Esphome Configuration Example Modbus Register 1308: Device State: 0 = Wait 1 = Normal 2 = Fault 4 = Checking

Technical Definition

The register Device State: 0 = Wait 1 = Normal 2 = Fault 4 = Checking at address 1308 is used to monitor device state: 0 = wait 1 = normal 2 = fault 4 = checking on the Esphome Configuration Example.

• Protocol: Modbus RTU
• Data Type: S 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 Device State: 0 = Wait 1 = Normal 2 = Fault 4 = Checking (Address: 1308)
# Note: Check if your device uses 0-based or 1-based addressing
result = client.read_input_registers(address=1308, 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: "Device State: 0 = Wait 1 = Normal 2 = Fault 4 = Checking"
  address: 1308
  value_type: S_WORD
  unit_of_measurement: ""

Connection Diagram

Here is the standard RS485 wiring for this configuration:

graph TD
    PLC[Host Controller / Home Assistant]
    Device[Esphome Configuration Example]

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

💡 Engineer's Insight

Analysis: Indicates the operational status of a device or process. Values represent states like Wait, Normal, Fault, or Checking.

Troubleshooting: A 'Fault' status (2) requires immediate investigation. 'Wait' or 'Checking' states may indicate normal startup or communication issues.