Arduino connect hmi and instrument by RS-232

Projects Programming
1

Hello
Fisrt,I aplogize about my bad English.
Now I am working to make a automatic system by arduino .
I am already finish to connect HMI(DELTA 107-CV) and the analyze instrument by TTL to RS232 module(max3232),also I can successfully control external hardware to achieve automation by the relay module.
But there is two big promblem .
First,when I connect HMI, my arduino will send some garbled(see in serial port) to the HMI,how can I stop it.(I'm wondering if hmi needs to send something back to the arduino).
Second,I can send command to the instrument ,but I can not get the result send back to arduino.

Thank you all

THIS IS My CODE

#include <SoftwareReset.h>
#include <ModbusRtu.h>
#include <SoftwareSerial.h>///RS-232
/////////////////////////////////////////////////////////////////////////////////////HMI SETTING///////////////////////////////////////////////////////////
Modbus master(2,8,0);
modbus_t telegram;
uint16_t RW[16] ={
  11,22,33,44,55,66,77,88,0,0,0,0,0,0,1,-1
};
uint8_t u8state;       //!< machine state
uint8_t u8query;       //!< pointer to message query
unsigned long u32wait;
///////////////////////////////////////////////////////////////////////////////////INSTRUMENT SETTING///////////////////////////////////////////////////////////////////////////////////////////////
SoftwareSerial mySerial(6,7); ////////instrument pin
const byte STX = 0x02;   //////////////instrument command           
const byte ETX = 0x03;   //////////////instrument command            
Modbus slave(0, mySerial);
int data;
int i; 
int sum = 0;
int w;
void setup()
{
////////////////////////////////////////////////////////////////RS-232///////////////////////////////////////////////////////////////////////////////////////////////////////////////////
master.begin(4800);/////////////////////////////// HMI baud
slave.begin(4800);
Serial.begin(4800,SERIAL_8N1);///////////////////////////// ARDUINO baud
mySerial.begin(4800);////////////////////////// instrument baud
master.setTimeOut( 300000 ); // if there is no answer in 5000 ms, roll over
u32wait = millis() + 1000;
u8state = u8query = 0;
////////////////////////////////////////////////////////////instrument reset command//////////////////////////////////////////////////////////////////////////////////////////////////////////////////
mySerial.write(STX); 
mySerial.write('R');
mySerial.write(ETX);
////////////////////////////////////////////////////////external hardware///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
pinMode(8,OUTPUT);///////////Drain pump
digitalWrite(8,0);
pinMode(9,OUTPUT);///////////Methanol pump
digitalWrite(9,0);
pinMode(10,OUTPUT);//////////SY-03B injection pump
digitalWrite(10,0);
pinMode(13,OUTPUT);//////////Three-way solenoid valve
digitalWrite(11,0);
pinMode(12,OUTPUT);//////////stirring motor
digitalWrite(12,0);
}
void loop() 
{
master.poll(RW,16);
delay(10);
if(mySerial.available()){
Serial.print(mySerial.read())
}
 switch ( u8state ) {
    case 0:
      if (millis() > u32wait) u8state++; // wait state
      break;
    case 1:
      telegram.u8id = 2; // slave address 
      telegram.u8fct = 3; // function code (this one is registers read)
      telegram.u16RegAdd = 0; // start address in slave
      telegram.u16CoilsNo = 6; // number of elements (coils or registers) to read
      telegram.au16reg = RW; // pointer to a memory array in the Arduino
      Serial.print("Query");
      Serial.println(master.query( telegram )); // send query (only once)

      u8state++;
      break;
    case 2:
    
