I am using the following code to get the wind direction from a wind vane via a RS845 using the following code

import minimalmodbus

instrument = minimalmodbus.Instrument('/dev/ttyACM0', 2) # Address 2 for your sensor

# Set the communication parameters (you may need to adjust these)
instrument.serial.baudrate = 9600
instrument.serial.timeout = 1 # Set the timeout value as needed

try:
# Read wind direction data (replace 1 with the register address for wind direction)
wind_direction = instrument.read_register(1, functioncode=3)
print(f"Wind Direction: {wind_direction} degrees")

except Exception as e:
print(f"Error reading sensor data: {e}")

finally:
instrument.serial.close()

I get the following error and have no idea how to proceed

Error reading sensor data: Too short Modbus RTU response (minimum length 4 bytes). Response: b'\x00'

A point in the right direction would be helpful.