Communicating via serial, arduino to battery device

sorry relatively new arduino.  wanting transmit code in ascii device operating @ 9600 baud , want graph example in graph form ex. battery volt. having trouble figuring serial protocol use , pins use.  device transmits @ 5 volt signal , has rj 45 plug on (phone plug 6 wires).  starting appreciated. in advance.

if new should start spending day or 2 @ tutorial section of arduino.cc there lot learn including serial communication.

serial uses pin 0 , 1 , minimal sketch captures string device looks like

code: [select]


char buffer[80];
int idx =0;

void setup()
{
  serial.begin(9600);
}

void loop()
{
  if (serial.available() >0)
  {
    char c = serial.read();
    buffer[idx] = c;
    if (c == ';')  // check ; 
    {
      buffer[idx] = 0; // end string
      // buffer contains string
      // can read data

      idx = 0;
    }
    else
    {
      idx++;
      if (idx==80) idx=0; // prevent overflow.
    }
  }
 
  // other things here
}

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