JCOM Automation Inc. offers a full line of Modbus products from 4Next, Helmholz, and Thorsis Technologies:

    • Modbus TCP/RTU Datalogger
    • Modbus TCP to RTU Bridges/Gateway (wired, WiFi, radio)
    • Modbus TCP to HART, PROFIBUS DP, PROFIBUS PA Gateway
    • Modbus software
    • Modbus IO
    • Switches
    • Connectors
    • Training

Modbus TCP/RTU Datalogger

These easy-to-use dataloggers let you monitor up to 384 variables using Modbus RTU Master on RS-485 or Modbus TCP Master. Configuration is done through an intuitive web interface and all data is stored on an SD RAM drive. These logs can then be downloaded via MQTT, FTP, or OPC UA depending on the model. There is also a model that has a built-in 4G modem for remote access. Please contact JCOM Automation Inc. at to discuss what model would be right for your application.

Modbus TCP to Modbus RTU (RS-232 or RS-485) Bridge/Gateway (wired, wifi, radio)

If you are looking for an easy-to-use Bridge/Gateway, then this one is for you. All the setup is done via an intuitive web interface. We offer three models; wired, wireless (wifi), or radio. The applications are endless.


Thorsis Technologies makes an excellent gateway from Modbus TCP to HART, PROFIBUS DP and PROFIBUS PA depending on the module selected. It comes with full DTM support and works well with PACTware. The gateway is DIN rail mountable and completely scalable. Please contact JCOM Automation Inc. at for more information about this great product.

Modbus Software – aMBition

aMBition is a Modbus master by 4Next Technology Systems that runs on a PC and will let you read and visualize Modbus variables.

The free copy will let you read and visualize Modbus variables. Click here to download your free copy.

The Pro version will also let you log the data and view it in graphical format. Please contact JCOM Automation Inc. at for more information and pricing for the Pro license. 

Modbus RTU/TCP IO Modules


If you are looking for cost effective small I/O modules then these modules from 4Next Technology Systems are for you. Each module is a Modbus slave and can connect to a master either via TCP or RS-485. In addition, there is an optional WiFi or 868MHz radio interface available. 

NXT-M2 comes with 2 AI, 4 DI and 2 DO

NXT-A4 comes with 4 AI and 4 AO

NXT-D16 comes with 16 DI and 16 DO

All analog inputs are configurable as either 0-10V, 4-20mA, PT100, PT1000, NTC, PTC, or thermocouples

All analog outputs are configurable as 0-10V or 4-20mA


Modbus TCP I/O Rack – TB20

The TB20 distributed IO system, made by Helmholz, is a high-quality IO system with a wide range of modules that can fit into a wide range of applications. These cost effective modules have a small footprint and are DIN rail mountable.

Modbus RTU/CAN I/O Modules

These are remote I/O devices that can talk back to either a Modbus RTU master via RS-485 or a CANOPEN master via CAN bus.


For most Modbus TCP applications an unmanaged switch works great. Helmholz makes 5, 8, and 16 port versions in both 100Mbps and 1Gbps. They are made with German quality and North American ease of use. The switches have a small footprint, taking up minimal panel space, but with all the functionality you need.


Helmholz makes easy to use industrially hardened RJ-45 connectors for both 100Mbps and 1Gbps Ethernet. They come in 180, 90, and 45 degree angles for either Cat-5e or Cat-6 applications. Please contact us at for more information.

helmolz pn connectors

We have Modbus training!

JCOM Automation Inc. has a great one-day Modbus Maintenance and Troubleshooting course. This course will teach you how Modbus works, the difference between TCP and RTU, and how to troubleshoot both.

Click here for course details or contact us directly at


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Check out our course schedule, or get in touch

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