server_memory_areas

Example of the component plasmapper/pl_modbus v1.2.1

Modbus Server Memory Areas Example

  1. UART Modbus server is created with UART0 as a port, Modbus RTU protocol and station address 1.
  2. UART0 is initialized.
  3. UART0 parameters are set to 115200 bps, 8 data bits, even parity, 1 stop bit and no flow control.
  4. UART0 is enabled.
  5. Serveral memory areas are added to the server (and in-program locked data access is shown):
    • 5 holding registers (addresses 0..4).
    • 5 holding registers (addresses 5..9) with typed access (addresses 0..4).
    • 5 holding and 5 input registers (addresses 10..14) mapped to the same memory area with typed access.
    • 5 holding registers (addresses 15..19) with first register LSB accessible as coils (addresses 15..22) with typed access.
    • Dynamic input register (address 20) that contains the uptime value in seconds.
  6. UART Modbus server is enabled.

To create a project from this example, run:

idf.py create-project-from-example "plasmapper/pl_modbus=1.2.1:server_memory_areas"

or download archive (~2.41 KB)