52
PLC process data input image (Module RWH_RW)
Byte no .
Bit
7
6
5
4
3
2
1
0
1
Diag
DR-RDY
0
UD=1
RD-RDY
WR-RDY
AI
TP
2
Write data length
3
0x00
,,
. . .
20
0x00
Description Byte 1, “Status byte”:
Bit
Value
Description
Remark
TP
0
No RFID tag detected in front of the read/
write head
-
1
RFID tag is detected in front of the read/
write head
Bit is set to 1 as long as the RFID tag is detected by the
Read/write head . With the channel parameter “data hold
time” the status of the bit can be extended .
AI
0
“Antenna field on” request active
-
1
“Antenna field off” request active
-
WR-RDY
RD-RDY
0
No command request detected or
command execution active .
-
1
Command execution is ready .
Result of the comparison is given back in byte 2 .
UD
1
Mode “Write User data of the RFID tag”
active
Feedback of the selected mode .
DR-RDY
0
No diagnostic read request or diagnostic
data not ready .
-
1
Diagnostics read request from evaluation
unit ready .
Error code:
Byte 2: Number of diagnostic events
Byte 3-6: Diagnostic message 1
Byte 7 . .10: Diagnostic message 2
Byte 11 . .14: Diagnostic message 3
Byte 15 . .18:
Diagnostic message 4
Diag
0
No error detected
-
1
evaluation unit diagnostics available
Maybe channel related or channel independent error
occurred .
Description Byte 2, ”Read data length”:
If the comparison of the written and read data is successful the read data length is identical to the write
data length .
Description Byte 3... 20:
These bytes contain the User data read back from the RFID tag .
In read diagnostics mode this data area contains detailed error codes .
