Send an HEX array to a sensor and get an HEX response

[António Brito]

Hello, im working on a project.
I have a esp32 connected to a rs485 and the Modbus connected to a sensor, the main objective is to send an hex array and receive another array via uart with the response. right know I think I can send but get no response.
if I print my uart.write e get FF 03 00 09 00 41 D6 but when I get my response I get <none>
this is my code, thx for helping:

import machine
import time
from machine import Pin

rts = machine.Pin(22, machine.Pin.OUT)
uart = machine.UART(2, 9600)

while True:
    rts.on()
    cmd = b'\xff\x03\x00\t\x00\x01\x41\xd6'
    hex = ' '.join(["%02X" % x for x in cmd])
    uart.write(hex)
    print(hex)
    time.sleep(1)
    rts.off()
    time.sleep(1)
    data = uart.read()
    print (data)