I cant receive data from BQ76PL455

Projects Networking, Protocols, and Devices
8

I Did it all, I´m conected as I said, and i have GND of the BQ to my arduino. The voltage is 5V.
My principal problem is to communicate the port 3 with the port 0 and have a response.

In my 1st test i had this code.

  // read from port 3, send to port 0:
  if (Serial3.available()) {
    int inByte = Serial3.read();
    Serial.write(inByte);

With this code i receive a strange message. Only 1 word, but i received something, i think....