Trying to connect FT sensor to Arduino Mega using RX TX I am trying to interface this sensor, https://www.robotous.com/forcetorquesensor (RTF60-HA01-C), with the Arduino Mega. The sensor has an input voltage of 5Vs and communicates using CAN/RS232/RS422. I am using the RS232 and have connected wires properly and have tried to establish Serial Communication using the below code. 

#include&lt;String.h&gt;
# define BuffSize 32

byte buff[BuffSize];
unsigned char data_field[16];
byte comm[11]  = {0x55, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xAA};
// SOP == 0x55, EOP == 0xAA, Checksum == summation of each data in data_field
void setup() {

  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial2.begin(115200);
  for (int i = 0; i &lt; BuffSize; i++) {
    buff[i] = 13; //Number to initialise buffer
  }

}

  void loop() {
    // put your main code here, to run repeatedly:

     Serial2.write(comm, 11);
    //Serial.println(Serial2.available());
    if (Serial2.available() &gt; 0) {
      //int read = Serial2.readBytes(buff, BuffSize);
        String output = "";
        for(int i=0;i&lt;BuffSize;i++){
        buff[i]=Serial2.read();
        output = output + buff[i] + "|";
     }
  //Serial.println(read);
    Serial.flush();

    Serial.println(output);
    Serial.println();

    }
  }


The output I receive is just 0s and the occasional 10. Like below

0|0|0|0|0|0|0|0|10|0|0|0|0|0|0|0|0|10|0|0|0|0|0|0|0|0|10|255|255|255|255|255|


I am new to this and hope this is not a stupid question. 
Let
The Serial RX and TX pins of an Arduino are not RS-232 compatible without using some type of circuit to give you the proper voltage levels.

**RS-232 logic and voltage levels**
0 (space)   Asserted    +3 to +15 V
1 (mark)    Deasserted  −15 to −3 V 


Connecting the RX/TX pins of an Arduino directly to an RS-232 device may fry your Arduino in addition to just not working for communication.  This circuit given below is an example what you'll need.  There are pre-made adapter boards available for a few dollars.