rs485.py

gistfile1.py

import serial
import serial.rs485
import time

ser = serial.Serial(
    #For iot Basic afaik is this one, for the advanced should be the USB0
    port='/dev/ttyS2',
    baudrate=9600,
    parity=serial.PARITY_NONE,
    stopbits=serial.STOPBITS_ONE,
    bytesize=serial.EIGHTBITS,
    timeout=1
)

ser.rs485_mode = serial.rs485.RS485Settings(
    rts_level_for_tx=True,   # RTS high during transmission
    rts_level_for_rx=False,  # RTS low during reception
    delay_before_tx=0,
    delay_before_rx=0
)

byte_delay = 10 / 9600  # ~0.00104 seconds
while True:
    ser.write(b'\x54')
    ser.flush()
    time.sleep(byte_delay)