Need Help - one_inverter_rs485_modbus

[alvzbeat]

-- coding: utf-8 --

import os
from datetime import datetime
from time import sleep
import pandas as pd
import minimalmodbus

SERIAL_PORT = '/dev/ttyUSB0'

BASE_FOLDERPATH = os.path.dirname(os.path.abspath(file))
DATA_FOLDERPATH = os.path.join(BASE_FOLDERPATH, 'data')

Function to read input registers

def read_input_registers(instrument, start_address, count):
try:
# Read input registers. Registers are 16 bits.
registers = instrument.read_registers(start_address, count, 4) # Function code 4
return registers
except minimalmodbus.NoResponseError as e:
print(f"No response from device: {e}")
except minimalmodbus.ModbusException as e:
print(f"Modbus error: {e}")
except Exception as e:
print(f"Error: {e}")

Configure the serial connection

instrument = minimalmodbus.Instrument(SERIAL_PORT, 1) # Port name, Slave address (in decimal)
instrument.serial.baudrate = 9600 # Baud
instrument.serial.bytesize = 8
instrument.serial.parity = minimalmodbus.serial.PARITY_NONE
instrument.serial.stopbits = 1
instrument.serial.timeout = 1 # seconds

while True:
filepath = os.path.join(DATA_FOLDERPATH, f'results_{datetime.now().date()}.csv')
result = read_input_registers(instrument, 0, 27)
if result is not None:
result.append(datetime.now().timestamp())
df = pd.DataFrame([result])
df.to_csv(filepath, mode='a', index=False, header=not os.path.exists(filepath))
sleep(3)