Hamoduleuarttors485 Modbus Register 0: Friendly name CWT-TH04S-Hum

Technical Definition

The register friendly name CWT-TH04S-Hum at address 0 is used to monitor friendly name cwt-th04s-hum on the hamoduleuarttors485.

• Protocol: Modbus RTU
• Data Type: U WORD
• Unit: %
• 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 friendly_name CWT-TH04S-Hum (Address: 0)
# Note: Check if your device uses 0-based or 1-based addressing
result = client.read_input_registers(address=0, 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: "friendly_name CWT-TH04S-Hum"
  address: 0
  value_type: U_WORD
  unit_of_measurement: "%"

Connection Diagram

Here is the standard RS485 wiring for this configuration:

graph TD
    PLC[Host Controller / Home Assistant]
    Device[hamoduleuarttors485]

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

💡 Engineer's Insight

Analysis: Humidity Sensor Reading (%). Measures the relative humidity in the environment.

Troubleshooting: Zero could indicate sensor fault, no power, or communication error. Check sensor connection, power supply, and device status.