How to read directly from Serial1? (baby steps into CASIC)

First success! CASIC response received and parsed.

var h1=0,h2=0, l1=0,l2=0,
    cs1=0,cs2=0,cs3=0,cs4=0,
    protocolType="Unknown",
    casicPos=-1, payloadPos=0,
    inCasicMessage=false, casicIsCompleted=false;
var casicMsg={};

function parseCASIC(data){
  for(var i=0;i<data.length;i++){
    c=data.charCodeAt(i);
    //print("i:",i,"c:",c, "casicPos:",casicPos,"payloadPos:",payloadPos);
    if(c==0xBA && casicPos<0){
      h1=c;
      protocolType="CASIC";
      inCasicMessage=true;
      casicIsCompleted=false;
      casicPos=0; payloadPos=0;
      h2=0; l1=0; l2=0; cs1=0;cs2=0;cs3=0;cs4=0;
      casicMsg={};
    }
    else if(!inCasicMessage) return;
    else if(c==0xCE && casicPos==0){
      h2=c;
      casicPos++;
      casicMsg.hdr = (h1<<8) + h2;
    }
    else if(inCasicMessage && casicPos==1){
      l1=c;
      casicPos++;
    }
    else if(inCasicMessage && casicPos==2){
      l2=c;
      casicPos++;
      casicMsg.len = (l2<<8) + l1;
    }
    else if(inCasicMessage && casicPos==3){
      casicMsg.class = c;
      casicPos++;
    }
    else if(inCasicMessage && casicPos==4){
      casicMsg.msgId = c;
      casicMsg.payload=[];
      payloadPos=0;
      casicPos++;
    }
    else if(inCasicMessage && casicPos>4 && payloadPos<casicMsg.len){
      casicMsg.payload.push(c);
      payloadPos++;
      casicPos++;
    }
    else if(inCasicMessage && casicPos==casicMsg.len+5){
      cs1 = c;
      casicPos++;
    }
    else if(inCasicMessage && casicPos==casicMsg.len+6){
      cs2 = c;
      casicPos++;
    }
    else if(inCasicMessage && casicPos==casicMsg.len+7){
      cs3 = c;
      casicPos++;
    }
    else if(inCasicMessage && casicPos==casicMsg.len+8){
      cs4 = c;
      casicMsg.checkSum = (cs1<<24)+(cs2<<16)+(cs3<<8)+cs4;
      inCasicMessage = false;
      casicIsCompleted = true;
      casicPos = -1;
      protocolType="Unknown";
      print(casicMsg);
    }
  }//for
}

D29.write(0);
Serial2.removeAllListeners();
Serial2.setup(9600,{rx:D30,tx:D31});
Serial2.on('data', function(data){parseCASIC(data);});
D29.write(1);

some pause

//CFG-PRT query
Serial2.write([0xBA,0xCE, 0x00,0x00, 0x06,0x00, 0x00,0x00,0x06,0x00]);
=undefined
{ "hdr": 47822, "len": 8, "class": 6, "msgId": 0,
  "payload": [ 1, 7, 192, 8, 0, 194, 1, 0 ],
  "checkSum": 164218632 }
{ "hdr": 47822, "len": 8, "class": 6, "msgId": 0,
  "payload": [ 0, 119, 192, 8, 128, 37, 0, 0 ],
  "checkSum": -2002991608 }
{ "hdr": 47822, "len": 4, "class": 5, "msgId": 1,
  "payload": [ 6, 0, 0, 0 ],
  "checkSum": 167773441 }
>