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

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