46
10.6 Module “RWH_RW”, Read UID of the ID tag asynchronously
In this mode the UID of the ID tag can be read automatically without sending any read request . This mode
is suitable if the user do not know when the ID tag is present in front of the Read-/Write head . Additionally
this mode allow the fastest detection of ID-tag cause no command request need to be send to the
evaluation unit . Please note that the UID is transmitted in real time and the PLC cycle time need to be
about factor 2 shorter as the ID tag is detected by the Read-/Write head .
PLC process data output image (Module RWH_RW)
Byte no .
Bit
7
6
5
4
3
2
1
0
1
0
DR (1)
0
0
0
0
AO=0
0
2
Not used
,,
. .
20
Not used
Description byte 1, “Control byte”:
Bit
Value
Description
Remark
AO
0
“Antenna field on” request
Activate the antenna field
DR (1)
0
No read request
Data byte 2 … 20 of the process data input image is set
to 0x00
0->1
Read diagnostics of the evaluation unit
-
1
Diagnostics read request active
DR must be kept on 1 until the command response is
available
(1) Reading of the diagnostics is only possible if ER is set to 0 . Diagnostics is only available, if bit “Diag”
within the response data is set . Otherwise the response data will return default data “0x00” within byte
2 . . .20 of the response data .
PLC process data input image (Module RWH_RW)
Byte no .
Bit
7
6
5
4
3
2
1
0
1
Diag
DR-RDY
0
0
0
0
AI=0
TP
2
UID data length read
3
UID data byte 1 ( MSBy )
4
UID data byte 2
,,
. . .
18
UID data byte 16
19
0x00
20
0x00
