Hi,
I've started working on a project that involves developing a Radio Frequency ID (RFid) application for a PDA. There are hardly any instructions on how to use the tag's code in VB.NET.
RFid tags produce a magnetic field that can be read by a reader, and each has a unique identifying number so different actions can be performed when each tag is read.
All I've been given are the following instructions to read data from a Compact Flash RFid reader...
In the absence of a formal SDK, I offer you the data format for reading the tags as follows:
STX(1BYTE), RFID_ID(4BYTE) totally 5 ASCII characters
STX is 0x02h
RFID_ID include 4 bytes, representing a 2 bytes unsigned integer,
such as ID=10811, the hexadecimal expression will be 0x2Ah, 0x3Bh
while it can be expressed as 4 bytes ASCII characters: 2, A, 3, B.
Therefore, the data PC received for a tag with ID=10811 is :
Expression in ASCII : STX 2 A 3 B
Expression in hexadecimal: 0x02h 0x32h 0x41h 0x33h 0x42h
Starting with 0X02h, the following 4 bytes represent an ID number.
This is near-enough meaningless to me, except I understand that the tag ID (each RFid tag has a unique ID) is 4 bytes after 0x02h, could anyone here help explain what the above means and help me work out how to read a RFid tag?
Thanks for your help.
I've started working on a project that involves developing a Radio Frequency ID (RFid) application for a PDA. There are hardly any instructions on how to use the tag's code in VB.NET.
RFid tags produce a magnetic field that can be read by a reader, and each has a unique identifying number so different actions can be performed when each tag is read.
All I've been given are the following instructions to read data from a Compact Flash RFid reader...
In the absence of a formal SDK, I offer you the data format for reading the tags as follows:
STX(1BYTE), RFID_ID(4BYTE) totally 5 ASCII characters
STX is 0x02h
RFID_ID include 4 bytes, representing a 2 bytes unsigned integer,
such as ID=10811, the hexadecimal expression will be 0x2Ah, 0x3Bh
while it can be expressed as 4 bytes ASCII characters: 2, A, 3, B.
Therefore, the data PC received for a tag with ID=10811 is :
Expression in ASCII : STX 2 A 3 B
Expression in hexadecimal: 0x02h 0x32h 0x41h 0x33h 0x42h
Starting with 0X02h, the following 4 bytes represent an ID number.
This is near-enough meaningless to me, except I understand that the tag ID (each RFid tag has a unique ID) is 4 bytes after 0x02h, could anyone here help explain what the above means and help me work out how to read a RFid tag?
Thanks for your help.
