Plenty of factories still run on RS-232, RS-422 and RS-485 equipment. PLCs, barcode scanners, weighing scales and meters often work perfectly well, but they can’t talk to a modern network on their own. That’s where these devices come in. Their names overlap, so people often buy the wrong one. Here’s how to tell them apart and pick the one that suits your setup.
What Is a Serial Device Server?
A serial device server gives a serial device its own IP address on your network. It has a small built-in processor, its own settings page and several ways to send data.
Most units let you choose how they work:
- Virtual COM mode: Software on a PC sees the remote device as a local COM port.
- TCP server or client mode: The device sends and receives data over a direct network link.
- UDP mode: Data goes out to several hosts at once.
Many models also offer multiple ports, password protection and remote monitoring. That makes a serial device server a good fit for plants with lots of machines spread across a site.
What Does a Serial to Ethernet Converter Do?
A serial to Ethernet converter does one main job. It takes serial data, wraps it in Ethernet packets and sends it across the network, and does the same in reverse.
Simpler models need little setup. You assign an IP address, match the baud rate and connect. They usually have one or two ports and fewer management features.
Many vendors use both names for the same product, so always check the spec sheet rather than the label. Look at the operating modes, port count and management options before you order.
Serial Device Server vs Serial to Ethernet Converter: Key Differences
| Feature | Serial device server | Basic converter |
| Operating modes | Several | One or two |
| Ports | Often multiple | Usually one or two |
| Management | Web page, remote monitoring | Basic setup |
| Best for | Larger sites, many devices | Single device links |
In short, a serial device server suits growing networks where you need control and visibility. A basic converter suits fixed, one-to-one links that rarely change.
Where a USB to Serial Converter Fits
A USB to serial converter solves a different problem. It doesn’t use your network at all. It plugs into a laptop or PC and adds an RS-232, RS-422 or RS-485 port.
Engineers often carry one to configure PLCs, test equipment or update firmware on site. Point-of-sale systems, banking terminals and lab instruments use them too. If your device sits right next to a computer, a USB to serial converter is often all you need.
How to Choose the Right Device
Ask yourself a few simple questions:
- How far away is the device? If it’s next to a PC, use a USB to serial converter. If it’s across the plant, go networked.
- How many devices do you have? One machine suits a simple serial to Ethernet converter. A row of machines suits a multi-port serial device server.
- Does your software need a COM port? Pick a unit with virtual COM support.
- What’s the environment like? Look for DIN-rail mounting and isolation on noisy factory floors.
- Do you need wireless? Some device servers offer Wi-Fi or cellular links for remote sites.
Conclusion
A serial device server gives you more control, more ports and more ways to connect. A basic serial to Ethernet converter keeps things simple for single links. A USB converter handles quick local connections.
Not sure which one suits your setup? Browse the serial communication range at Global Infotech Solutions, or get in touch for help choosing.
Frequently Asked Questions
Is a serial device server the same as a serial to Ethernet converter?
Not always. Many vendors use both names for similar products. A serial device server usually offers more modes, ports and management features, while a basic serial to Ethernet converter focuses on a simple serial-to-network link. Check the spec sheet before buying.
Which serial standards do these devices support?
Most support RS-232, and many also handle RS-422 and RS-485. Some models let you switch between them using a setting or a jumper. Check that the unit matches your equipment’s standard, pin layout and wiring before you install it.
Can I use a USB to serial converter over a network?
No. A USB to serial converter connects a device directly to a nearby computer through its USB port. It suits on-site configuration and testing. For remote access over a LAN, you need a networked device server or converter instead, connected to your LAN.
What is virtual COM mode?
Virtual COM mode lets older software treat a networked serial device as if it were plugged straight into the computer. You install a driver, map a COM port, and the software keeps working as before without any code changes.
Do I need an isolated converter for factory use?
Isolation helps a lot in factories. Electrical noise, ground loops and voltage spikes can damage ports or corrupt data. An isolated unit protects both the converter and your connected equipment, which saves money on repairs and unplanned downtime later.