Client Overview
Client mode turns Modbux into a Modbus client (master). You use it to connect to an existing device (a PLC, sensor, variable frequency drive or any other Modbus device) and read or write its registers.
What can you do?
Connect
Connect via TCP (network) or RTU (serial). Configure address, port and Unit ID and you're online.
Read and write
Read register values, write new values, or poll continuously to monitor live data. Choose the data type (including bitmap) and apply scaling.
Scan and discover
Don't know which Unit IDs or registers a device has? Scan them automatically to map out your device.
The flow
A typical session in Client mode goes like this:
Connect: Choose TCP or RTU, fill in the connection details and click Connect.
Configure registers: Select the register type, start address and length. Click Read to fetch the data.
Analyze data: Turn on Advanced Mode (cog icon) to see all data type interpretations at once. Once you know the types, add scaling or comments.
Write (optional): Modify values and write them back to the device via the write button on the relevant row.
Save configuration (optional): Save your register setup so you can load it instantly next time.
Understanding Modbus
Learn Modbus fundamentals. Register types, function codes, data addressing, big-endian vs little-endian byte order, and TCP vs RTU differences.
Connection
Set up a Modbus TCP or RTU connection in Modbux. IP address, port, serial settings, Unit ID configuration and troubleshooting tips.