Start-up
D101925 0412 -
BLident®
UHF
3-4
Table 11:
Meaning of the
command bits
Designat
ion
Meaning
XCVR
1
: The read/write head is activated.
0
: The read/write head is deactivated (no signal transmission is taking place).
The read/write head must first be activated before another command can be initiated
with a subsequent process image.
If XCVR = 0 while the
BL ident®
system is processing the execution of a command, the
command is not executed until the end. The read/write head is then not deactivated
until the status bit “DONE = 1”.
NEXT
1
: Exactly one command can be executed with the same data carrier.
If another command is initiated with the same data carrier, the status bit BUSY = 1.
The
BL ident®
system must be reset (RESET) or the command must be executed with a
different data carrier.
0
: Function is not used.
TAG_ID
0 -> 1
: The rising edge initiates the command for reading the lowest 8 bytes of the UID.
The command is not executed until there is a data carrier in the sensing range of the
read/write head.
0
: Function is not used.
READ
0 -> 1
: The rising edge initiates the read command. The command is executed if there
is a data carrier in the sensing range of the read/write head.
The byte number Byte_Count_0...Byte_Count_2 is read from the data carrier address
AddrLo, AddrHi.
0
: Function is not used.
WRITE
0 -> 1
: The rising edge initiates the write command. The command is executed if there
is a data carrier in the sensing range of the read/write head.
The byte number “ByteCount0..ByteCount2” is written to the data carrier address
“AddrLo, AddrHi”.
0
: Function is not used.
