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Easily read and write data to Modbus devices over both TCP and serial networks with IOTech’s high-performance Modbus device connector
What is Modbus?
- Modbus is a widely used open communications protocol for delivering data between control systems and devices
- Prevalent in Industrial Automation and Buildings Management
- Modbus was initially developed to reliably transmit control and instrumentation data between devices over serial lines
- A Modbus ‘Master’ device can write data to a Modbus ‘Slave’ device and the Master can also request data from the Slave
- Modbus RTU is used in serial communication and transmits its data frames with a cyclic redundancy check (CRC) checksum to ensure the reliability of the data across the serial lines
- Modbus TCP/IP delivers the Modbus data over Ethernet using TCP/IP frames and therefore does not require the same error checking as Modbus RTU
IOTech's Modbus device connector supports 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
Device ConnectivityIOTech Supported Device TechnologiesUSB Camera Connector