When you need to network legacy serial devices with modern IP networks, a reliable serial to IP adapter is essential. The following selections cover single and multi-port options, Web UI management, DHCP/DNS support, and built-in features like TCP client/server modes and PoE. This guide highlights five popular adapters to help you compare capabilities and choose the best fit for POS, sensors, industrial controllers, or home automation systems. All choices provide data-transparent transmission between RS232/RS485 and Ethernet or TCP/IP networks.
| Product | Brand | Key Feature |
|---|---|---|
| USR-TCP232-302 Tiny Size RS232 to TCP IP Converter | PUSR | DHCP/DNS, transparent RS232 to Ethernet, web-based configuration |
| StarTech 1-Port Serial to Ethernet Adapter | StarTech | Single port, TCP client/server, unified management UI |
| USR-TCP232-304 RS485 to TCP/IP Server | PUSR | RS485 to Ethernet, DHCP/DNS, built-in web page |
| Global Caché IP2SL iTach TCP/IP to Serial Converter | Global Caché | Turns RS232 devices into IP-enabled, remote control via Ethernet |
| StarTech 4-Port Serial to Ethernet Adapter | StarTech | Four ports, serial tunneling, configurable settings |
Note: Each product enables remote serial device access over IP networks, suitable for POS systems, sensors, CNC controllers, and automation. The table above highlights core strengths to help you shortlist by port count, management features, and network capabilities.
USR-TCP232-302 Tiny Size RS232 To TCP IP Converter
This device functions as a serial RS232 to Ethernet server, enabling bidirectional, transparent transmission between RS232 and Ethernet. It integrates TCP/IP protocol support and can obtain IP addresses via DHCP. A built-in webpage allows parameter configuration, and firmware can be upgraded over the network. The RJ-45 port supports 10/100 Mbps, with a serial baud rate range from 600 bps to 230.4 Kbps. It supports parity options None, Odd, Even, Mark, and Space, and includes Auto-MDI/MDIX support for straightforward installation. Use cases include remote device networking and industrial control systems requiring simple serial to IP bridging.
StarTech 1-Port Serial To Ethernet Adapter
StarTech’s single-port serial device server provides remote RS232 connectivity over an IP network. It supports TCP client/server modes, enabling serial tunneling across a LAN. The DB9 serial port can handle up to 921.6 Kbps. It is TAA compliant and offers a unified management experience with a consistent Web UI across StarTech device servers. The product supports exporting and importing settings, custom naming, location tagging, admin password protection, and firmware upgrades, making it suitable for POS systems, barcode scanners, and sensors requiring reliable remote access.
USR-TCP232-302 Tiny Size RS232 To TCP IP Converter (2)
This variant reiterates the USR-TCP232-302 capabilities: a compact serial device server for transparent RS232 to Ethernet transmission. It includes DHCP support, DNS querying via serial setting protocol, and a web-based parameter configuration interface. The device supports automatic IP address assignment, Auto-MDI/MDIX, and a 10/100 Mbps RJ-45 port. Baud rates range from 600 bps to 230.4 Kbps with parity options None, Odd, Even, Mark, and Space. It is ideal for small deployments requiring a discreet, low-cost serial-to-IP bridge for industrial or commercial equipment.
USR-TCP232-304 Serial RS485 To TCP/IP Ethernet Server
USR-TCP232-304 provides transparent data transmission between TCP/IP networks and RS485 serial devices. It supports DHCP for IP address assignment and includes a serial setting protocol for configuration. The device features a built-in Auto-MDI/MDIX RJ-45 port at 10/100 Mbps, with a baud rate range from 600 bps to 230.4 Kbps. Parity options include None, Odd, Even, Mark, and Space. This model is well-suited for RS485-based field devices, industrial controllers, and automation networks needing efficient network-enabled RS485 bridging.
StarTech USB To Serial Adapter – 2 Port (ICUSB2322I)
This 2-port USB-to-RS232 adapter provides robust, rugged performance with a metal enclosure and DIN Rail compatibility. It is designed for industrial settings and supports retention of COM ports in software, ensuring compatibility with legacy software that relies on stable COM assignments. While not a direct Ethernet bridge, this device is complementary for connecting multiple RS232 devices to PCs or embedded systems, enabling local serial monitoring when paired with network-enabled adapters on the same network.
Global Caché IP2SL iTach TCP/IP To Serial Converter
The IP2SL converts RS232 serial devices into IP-enabled clients and servers for remote control. It supports connecting serial devices to the internet via wired TCP/IP connectivity, enabling remote monitoring and automation. A DB9 connector supports data rates from 1200 baud to 115.2Kbaud, providing fast, reliable connections when bridging serial devices to a network. This model is widely used in audio-visual systems and home automation where RS232 control devices must be accessible over IP.
StarTech 4-Port Serial To Ethernet Adapter
This four-port device server enables remote access for multiple RS232 devices over a network. It is ideal for environments with several serial peripherals such as POS systems, barcode readers, sensors, and CNC controllers. Features include TCP client/server mode for serial tunneling, export/import of settings, and robust firmware upgrade options. The multi-port design supports more complex industrial setups while maintaining a unified management interface across devices.
StarTech 1-Port Serial To Ethernet Adapter With PoE
This single-port device server includes PoE support, enabling power over Ethernet for simplified installation. It maintains the standard features of a serial-to-IP bridge, including TCP client/server modes, ease of setup via a Web UI, and a compact footprint suitable for wall or DIN rail mounting. It is well-suited for deployments where Ethernet power is preferred or required, reducing cable clutter and power supply needs for remote serial devices.
Buying Guide: Key Purchase Considerations
- Port count: Determine how many serial devices you need to connect. Single-port devices are compact and affordable; multi-port units simplify management for large deployments.
- Network features: Look for DHCP/DNS support, Web UI configuration, and firmware upgrade options. These simplify setup and future updates.
- Throughput and baud rates: Ensure the device supports your serial device’s baud rate and data rate requirements. Higher speeds improve performance for real-time data like POS or CNC signals.
- Protocol support: TCP client/server modes and serial tunneling enable flexible architectures across LANs and WANs. Consider Auto-MDI/MDIX for easier cabling.
- Power options: PoE support can reduce clutter and simplify installations. If PoE is not available, ensure a nearby power source.
- Security: Check for password protection, firmware updates, and secure remote management capabilities to protect industrial networks.
- Compatibility: If you rely on Windows, macOS, or Linux, ensure the vendor provides a consistent management UI or virtual COM port drivers.
- Physical mounting: Din Rail or wall-mount options help integrate devices into industrial enclosures or control panels.
- Future-proofing: Consider devices with modular firmware and upgradable features to adapt to evolving network needs.
These considerations help balance cost, scalability, and ease of management when bridging RS232/RS485 devices to modern IP networks. The highlighted products provide a range of port counts, management interfaces, and network capabilities to align with different industrial and commercial use cases.