[SOLVED] wrong data received

[yuguifly]

Hello, I'm trying communicating with a PLC with this library but I get a bad data and I don't know what is wrong. the image 1 is PLC configuration, the image 2 first line is the data I want recived, the image 3 is the documentation where this data are and this is the code Im using to comunicate with PLC and the response Im getting. Some one could help me, I'he tried a lot of things but I don't what's the problem. Thank you.

CODE

define MAX485_DE 3

define MAX485_RE_NEG 2

// instantiate ModbusMaster object ModbusMaster node;

void preTransmission() { digitalWrite(MAX485_RE_NEG, 1); digitalWrite(MAX485_DE, 1); }

void postTransmission() { digitalWrite(MAX485_RE_NEG, 0); digitalWrite(MAX485_DE, 0); }

void setup() { pinMode(MAX485_RE_NEG, OUTPUT); pinMode(MAX485_DE, OUTPUT); // Init in receive mode digitalWrite(MAX485_RE_NEG, 0); digitalWrite(MAX485_DE, 0);

Serial.begin(19200,SERIAL_8E1);

// Modbus slave ID 1 node.begin(49, Serial); // Callbacks allow us to configure the RS485 transceiver correctly node.preTransmission(preTransmission); node.postTransmission(postTransmission); } bool state = true;

void loop() { uint8_t result; uint16_t data[6];

// Read 16 registers starting at 0x3100) result = node.readHoldingRegisters(0x511D, 2); Serial.println("---- ENTRADA 1 ----"); if (result == node.ku8MBSuccess) {

data[0]=node.getResponseBuffer(0x00);
Serial.print("Valor de REG1: ");
Serial.println(data[0]);
data[1]=node.getResponseBuffer(0x01);
Serial.print("Valor de REG2: ");
Serial.println(data[1]);

}

delay(1000); }

Response 1Q A---- ENTRADA 1 ---- Valor de REG1q: 52429 Valor de REG2: 16649

[gio-dot]

I see 19200 in the plc serial configuration and 9200 in your code...

[yuguifly]

sorry, I've put wrong in the post, I had 19200 on the test

[yuguifly]

Hello I solved the problem... the plc`s documentation is wrong!!!! I have to read a position less... the register 511D is 511C,

[mridah]

Can you please tell your wiring? I'm trying to use arduino uno with Max485 but all I keep getting is 226

[IoTThinks]

Can you please tell your wiring? I'm trying to use arduino uno with Max485 but all I keep getting is 226

Try to wire TX to TX and RX to RX.

[rudro101]

Can you please tell your wiring? I'm trying to use arduino uno with Max485 but all I keep getting is 226

Did you able to solve the problem?