Engineer for a Day: Wireless Modbus Gateway

Engineer for a Day is a new feature for you to provide feedback and suggestions for products that are currently in development at Sealevel. Please provide input for our engineering team by commenting.

Wireless Modbus Gateway

The Basics: The Wireless Modbus Gateway will provide wireless Ethernet Modbus TCP to RS-485 communication to SeaI/O modules.

A Few Planned Features

  • RS-485 interface
  • DIN Rail mounting option
  • Voltage input range
  • Screw terminal power input and RS-485 connections
  • Software-configurable Modbus address, where applicable
  • Best-in-class RS-485 interface transient protection

What would make this product great? Would you want the ability to daisy-chain? Metal, plastic, does it matter? Let us know!


  1. Dave Bailey
    Posted February 28, 2017 at 11:38 am | Permalink

    What about making it sealed for outdoor use?

  2. Katherine Elrod Katherine Elrod
    Posted February 28, 2017 at 2:24 pm | Permalink

    That’s a great idea, Dave. Generally we recommend an IP-rated enclosure or pole-mounted box, depending on your specific application.

  3. Posted April 12, 2017 at 4:38 pm | Permalink

    Probably a big change in scope, but could you also add a USB port? Would be great to be able to add USB to ??? adaptors to interface with other protocols. When is the release date for this? I could use one today…

  4. Andre Swingler
    Posted August 23, 2017 at 10:33 am | Permalink

    I was hoping that Sealevel would make an RS-485 Modbus RTU/TCP Gateway. We already have a number of Sealevel devices and have been pleased with their performance and reliability.

    We’re looking for a Modbus gateway but Wireless is not robust enough for our needs. Will this unit have an ethernet port in addition to the Wireless port?

    Will the device be RTU, ASCII or both?

    Any word on availability?

  5. Katherine Elrod Katherine Elrod
    Posted September 6, 2017 at 11:45 am | Permalink

    Hi, Andre, and thank you for your comments and questions! All Sealevel Modbus devices implement Modbus RTU. All Sealevel SeaI/O Ethernet devices include a Modbus TCP/IP to RTU gateway. Simply connect your Modbus device to the expansion port of the SeaI/O device. Modbus TCP/IP messages are converted by the internal gateway to RTU messages and placed onto an internal RS485 bus that is simultaneously presented at the expansion port of the SeaI/O Ethernet device. The Ethernet SeaI/O device will only act on RTU messages that contain its address allowing other connected devices to act and respond. Responses are returned to the master using Modbus TCP/IP. Hopefully these tips will help you meet your Modbus gateway needs while we continue to develop the new gateway. Thank you!

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