      Serial.print("POLL:");
      Serial.println(master.poll());
    
      if (master.getState() == COM_IDLE) {
        u8state = 0;
        u32wait = millis() + 2000;
      }
      break;
  }
///////////////////////////////////////////////////process //////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
while(RW[4]==0){
digitalWrite(8,1);////////////////////Drain pump open
delay(5000); 
digitalWrite(8,0);////////////////////Drain pump close
digitalWrite(13,1);///////////////////Three-way solenoid valve open
digitalWrite(10,1);///////////////////SY-03B injection pump open
delay(15000); 
digitalWrite(10,0);///////////////////SY-03B injection pump close
digitalWrite(13,0);///////////////////Three-way solenoid valve close
digitalWrite(12,1);///////////////////stirring motor open
delay(5000); 
digitalWrite(12,0);///////////////////stirring motor clsoe
digitalWrite(8,1);////////////////////Drain pump open
delay(5000); 
digitalWrite(8,0);////////////////////Drain pump close
digitalWrite(9,1);////////////////////Methanol pump open
delay(5000); 
digitalWrite(9,0);////////////////////Methanol pump close
digitalWrite(12,1);///////////////////stirring motor open
delay(5000); 
digitalWrite(12,0);///////////////////stirring motor clsoe
digitalWrite(8,1);////////////////////Drain pump open
delay(5000); 
digitalWrite(8,0);////////////////////Drain pump close
digitalWrite(9,1);////////////////////Methanol pump open
delay(5000); 
digitalWrite(9,0);////////////////////Methanol pump close
mySerial.write(STX); /////////////////instrument command for Prepare
mySerial.write('B');
mySerial.write(ETX);
digitalWrite(12,1);///////////////////stirring motor open
delay(40000);
mySerial.write(STX);//////////////////instrument command fot inject sample
mySerial.write('A');
mySerial.write(ETX);
digitalWrite(13,1);///////////////////Three-way solenoid valve open
digitalWrite(10,1);///////////////////SY-03B injection pump open
delay(15000);
digitalWrite(10,0);///////////////////SY-03B injection pump close
digitalWrite(13,0);///////////////////Three-way solenoid valve close
delay(2000);
mySerial.write(STX);//////////////////instrument command for analyze
mySerial.write('A');
mySerial.write(ETX);
delay(15000);
softwareReset::simple();
digitalWrite(8,1);////////////////////Drain pump open
delay(5000); 
digitalWrite(8,0);////////////////////Drain pump close

}
////////////////////////////////////////////////////////////////////manual open Drain pump //////////////////////////////////////////////////////////////////////////////////////////////////////////////
if(RW[5]==0){
digitalWrite(8,1);
}
////////////////////////////////////////////////////////////////////manual open Methanol pump////////////////////////////////////////////////////////////////////////////////////////////////////////////
if(RW[7]==0){
digitalWrite(9,1);
}
////////////////////////////////////////////////////////////////////manual open SY-03B injection pump///////////////////////////////////////////////////////////////////////////////////////////////////////////
if(RW[8]==0){
digitalWrite(10,1);
}
////////////////////////////////////////////////////////////////////manual open Three-way solenoid valve///////////////////////////////////////////////////////////////////////////////////////////////////////////
if(RW[9]==0){
digitalWrite(13,1);
}
////////////////////////////////////////////////////////////////////manual open stirring motor///////////////////////////////////////////////////////////////////////////////////////////////////////////
if(RW[6]==0){
digitalWrite(12,1);
}
//////////////////////////////////////////////////////////reset /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
while(RW[2]==0){
sum+=i;
i++;
if(i>3){
delay(10);
softwareReset::simple();
}
delay(10);
}
}
2

Your topic was MOVED to its current forum category as it is more suitable than the original

3

THANK YOU

4

Did you confirm HMI baud rate is 4800? Are you testing with the final (complete) sketch? You should solve this problem with a simpler test code, to eliminate complexity and isolate the issue.

5

You've made the sketch hard to read and typo error prone by hard coding the pin numbers. You should name them with variables, e.g.

const int CLOSE = 0;
const int OPEN = 1;
const int drainPin = 8;
const int methanolPin = 9;
...
digitalWrite(drainPin, CLOSE);
digitalWrite(methanolPin, OPEN);

Or, "pump" instead of "pin" if you prefer.

6

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