RFId Read/write module DEAD...????

alexkulet

hi everyone... i got my new PARALLAX RFID READ/WRITE module and try to interface with arduino... i tried my code from the net...and sad to say nothing works...seems the reader didn't response to the tag and failed to transmit data....i wondering if my rfid is dead... does anyone knows how to test if the rfid is working well.... thanks in advance... buy the way....i tried codes from this website... http://arduino.cc/playground/Learning/ParallaxRFIDreadwritemodule...do i need to replace my rfid... help please/..

Franklin

Could you attach your code and your connections? That will help. Have you asked on the Arduino forums?

alexkulet

yeah im sorry,..i forgot....here is the code that i used and i search that in the arduino forum....
the following connection are....
5 volts dc to VCC
Pin 6 to SIN
Pin 8 to SOUT
0 volts to GROUND


Here is the sample code.....
#include <NewSoftSerial.h>
#define RFID_WRITE 0x02
#define txPin 6
#define rxPin 8


#define whichSpace 4


#define first 1
#define second 26
#define third 3
#define fourth 27


NewSoftSerial mySerial(rxPin, txPin);


void setup()
{
Serial.begin(9600);
Serial.println("RFID Write Test");
mySerial.begin(9600);
pinMode(txPin, OUTPUT);
pinMode(rxPin, INPUT);
}





void loop()
{
int val;

mySerial.print("!RW");
mySerial.print(RFID_WRITE, BYTE);
mySerial.print(whichSpace, BYTE);
mySerial.print(first, BYTE);
mySerial.print(second, BYTE);
mySerial.print(third, BYTE);
mySerial.print(fourth, BYTE);


if(mySerial.available() > 0) {
val = mySerial.read();
if (val == 1) //If data was written successfully
{ Serial.println("Data written succesfully!");

}
else Serial.println("Error Code: ");
//If an error occured during writing, discard all data recieved from the RFID writer
}
delay(250);
}


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the following code generates and output of
Erro Code: 2
Erro Code: 2
Erro Code: 2
Erro Code: 2
Erro Code: 2

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and according to the datasheet of the parallax 28440
Error Checking


Value Name Description
0x01 ERR_OK No Errors
0x02 ERR_LIW Could not find a Listen Window (LIW) from the tag
0x03 ERR_NAK Received a No Acknowledge (NAK), possible communication error or
invalid command/data
0x04 ERR_NAK_OLDPW Received a No Acknowledge (NAK) sending the current password during
the RFID SetPass command, possible incorrect password
0x05 ERR_NAK_NEWPW Received a No Acknowledge (NAK) sending the new password during the
RFID SetPass command
0x06 ERR_LIW_NEWPW Could not find a Listen Window (LIW) from the tag after setting the new
password during the RFID SetPass command
0x07 ERR_PARITY Parity error when reading data from the tag



///////////////////////////////////////////////////////////////////////////////
the error above correspond to the error 0x02 which is the ERR_LIW could not find a listen Window(LIW) from the tag...
i don't know what is the meaning of this..can somebody give me an advice how to solved it.... thank you in advance.....

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