Modbus TCP Client Source Code Stack

The Fastest Way to Modbus TCP-Enable Your Factory Floor Product

The Modbus TCP Client Source Code Stack development kits allow you to add Modbus communications easily and quickly add to your product. Developed specifically for embedded platforms, it has no RTOS requirements. These development kits were written in-house and have been deployed in hundreds of unique devices over the last 30 years. This is a market test solution supported by an industry leading provider.


  • 100% C-based source code
  • No nonsense, single product line licensing with no ongoing royalties
  • Easily extensible, table-driven object model structure
  • Easy-to-use single task implementation
  • Ready-to-run, sample application that can be immediately compiled, downloaded and executed
  • 30-day, no risk guarantee

Modbus TCP Client Source Code Stack



What is Modbus TCP?

Modbus TCP is an Ethernet implementation of the widely supported, widely used Modbus RTU protocol. Modbus RTU is the easy-to-implement client/server communications protocol built by Modicon in the late 1970s. Modbus RTU achieved incredible penetration to many markets and applications because of its sheer simplicity. With a very small command set, easy to understand network representation and simple request/response message structure, it became the defacto leader for communications between industrial devices. The biggest advantage for vendors implementing Modbus RTU is that it required no additional hardware other than a serial channel and a RS-485 driver chip. Adding Modbus RTU could be accomplished with little expense but end users suffered with very low throughput, troubleshooting and sometimes non-standard driver chip implementations. Modbus TCP corrects those problems.


Building on the simplicity of Modbus RTU and the desire for many customers to use Ethernet, Modbus TCP was created. Modbus TCP uses the identical command set, addressing modes and network representation as Modbus RTU. Effectively the same message that is transferred over RS-485 using Modbus RTU is sent over a TCP/IP connection using Modbus TCP. Only the error checking bytes are eliminated as they are provided at the physical Ethernet layer. Using the identical message structure and network representation enabled many users to move their RTU applications to Ethernet.

You can now add Modbus TCP client communications to your product quickly and easily with the Modbus TCP Client Source Code Stack development kits from Real Time Automation, Inc. Developed specifically for industrial platforms and fully integrated with any number of RTOS systems and TCP/IP stacks, you can have Modbus TCP client communications in days not weeks, months or years. The development kit includes everything you need to implement your Modbus TCP networking solution: royalty-free, single task source code, sample objects, PC Tools, a ready-to-run sample application, complete documentation and so much more.

What to Do Next

Your next step is to contact us via email, phone or by completing the Request Software Information Form so we can schedule some time to discuss your application.

What our Customers are Saying

“When it came to getting the job done, we turned to Real Time Automation, and they performed. RTA helped us figure out a complex communications interface problem in short order, and provided hardware and software modification requirements for implementation before we even got off the plane!”

Kevin L. / HTS Engineering Ltd.

“We have worked with Real Time Automation on a variety of projects over the past few years. I have consistently found them enthusiastic to work with us throughout the development process to ensure that we receive a communications solution that meets our needs. More importantly, their commitment to providing timely support services after the initial release of the system is truly exemplary.”

Ken F. / Danfoss Graham