Modbus Esp8266 Modbus Register 136: T1S curve calculated value zone1

Technical Definition

The register T1S curve calculated value zone1 at address 136 is used to monitor t1s curve calculated value zone1 on the Modbus Esp8266.

• Protocol: Modbus RTU
• Data Type: S WORD
• Unit: °C
• 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 T1S_curve_calculated_value_zone1 (Address: 136)
# Note: Check if your device uses 0-based or 1-based addressing
result = client.read_input_registers(address=136, 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: "T1S_curve_calculated_value_zone1"
  address: 136
  value_type: S_WORD
  unit_of_measurement: "°C"

Connection Diagram

Here is the standard RS485 wiring for this configuration:

graph TD
    PLC[Host Controller / Home Assistant]
    Device[Modbus Esp8266]

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

💡 Engineer's Insight

Analysis: Calculated value for Zone 1 of a T1S curve. Unit: Varies based on T1S curve definition. Likely a Temperature or capacity setpoint.

Troubleshooting: Zero value could mean no heating demand in Zone 1, sensor malfunction, or incorrect configuration of the T1S curve logic.