking options including TCP, UDP, HTTP and MQTT. For users who need simple, low-power data forwarding and Modbus gateway features, this device is a strong practical choice.

Key Features

• Dual serial ports: One RS232 port and one RS485 port can operate concurrently to connect legacy serial equipment and industrial buses without extra converters.
• Cortex-M4 processor: A 120 MHz CPU and embedded TCP/IP stack handle transparent data transmission and reduce latency for modest data loads.
• Flexible networking: RJ45 10/100 Mbps with auto-MDI/MDIX supports TCP client/server, UDP, HTTP client and MQTT modes for diverse deployments.
• Modbus gateway: Built-in Modbus RTU to Modbus TCP conversion and multi-host polling makes it suitable for PLC and SCADA integration and local or remote monitoring.
• Secure transmission: SSL/TLS support and two-way certificate authentication protect data in TCP client, HTTP client and MQTT operation modes.
• Low power industrial design: Terminal power supply, multiple status LEDs and a -40 to 85C operating range allow deployment in constrained industrial environments.

Who It's For

The device is aimed at system integrators, industrial automation engineers and IT staff who must bridge serial devices into Ethernet networks and cloud services. It is particularly useful where both RS232 and RS485 lines must be served simultaneously and when Modbus RTU devices need to be exposed as Modbus TCP endpoints or polled by multiple hosts.

It is less suitable for users who need very high throughput, complex edge computing, or an advanced GUI for device management; those users should consider higher-end gateways or devices with more processing headroom and richer management platforms.

Pros & Cons

Pros

• Supports RS232 and RS485 working at the same time, simplifying mixed-serial deployments.
• Modbus RTU to Modbus TCP gateway and multi-host polling reduce integration work with PLCs and SCADA systems.
• Multiple network modes and MQTT/HTTP/TCP/UDP support enable both on-prem and cloud reporting in JSON.
• Low power consumption under 1W and wide operating temperature for industrial installations.

Cons

• Functionality receives mixed feedback from customers, so advanced features or usability may require a learning curve.
• Not intended for very high bandwidth or heavy edge processing tasks due to its compact Cortex-M4 platform.

Specifications

Product type	Serial to Ethernet device server
Serial ports	1 x RS232, 1 x RS485
CPU	Cortex-M4, 120 MHz
Network	1 x RJ45 10/100 Mbps, auto-MDI/MDIX
Protocols	TCP, UDP, HTTP, MQTT, Modbus RTU/TCP
Operating temperature	-40 to 85C
Power consumption	< 1W

Our Verdict

The Usr-Tcp232-410S is a pragmatic, cost-effective serial to Ethernet adapter for industrial integration tasks where simultaneous RS232 and RS485 support, Modbus gateway capability and secure reporting are required. It offers good value for engineers needing reliable protocol bridging and cloud connectivity, though those needing heavy processing or advanced usability features should evaluate higher-end gateways.

Frequently Asked Questions

Can the device handle RS232 and RS485 at the same time?
Yes. The unit supports one RS232 port and one RS485 port operating concurrently for mixed-serial deployments.

Does it support secure connections for cloud reporting?
Yes. It supports SSL/TLS encryption and two-way certificate authentication for TCP client, HTTP client and MQTT modes.

Can it convert Modbus RTU to Modbus TCP?
Yes. It functions as a Modbus gateway and supports Modbus RTU to Modbus TCP conversion and multi-host polling.