M5Stack Atom Lite 315Bd0 Rs485 Modbus Register 10: PWP Compressor Running Frequency

Technical Definition

The register PWP Compressor Running Frequency at address 10 is used to monitor pwp compressor running frequency on the M5Stack Atom Lite 315Bd0 Rs485.

• Protocol: Modbus RTU
• Data Type: U WORD
• Unit: Hz
• Access: Read Only

How to Read (Python pymodbus)

Use this code snippet to read this specific value via RS485:

from pymodbus.client.sync import ModbusSerialClient

client = ModbusSerialClient(method='rtu', port='/dev/ttyUSB0', baudrate=9600)
client.connect()

# Read PWP Compressor Running Frequency (Address: 10)
# Note: Check if your device uses 0-based or 1-based addressing
result = client.read_input_registers(address=10, count=2, unit=1)

if not result.isError():
    print(f"Raw Value: {result.registers}")
else:
    print("Error reading register")

client.close()

Integration (Home Assistant)

Paste this into your configuration.yaml:

- platform: modbus_controller
  name: "PWP Compressor Running Frequency"
  address: 10
  value_type: U_WORD
  unit_of_measurement: "Hz"

Connection Diagram

Here is the standard RS485 wiring for this configuration:

graph TD
    PLC[Host Controller / Home Assistant]
    Device[M5Stack Atom Lite 315Bd0 Rs485]

    PLC -- "A+ (D+)" --> Device
    PLC -- "B- (D-)" --> Device
    PLC -- GND --> Device

💡 Engineer's Insight

Analysis: PWP Compressor operating frequency (Hz). Indicates motor speed and load. Higher values mean higher speed.

Troubleshooting: Zero reading may indicate motor stop, VFD fault, or communication issue. Check power, VFD status, and Modbus connection.