MODBUS Protocol
MODBUS is an industrial communication protocol used to connect sensors, controllers, and data loggers over RS485 serial connections.
What is MODBUS Protocol?
MODBUS is a serial communication protocol widely used in industrial automation and building management systems. Developed in 1979, it has become the de facto standard for connecting electronic devices in industrial environments. MODBUS RTU (Remote Terminal Unit) over RS485 is the most common variant.
In IoT monitoring, MODBUS allows gateways to read data from existing industrial controllers (like Dixell cold room controllers), PLCs, and sensors — converting legacy equipment into cloud-connected monitoring points without replacement.
Why It Matters
Most industrial facilities already have MODBUS-compatible controllers installed. Rather than replacing this expensive equipment, MODBUS-to-cloud gateways provide a cost-effective path to digital transformation — adding real-time monitoring and alerts to existing infrastructure.
Frequently Asked Questions
What is the difference between MODBUS RTU and MODBUS TCP?
MODBUS RTU transmits data over serial connections (RS485) using binary encoding — ideal for industrial environments. MODBUS TCP transmits over Ethernet/IP networks using TCP/IP packets. Both carry the same data; the difference is the physical transport layer.
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