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RFID channel

Registers in RFID channel:

RegNo	Identifier	Memory type	Read Out	Type
0	TagData	RAM Read Write	-------	Record
1	TimeFromLastGoodRead	RAM Read Write	Decimal	Real
2	TimeToNextRead	RAM Read Write	Decimal	Real
3	ReaderStatus	RAM Read Write	-------	Record
4	TuningStatus	RAM ReadOnly	-------	Record
5	ReadIntervalTime	RAM init EEPROM	Decimal	Real
6
7
8
9	ChConfig	EEPROM RPW	-------	Record
10
11
12
13
14	Guid	PROM Read only	-------	String
15	ChError	RAM Read Write	-------	Record

RegNo 0: TagData

TagData = Record
	Identification:	Array[1..8]of Byte;
	TagType:	Byte;
End;

Identification:

This variable contains the 64 bits / 8 bytes data from the transponder.

TagType:

= 0	=> No tag
= 1	=> ISO HDX (half duplex)
= 2	=> ISO FDX-B (full duplex)
= 3	=> Industrial HDX
= 4	=> Not used

RegNo 1: TimeFromLastGoodRead [s]

TimeFromLastRead:

Real;

TimeFromLastGoodRead is preset to zero every time valid data from a RFID tag is read. The timer increments and is set to 0 when the timer reaches the maximum value for a Real: 3.4 * 10E38. This register is cleared after a power failure.

RegNo 2: TimeToNextRead [s]

TimeToNextRead:

Real;

TimeToNextRead is the timer that is used to control the activation of the exciter. Every time this variable becomes zero, a single read is performed. The timer is either preset via P-NET, or from register 5 ReadTimeInterval. The timer counts down and count continues through negative values. This register is cleared after a power failure.

The preset time in ReadTimeInterval is copied to this register at the time a read is started.

RegNo 3: ReaderStatus

Record
	NumberOfAttempedReads:	LongInteger;
	NumberOfSucessfulReads:	LongInteger;
End;

NumberOfAttemtedReads

This counter is incremented each time the module activates the exciter to read a tag. The counter counts up to a maximum of 2147483647. When the counter exceeds +2147483647, it restarts at -2147483648.

NumberOfSucessfulReads

This counter is incremented when the module reads a valid tag. The counter counts up to a maximum of 2147483647. When the counter exceeds +2147483647, it re-starts at -2147483648.

RegNo 4: TuningStatus

Record
	Exciterfrequency	LongInteger;
	TuningResult	Byte;
	AntennaVoltage	Integer;
End;

Exciterfrequency

The Exciterfrequency must be in the range 125 kHz +/- 500 Hz or 134.2 kHz +/- 500 Hz.

TuningResult

TuningResult indicates the result of the built in system tuning.

The value is in the range 0-63.  If the value is 0 or 63, the Exciterfrequency should be checked to locate the error.

AntennaVoltage

The variable indicates the voltage measured across the Antenna.

RegNo 5: ReadIntervalTime

ReadIntervalTime:

Real;

ReadIntervalTime is the time in seconds that is used as the preset value for register 2 TimeToNextRead. To activate continuous reading the ReadIntervalTime can be set to 0 sec.

ReadIntervalTime is factory set to 0.0 sec.

RegNo 9: ChConfig

The ChConfig variable is a record of the following type:

Record
	Enablebit:	Bit8;
	Functions:	Byte;
	Notification:	Bit8;
	User:	Byte;
End;

where each field is interpreted as follows:

Enablebit :

7	0
		0: ISO HDX and FDX (134.2 kHz)
		1: EM4102 (125 kHz)
		2: Not used
		3: Not used
		4: Not used
		5: Not used
		6: Not used
		7: AlwaysTuneBeforeRead

Enablebit [0] = True, enables the reader to read ISO HDX and FDX tags at 134.2 kHz.

Enablebit [0] is enabled from factory.

Enablebit [1] = True, enables the reader to read EM4102 tags at 125 kHz.

Enablebit [1] is disabled from factory.

If the Enablebit [0] and Enablebit [1] are set to True, the reader will read at both frequencies, starting the read cycle at 134.2 kHz followed by reading at 125 kHz .

In  a case where all Enablebits are set to False, the module will not attempt any reads.

Enablebit [7] = True, enables the reader to perform autotuning before each read cycle.

Enablebit [7] is factory set to False.

Enablebit [2-6] are not used but are reserved for future use.

EM4102 (125 kHz) and AlwaysTuneBeforeRead is supported in version 1.01 or higher.

Functions :        

= 0	=> Standard mode
= 1	=> Clear TagData

Standard mode:

In standard mode TagData is updated every time the module receives a complete identification telegram. TagData is held until the next good read of a tag.

Clear TagData:

In this mode data are cleared when the TimeToNextRead timer reaches the value zero.

EnableNotification

7	0
		0: Change_in_ChError.Act
		1:
		2:
		3:
		4:
		5:
		6: