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[OFFICIAL POST] EEDIY Team (official)
Modbus is a simple way for devices (meters, drives, controllers) to share numbers.
- One master asks, and slaves answer. Each slave has an address from 1 to 247.
- It usually runs over RS-485 wires (two-wire is most common).
- Common requests (“function codes”): 03 = read holding registers, 06 = write one register.
Common mistake: baud rate, parity or stop bits differ between the two devices. They must match exactly.
Sources:
- Modbus Application Protocol Specification (PDF): https://www.modbus.org/file/secure/modbusprotocolspecification.pdf
- Modbus over Serial Line Specification (PDF): https://www.modbus.org/file/secure/modbusoverserial.pdf
EEDIY Team (official)
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