OBID
i-scan
®
HF System-Manual
ID
ISC.LR1002
3.5. Scan Mode
In this operation mode the Reader autonomously sends out data to the Host as soon as a Trans-
ponder is within the detection range and valid data could be read.
In Scan Mode the contents of the message block (UID, data block) can be adapted to each user-
application. Scan mode is available via the asynchronous Interface.
The Reader starts the output of the protocol block as soon as all required data have been read
correctly from the Transponder. If the Reader is not able to read all data of a protocol block com-
pletely and without error, it does not send data. For example, if the address of the data block is
invalid, the UID of the Transponder will not be sent out.
Scan-Mode via asynchronous interface:
The data will be sent out depending on their configuration according to the following
scheme, the sequence of which cannot be changed.
Depending to the configuration and the number of Transponders in the detection range of
the Reader the transmitted protocols have a different format.
Example 1:
One Transponder in detection range and UID and data block should be read:
t
s
+ t
r
protocol block
protocol cycle
PR
UID
SC
data
EC PR
UID
FEIG ELECTRONIC GmbH
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Example 2:
3 Transponder in detection range only UID should be read:
PR UID1 EC UID2 EC UID3 EC
Example 3:
3 Transponder in detection range only data block should be read:
PR data1 EC data2 EC data3 EC
Example 4:
2 Transponder in detection range UID and data block should be read:
PR UID1 SC data1 EC UID2 SC data2 EC
PR: Com-Prefix
(optional)
ts: SCAN-LOCK-TIME
UID: Serial-Number
(fix)
tr: time
to the next new Transponder reading
data:
data blocks (free programmable)
SC
Separation character (optional)
EC
End character (optional)