Amber Modbus Register 375: SG increase setpoint domestic hot water

Technical Definition

The register SG increase setpoint domestic hot water at address 375 is used to monitor sg increase setpoint domestic hot water on the Amber.

• 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 SG increase setpoint domestic hot water (Address: 375)
# Note: Check if your device uses 0-based or 1-based addressing
result = client.read_input_registers(address=375, 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: "SG increase setpoint domestic hot water"
  address: 375
  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[Amber]

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

💡 Engineer's Insight

Analysis: Setpoint for increasing solar gain (SG) for domestic hot water preparation.

Troubleshooting: Configuration error or system not actively seeking SG increase for DHW.