TAIL485

[cepics]

hi all,
I'm reading a serial machine data out , on ATOM, with this RS422/TTL YL-128 adaptor
datasheet

with this code

void setup() {

  Serial.begin(115200);
  delay(1000);

//              speed, mode,      rx, tx
  Serial2.begin(9600, SERIAL_8N1, 26, 32);
  delay(1000);

void loop() {
  recvBytesWithStartEndMarkers();
  showNewData();
}

void recvBytesWithStartEndMarkers() {
  static boolean recvInProgress = false;
  static byte ndx = 0;
  byte startMarker = 0x7C; // "|"
  byte endMarker = 0x0A; // (LF) "/n"

  //  byte startMarker = 0x0A; // "/n"
  //  byte endMarker = 0x0D; // (CR) "/r"


  byte rb;

  while (Serial2.available() > 0 && newData == false) {
    rb = Serial2.read();

    if (recvInProgress == true) {
      if (rb != endMarker) {
        receivedBytes[ndx] = rb;
        ndx++;
        if (ndx >= numBytes) {
          ndx = numBytes - 1;
        }
      }
      else {
        receivedBytes[ndx] = '\0'; // terminate the string
        recvInProgress = false;

        numReceived = ndx;  // save the number for use when printing
        ndx = 0;
        newData = true;
      }
    }

    else if (rb == startMarker) {
      recvInProgress = true;
    }
  }
}

void showNewData() {
  if (newData == true) {

    //    Serial.print(" ... HEX Value.. ");
    for (byte n = 0; n < numReceived; n++) {
      Serial.print(receivedBytes[n], HEX);
      Serial.print(' ');

      if (receivedBytes[numReceived - 3] == 0x36 && receivedBytes[numReceived - 6] == 0x30) {
        unit = 0; // CM ARRI 60
      }

      if (receivedBytes[numReceived - 3] == 0x37 && receivedBytes[numReceived - 6] == 0x30) {
        unit = 1; //FT ARRI 70
      }

      if (unit == 0 && receivedBytes[numReceived - 6] == 0x31) {
        cm = receivedBytes[numReceived - 4] * 100 + receivedBytes[numReceived - 3] * 10 + receivedBytes[numReceived - 2];

      }
      if (unit == 1 && receivedBytes[numReceived - 6] == 0x31) {
        ft = receivedBytes[numReceived - 5] * 10 + receivedBytes[numReceived - 4];
        inc = receivedBytes[numReceived - 3] * 10 + receivedBytes[numReceived - 2];

      }
    }
    Serial.println();
    Serial.print ("cm ");
    Serial.println (cm);
    Serial.print ("ft ");
    Serial.println (ft);
    Serial.print ("inc ");
    Serial.println (inc);

    newData = false;

  }
}

and this connections:

machine----------------------------- RS422/TTL
grd ------------------------------------ A ............. Y-----NC
sgl ------------------------------------- B ............. Z----NC
12V ----- +12v

RS422/TTL ---------- ATOM
TX ---------------------- RX
RX -----------------------TX
5V ---------------------- 5V
GRD -------------------- GRD

the newbie question is:

can I use instead RS485 module based on SP485EEN-L ??

tnks a lot

[cepics]

nobody?

[m5stack]

The RS422 module you are using is not compatible with our RS485

[Johnny241]

@m5stack Hello!

I would like to know to which bronchi pins A and B of the RS485 extension card are connected to the BUS, please.

I can't get my M5 to communicate via RS485, however I soldered the small expansion card well.
For my program I am using an ESP32 based Arduino library for the Modbus RTU