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This video explains how to read and write registers with a Modbus RS485 device:
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What is a Modbus thermostat?
The “Smart Modbus RS485 Thermostat” is an advanced and innovative device designed to provide efficient temperature control and management in various settings. This thermostat utilizes the Modbus RS485 communication protocol, allowing seamless integration with other compatible devices and systems.
Smart Modbus RS485 Thermostat - Smart home solutions
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How to use Modbus RS485?
0:47
2:28
Over a single cable for data transmission. Simply put Modbus is the language and RS485 is theMoreOver a single cable for data transmission. Simply put Modbus is the language and RS485 is the channel modbus transmits data over RS485. Just like you would make a phone call over a phone line.
Beginner's Guide To Modbus RS485 Protocol | How They Work - YouTube
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