Esp32 Srne Asf Example Modbus Register 61503: Bypass Time

Technical Definition

The register Bypass Time at address 61503 is used to monitor bypass time on the Esp32 Srne Asf Example.

• Protocol: Modbus RTU
• Data Type: U WORD
• Unit: min
• 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 Bypass Time (Address: 61503)
# Note: Check if your device uses 0-based or 1-based addressing
result = client.read_input_registers(address=61503, 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: "Bypass Time"
  address: 61503
  value_type: U_WORD
  unit_of_measurement: "min"

Connection Diagram

Here is the standard RS485 wiring for this configuration:

graph TD
    PLC[Host Controller / Home Assistant]
    Device[Esp32 Srne Asf Example]

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

💡 Engineer's Insight

Analysis: Indicates the duration (likely in minutes or hours) the system has been operating in bypass mode.

Troubleshooting: Zero if not in bypass. A persistent non-zero value indicates a potential issue requiring investigation of the bypass circuit.