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Description
B+B SmartWorx 2 Port Ethernet Serial Server, DIN, Wide TemperatureThe ESR900 Series Industrial Ethernet Serial Server is engineered to bridge modern Ethernet networks with legacy serial devices in demanding environments. This 2 port model provides reliable, long term connectivity for PLCs, sensors, controllers, and serial peripherals across factory floors, control cabinets, and industrial facilities. Built for harsh settings, it combines a slim DIN rail friendly enclosure, IP30 protection, and a broad operating
The ESR900 Series Industrial Ethernet Serial Server is engineered to bridge modern Ethernet networks with legacy serial devices in demanding environments. This 2-port model provides reliable, long-term connectivity for PLCs, sensors, controllers, and serial peripherals across factory floors, control cabinets, and industrial facilities. Built for harsh settings, it combines a slim DIN-rail friendly enclosure, IP30 protection, and a broad operating temperature range to ensure stable operation even in the most challenging environments. Whether you need RS-232 or RS-485 interfaces, the ESR900 simplifies integration, reduces wiring complexity, and enhances data visibility across your automation infrastructure.
- 2-port Ethernet Serial Server — Industrial-grade Ethernet to RS-232 and RS-485 conversion with two serial ports, designed to connect Ethernet networks to legacy serial devices with reliability and ease.
- DIN rail mountable, thin-profile enclosure — A compact, space-efficient design that fits neatly into standard control panels and on DIN rails for streamlined industrial deployment.
- Industrial-grade protection — IP30-rated housing offers protection against dust and debris in rugged environments, ensuring long-term durability in manufacturing floors and harsh enclosures.
- Wide temperature operation — Built to handle challenging temperature ranges found in industrial settings, outdoor kiosks, and refrigerated or heated facilities, ensuring consistent performance year-round.
- Redundant power supply support — An option for redundant power keeps critical serial communications online, minimizing downtime in automation, SCADA, and process control applications.
Technical Details of ESR900 Series
- Product family: ESR900 Series Industrial Ethernet Serial Server (One, Two or Four Ports)
- Serial interfaces: Ethernet to RS-232 and RS-485 converters with two serial ports on this model
- Mounting: Thin-profile DIN rail mountable enclosure for convenient panel installation
- Protection: IP30 rating for dust protection and rugged durability in industrial environments
- Operating conditions: Wide temperature range suitable for cold rooms and hot environments
- Power: Redundant power supply option to maximize uptime
- Applications: Ideal for industrial automation, SCADA, PLC networks, and device network bridging
how to install B+B SmartWorx ESR900 2-Port Ethernet Serial Server
- Mount the ESR900 on a standard DIN rail inside your control cabinet or equipment enclosure to leverage its compact, DIN-friendly design.
- Connect the Ethernet network to the ESR900 and wire the two serial devices to the RS-232/RS-485 ports as required by your application (one device per port or configured topologies).
- Provide power to the unit, using the redundant power supply option if available, to ensure continued operation in the event of a primary power fault.
- Power up the device and perform a basic connectivity check to confirm the Ethernet link and serial paths are established with your devices or network management system.
- Configure network and serial parameters as needed to align with your existing protocols and device settings, and integrate with your SCADA or PLC system for seamless data exchange.
Frequently asked questions
- Q: What is ESR900? A: ESR900 is B+B SmartWorx's industrial Ethernet Serial Server family, available in One, Two, or Four port configurations, designed to convert Ethernet traffic to RS-232 or RS-485 serial communications in harsh environments.
- Q: How many ports does this model have? A: This specific model provides 2 serial ports on the ESR900 series, enabling two concurrent serial connections over Ethernet.
- Q: Is the enclosure DIN rail mounted? A: Yes—the ESR900 is designed with a thin-profile DIN mount case for easy installation in standard control panels.
- Q: What is the IP rating? A: The ESR900 enclosure carries an IP30 rating, protecting internal components from dust and debris while deployed in industrial settings.
- Q: Can it operate in wide temperature environments? A: Yes—the ESR900 series is built for wide temperature ranges, allowing operation in temperatures typical of industrial facilities and outdoor installations.
- Q: Does it support redundant power? A: Yes, a redundant power supply option is available to maximize uptime in critical applications.
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.7 ★★★★★
Based on 413 reviews
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Product Reviews
★★★★★ 4
Works and Mounts Nicely
Style: Data/Line Protection - 12 ft
I wanted to get one of these so I could use it to plug in all of my electronics that I use in my office desk (pretty typical). The desk is in the middle of the room though, so it made it all that much more important that I could "hide" this inside of the desk.
It was a little difficult to figure out where to put the screws so they correctly lined up with the holes in the back of the device, but after a couple of tries, got it to work. It does occassionally fall down. It would be really nice if there were additional holes in the back of the item so you could put 4+ screws into the surge protector so it has the ability to hold up all of the heavy plug in's that are on the market today.
The cord being 12' long was GREAT! This was really the reason that I purchased this model. It eliminates the need to plug this item into an extension cord, which was key.
It's been a good item. Nothing special, but how special can surge protectors get? The 12' cord is great, the item is sturdy and I have been very happy.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on September 21, 2012
★★★★★ 5
Great surge protector
Style: Standard - 7 ft
Reliable product
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on December 3, 2025
★★★★★ 5
Really nice product from an equally nice company.
Style: Data/Line Protection - 6 ft
Really nice product from an equally nice company.
Note: I do not have PRIME since Amazon.com does NOT stand behind their BS mark-up service and have become WORSE since they started pushing it so much at delivering non PRIME items.
My experience with Belkin has always been Way Over the Top good. So I recommend any product in general. Their customer service namely and their delivery, packaging is STELLAR.
This product is good in that it is robust, the white does not easily scratch (matte type), and the product seems to be well designed overall. The LED's are not obnoxious at all. The wire is thick, robust, but has enough travel to be useful.
Only small enhancement would be to put the switch up top instead of at the end of the power strip to provide more options. And maybe add a USB port.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 19, 2018
★★★★★ 5
Works Well And Nicely Designed.......... See Photos~
Style: Data/Line Protection - 12 ft, Style: Data/Line Protection - 12 ft
Delivered as pictured and described. I was a bit concerned because of the super low price, thinking maybe it was a discontinued model due to problems but we've had good experiences with Belkin products so I went with this one...
When facing it plugged into the outlet, the cord does lean right as advertised. Length is also correct. True white, not an almond color, so it looks nice with white outlet and carpet where visible.
The switch is effectively placed on the end where the cord comes out so it's harder to accidentally switch off. Also it lights up on top to indicate green for protected or red for not grounded.
Also designed for a phone line on the opposite end but we haven't had use for that where we are using this surge protector. Will update this review should we utilize that feature or have any issues.
Smart design at a great price. Uploading photos so you can get a closer look. Smile. Hope this is helpful!
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Reviewed in the United States on August 22, 2015
★★★★★ 5
Must use
Style: Data/Line Protection - 6 ft, Style: Data/Line Protection - 6 ft
I love Belkin products especially when power outages happen.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 7, 2026
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