The best serial-to-fiber optic converter depends on your serial protocol, fiber type, connector, and required link distance. The UOTEK model is suited to buyers needing single-mode reach up to 20 km; SERIALCOMM is a plug-and-play multimode option for links up to 2 km; and the industrial single-mode model supports bidirectional serial channels and a wide DC input range. The MOXA and 10Gtek options offer distinct port or network-layout features.
| Product | Best For | Fiber Details |
|---|---|---|
| UOTEK UT-277SM-ST | Long single-mode links | Single-mode, up to 20 km |
| SERIALCOMM SER-Fiber-MM-SC | Simple multimode installations | Multimode, up to 2 km |
| Industrial 20 km converter | Multiple bidirectional channels | Single-mode, 20 km |
| MOXA TCF-142-M-ST | Wide baud-rate requirements | Multimode; ST connectors |
| 10Gtek serial converter | Daisy-chain or redundant-ring layouts | Single-mode, SC, 20 km |
UOTEK UT-277SM-ST Serial Fiber Converter
This converter supports asynchronous RS-232, RS-422, and RS-485 communication and single-mode fiber links up to 20 km. The listed applications include connecting a remote terminal unit to a host computer or a distributed data acquisition system to a SCADA controller.
Best for: Industrial or monitoring systems that need to carry one of the listed serial protocols over a long single-mode fiber link. It was selected for its stated 20 km distance and three-protocol support.
Check before buying: The listing identifies an ST model, so confirm that the fiber connector and single-mode fiber match the equipment at both ends.
SERIALCOMM Multimode SC Converter
The SERIALCOMM unit carries RS-232, RS-422, or RS-485 over multimode fiber for distances up to 2 km. Its listing describes plug-and-play operation, automatic data direction control, and surge and ESD protection. The stated data-rate range is 300–128Kbps.
Best for: Buyers setting up a shorter multimode link who want a converter described as requiring no drivers or setup. The listed industrial uses include automation, security systems, utilities, and building control.
Check before buying: Its stated maximum distance is 2 km, so choose another option if the fiber run exceeds that limit. Confirm the SC connector and multimode fiber type match your link.
Industrial 20 km Bidirectional Converter
This industrial converter is described as having one RS-232 channel, one RS-485 channel, and two high-speed RS-485 channels, all bidirectional. The listing says serial data is transparent and baud rate is self-adaptive, with no setting required. Its single-mode link is specified for 20 km at 1310 nm, and its DC input range is 12–48 V.
Best for: Systems needing multiple bidirectional serial channels or a broad DC supply range. The listing also says its two high-speed RS-485 channels can be grouped into one high-speed RS-422 channel for DMX512 stage-lighting control.
Check before buying: Confirm the channel arrangement and power supply requirements suit the installation; the listing specifies a 12–48 V DC input.
MOXA TCF-142-M-ST Multimode Converter
The MOXA TCF-142-M-ST supports RS-232, RS-422, and RS-485, with a listed baud-rate range of 50 bps to 921.6 kbps. It has two ports and multimode fiber with ST connectors. The listing also notes support for non-standard baud rates.
Best for: Buyers whose serial equipment needs a baud rate within the stated range, including a non-standard rate, and whose fiber setup uses multimode cable with ST connectors. Its stated protocol range makes it a flexible choice across common serial standards.
Check before buying: The provided product details do not state the maximum fiber distance. Verify the supported reach for your specific installation before choosing it for a long link.
10Gtek Single-Mode Serial Converter
This converter uses single-mode fiber, a single SC connector, 1310 nm, and a listed fiber reach of 20 km. Its seven-pin terminal supports RS-485, RS-422, and RS-232 wiring. The product description identifies daisy-chain or redundant-ring fiber layouts and a 155M fiber rate.
Best for: Buyers who need the listed network-layout options and a terminal connection for serial wiring. It was selected for its clearly stated single-mode fiber specifications and support for all three serial standards.
Check before buying: The listing gives copper-side distances of up to 15 m for RS-232 and up to 1.2 km for RS-485/422 at 120 Kbps. Make sure the serial-side run fits those limits.
Buying Guide: How To Choose A Serial-To-Fiber Converter
Which serial protocol does your equipment use?
Match the converter to the equipment’s interface: RS-232, RS-422, RS-485, or a combination. Support for several standards does not by itself confirm that every port can use every protocol at the same time. Check channel details and terminal wiring before ordering.
Do you need single-mode or multimode fiber?
Choose the fiber type already installed or planned for the link. The products listed here include single-mode models with stated reaches up to 20 km and multimode models, including one rated for up to 2 km. Do not assume that fiber types or connectors are interchangeable.
Which connector and distance should you verify?
Compare the converter’s connector with the fiber ends in your system. These options include ST and SC connectors. Also check the specified link distance, wavelength where provided, and any copper-side serial distance limits. A fiber reach specification does not replace checking the serial cable run.
What installation features matter?
For a straightforward installation, look for a stated plug-and-play design or self-adaptive baud rate. For industrial setups, check listed surge or ESD protection, power input range, number of channels, and whether the device supports the required network layout. Confirm these details against the equipment and site requirements.
Frequently Asked Questions
What does a serial-to-fiber converter do?
It carries serial communication, such as RS-232, RS-422, or RS-485, over a fiber-optic link. The supported protocols and fiber specifications vary by model.
Can one converter support RS-232, RS-422, and RS-485?
Some listed models support all three standards. Check the product’s port and channel details to confirm how the interfaces are provided.
How far can a serial-to-fiber link reach?
Reach depends on the converter and fiber type. The products here list limits ranging from up to 2 km for one multimode option to up to 20 km for several single-mode options.
Does the fiber connector type matter?
Yes. Match the converter’s connector, such as SC or ST, to the fiber connection used in the installation.
Is plug-and-play operation universal?
No. Plug-and-play behavior is stated for some models, while other listings describe different setup features. Check the specific product details before assuming no configuration is needed.