SBL1360 RS232 to Arduino TTL Issue

DB9 Female To PC		DB15 Male To Controller
Pin 2 (RX Data)		-	Pin 2 (Data Out)
Pin 3 (TX Data)		-	Pin 3 (Data In)
Pin 5 (GND)		-	Pin 5 (GND)

^RWD 0

%EESAV

?A

!G 1 500

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
}

void loop() {
  // put your main code here, to run repeatedly:
  Serial.print("!G 1 500_");
  delay(1000);
}

// I use arduino Mega, Serial1 to connect to the RoboteQ and Serial to see the results on the Serial Monitor of the Arduino IDE
Serial1.println("?V_?A_?C 1_?T_?FF_?FS\r" );       // Here I am requesting some telemetry elements to the roboteq and I am using Serial1 on arduino Mega
    unsigned long recTime = millis();                         // Here I am starting to compose the incoming string
    while (Serial1.available() > 0  || millis()-recTime<50) {
      char inChar = (char)Serial1.read();     // get the new byte:
      inputString += inChar;
      if(inputString.indexOf("FS=")<inputString.lastIndexOf('\r'))
        stringComplete = true;
    }
    
    
    if(stringComplete) {
      Serial.println(inputString);  // Print entire string from controller on the Serial Monitor of your IDE

                                    // OR print just the piece of information you want, in this case is voltage      
      
      if(dispVoltage1 == 0.0 || abs(parseReceivedValue(inputString,"V=",":",":",10.0) - dispVoltage1) <= 10.0)
        dispVoltage1 = parseReceivedValue(inputString,"V=",":",":",10.0);
      Serial.println(dispVoltage1);

void setup() {
  // put your setup code here, to run once:
  Serial1.begin(115200);
}

void loop() {
  // put your main code here, to run repeatedly:
  Serial1.println("!G 1 500_");
}

void setup() {
  // put your setup code here, to run once:
  Serial1.begin(115200);
}

void loop() {
  // put your main code here, to run repeatedly:
  Serial1.print("a");
  delay(1);
}