I am developing an application for Motorola MC9190 RFID handheld reader.
I am in need of reading and writing information as human-readable in UHF RFID tag. So I decided to write information in ASCII characters.
On doing some research, I found that it is possible to write ASCII character in RFID tag memory but it supports less characters. I wouldn't mind until it is less than 10 characters.
references:
http://blog.atlasrfidstore.com/types-of-memory-in-gen-2-uhf-rfid-tags
Now, I am little bit confused how do I write and read ASCII character directly in reader.
This is the code for writing in hexadecimal character.
private void writeButton_Click(object sender, EventArgs e)
{
string dataToWrite="ABCDEF9876";
Symbol.RFID3.TagAccess.WriteAccessParams m_WriteParams;
m_WriteParams.AccessPassword = 0;
m_WriteParams.MemoryBank = MEMORY_BANK.MEMORY_BANK_USER;
m_WriteParams.ByteOffset = 0;
m_WriteParams.WriteDataLength = 6;
byte[] writeData = new byte[m_WriteParams.WriteDataLength];
for (int index = 0; index < m_WriteParams.WriteDataLength; index += 2)
{
writeData[index] = byte.Parse(dataToWrite.Substring(index * 2, 2),
System.Globalization.NumberStyles.HexNumber);
writeData[index + 1] = byte.Parse(dataToWrite.Substring((index + 1) * 2, 2),
System.Globalization.NumberStyles.HexNumber);
}
m_WriteParams.WriteData = writeData;
string m_SelectedTagID = "0123456789ABCDEF"; //for example
RunWriteOperation(m_SelectedTagID,m_WriteParams);
}
void RunWriteOperation(string m_SelectedTagID,Symbol.RFID3.TagAccess.WriteAccessParams m_WriteParams)
{
if (m_SelectedTagID != String.Empty)
{
m_ReaderAPI.Actions.TagAccess.WriteWait(m_SelectedTagID,m_WriteParams, null);
}
}
If I want to write in ASCII, it should be encoded as ASCII bytes I guess. So instead of for loop, if I replace the following code, will it write successfully?
string dataToWrite="HELLOWORLD";
byte[] writeData = ASCIIEncoding.ASCII.GetBytes(dataToWrite);
Since I don't have the reader with me, I could not able to test now.
If it gets success, when reading the tag, how can I configure the reader to decode as ASCII character and display it or should I need to convert programmatically?
Since I am new to RFID technology, I am not sure I have done the research correctly. Please correct me if I am wrong.
void hex2dec(unsigned adchex,unsigned value)
{
unsigned value[4];
for(i=0;i<4;i++)
{
value[i]=adchex%10;
// value[i]=adchex%10+0x30; //for ASCII presentation
adchex=adchex/10;
}
}
You can also take a look at this SDK here: http://www.tsl.uk.com/2013/07/tsls-ios-uhf-ascii-2-0-sdk-v0-8-1-now-available/
TSLAsciiCommands.framework - a set of easy-to-use Objective C classes encapsulating the TSL UHF ASCII 2.0 protocol provided as a universal static framework that can be used with both iOS devices and the iOS simulator - TSL ASCII 2.0 SDK Documentation – available as a docset for integration within Xcode and in HTML format - Quick-start Sample Xcode Projects
If you use the TSLAsciiCommands framework you can do something like this.
-(void)initAndShowConnectedReader
{
if( _commander.isConnected )
{
// Display the serial number of the successfully connected unit
[self.selectReaderButton setTitle:_currentAccessory.serialNumber forState:UIControlStateNormal];
// Ensure the reader is in a known (default) state
// No information is returned by the reset command
TSLFactoryDefaultsCommand * resetCommand = [TSLFactoryDefaultsCommand synchronousCommand];
[_commander executeCommand:resetCommand];
// Notify user device has been reset
if( resetCommand.isSuccessful )
{
self.resultsTextView.text = [self.resultsTextView.text stringByAppendingString:@"Reader reset to Factory Defaults\n"];
}
else
{
self.resultsTextView.text = [self.resultsTextView.text stringByAppendingString:@"!!! Unable to reset reader to Factory Defaults !!!\n"];
}
// Update the version information for the connected reader
[_commander executeCommand:self.versionInformationCommand];
if( [self.class comparableVersionValue:self.versionInformationCommand.asciiProtocol] < [self.class comparableVersionValue:MINIMUM_ASCII_PROTOCOL_VERSION_FOR_LICENCE_KEY_COMMAND] )
{
[self updateResults:[NSString stringWithFormat:@"Reader does not support licence keys\nRequires ASCII protocol: %@\nReader ASCII protocol: %@\n",
MINIMUM_ASCII_PROTOCOL_VERSION_FOR_LICENCE_KEY_COMMAND,
self.versionInformationCommand.asciiProtocol
]];
}
[self validateReader];
}
else
{
[self.selectReaderButton setTitle:@"Tap to select reader..." forState:UIControlStateNormal];
[self updateUIState];
}
}
or
// Write data to general tag memory
string tagDataStr = "HELLO WORLD!";
byte[] tagData = ASCIIEncoding.ASCII.GetBytes(tagDataStr);
byte memBank = 0; // Different memory banks serve different purposes. See MC9190 specifications.
int addr = 0;
byte words = (byte)(tagData.Length / 2); // Words = length of msg / 2
if (UHFWriteTagData(theHandle, readerType, memBank,addr, tagData, (byte)tagData.Length, out errValue) == 0)
{
// Handle Error
}
// Read data from tag memory
byte[] readTagData = new byte[512];
int bytesRead;
if (UHFReadTagData(theHandle, readerType, memBank, addr, words, readTagData,
readTagData.Length, out bytesRead, out errValue) == 0)
{
// Handle Error
}
// Display Results
string results =
"Input tag ID: " +
tagIDStr +
Environment.NewLine +
"Read tag ID: " +
ASCIIEncoding.ASCII.GetString(readTagID).Replace('\0','-') +
Environment.NewLine +
"Input tag data: " +
tagDataStr +
Environment.NewLine +
"Read tag data: " +
ASCIIEncoding.ASCII.GetString(readTagData).Replace('\0', '-').Substring(0,bytesRead) +
Environment.NewLine;
MessageBox.Show(results);