Heidelberg wb example Modbus Register 259: Remote lock

Technical Definition

The register remote lock at address 259 is used to monitor remote lock on the heidelberg wb example.

• 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 remote_lock (Address: 259)
# Note: Check if your device uses 0-based or 1-based addressing
result = client.read_input_registers(address=259, 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: "remote_lock"
  address: 259
  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[heidelberg_wb_example]

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

💡 Engineer's Insight

Analysis: Enables or disables remote locking functionality. Prevents unintended operations or access. Typically a boolean (0/1).

Troubleshooting: Zero means unlock or disabled. Non-zero means locked. Unexpected state suggests communication issues or a control command failure.