Modbus Device Connector

Easily read and write to data Modbus devices over both TCP and serial networks with IOTech’s high performance Modbus device connector

Protocol Description

Modbus is a widely used open communications protocol that delivers data between control systems and devices. Modbus has a long history and is still one of the most prevalent protocols used in OT systems - particularly in Industrial Automation and Building Management.

Modbus is master/slave protocol and uses a set of fixed commands to communicate. The Modbus master device can write data to a Modbus slave device and optionally request a response from the slave. Modbus data is stored using single-bit coils and discrete input types, as well as 16-bit input registers and holding registers for more detailed information.

The most common versions of Modbus are Modbus RTU and Modbus TCP. Modbus RTU runs over serial lines and uses cyclic redundant checking to ensure reliability, while Modbus TCP delivers the Modbus commands and data using TCP/IP frames over TCP networks.

Modbus Connector Specification

IOTech’s Modbus device connector support both Modbus RTU and Modbus TCP variants and wide variety of functionality including performance gains from batch reading or writing data where possible.

The Modbus device connector implements the following key features:

• Support for both Modbus RTU and Modbus TCP devices

• Read operations for input statuses, coils, input registers and holding registers

• Write operations for coils and holding registers

• Batch (multi) read operations for input statuses, coils, input registers and holding registers

• Batch (multi) write operations for coils and holding registers

• Support for Boolean, Int8, Uint8, Int16, Uint16, Int32, Uint32, Int64, Uint64, Float32, Float64 and String data types

• Support for byte and word swapping for Int32, Uint32, Int64, Uint64, Float32, and Float64 data types which is required for communication with some Modbus devices

• Support for reading individual Boolean bits from input registers and holding registers

• Support for writing individual Boolean bits to holding registers

• Support for the base address mechanism required for communication with some Modbus devices

How to Buy

Modbus Device Connector is available to buy from our store. To connect your IoT endpoint (device/sensor/thing) to a Modbus enabled device, follow the steps below; 

1. Go to our marketplace or click the "Buy Now" button below.  

2. Choose the edge software platform you would like to run this on (Edge Xpert, Edge XRT, EdgeX) and start building the specifications based on your requirements.

3. Once your cart is complete, submit the order and proceed to checkout. You will be required to register or log in to your existing account.

4. Once you have filled in your Company Information, select your preferred payment method. You can pay via Credit Card or a Purchase Order. You will need to request a quote for Purchase Orders.

   • For Credit Card payments,

     1. Submit billing information and proceed to payment.

   • For Purchase Orders,

     1. Submit a request for a quote by clicking the "Request a Quote" button and wait for IOTech to approve. Once it's approved, you will receive an email with the approved quote attached.

     2. Sign the approved quote and log back in to your account. On your "Quotes" tab, select the approved quote and click "Order Now". 

     3. Go to your cart. Any item on your cart will be cleared and replaced with the items on your approved quote. Click "Proceed to Checkout"

     4. Supply your company information and select payment method. You can either pay via Credit Card or Submit a P.O.
     5. If you choose to pay via Credit Card, fill the billing information and proceed to payment.
     6. If you choose to pay by PO, enter the PO number (optional), attach the signed quotation and the Purchase Order (optional).
     7. Review the order and Submit.

Click the Buy Now button below or Contact Us if you need assistance.

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