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LFM 4x Reader Rev1.4
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48
Customer manual
LFM 4x Reader
RFID
WE GENERATE SOLUTIONS
If there is no transponder in the reading range of the antenna, the reader repeats the reading
function several times before an error message is sent. The number of repetitions is defined in
parameter 4 (
‚r / w maxrepeat‘
). If reading is still not possible, the reader sends the error
message
‚no tag (4)‘ to the host after the repetitions have been carried out.
No confirmation is expected from the host.
For a multipage read request (98 or 99), the protocol is retried. At the end of reading, the
reader sends an additional packet.
If the sensor check is activated (parameter 1:
readmode
), the assignment of the external input
is checked before the initiation of a read process by the host. The reading process is only
started if the sensor is occupied, otherwise the error message
‚no tag (4)‘ is sent.
10.4.2 R
– Automatic read
By assigning the external input, an automatic read operation can be triggered.
The command
„R“ sends the read data to the host. The host then has to confirm the
message. Depending on the setting of the reader (parameter 1:
readmode
), the reader
reads the following pages:
Read Mode:
0
Reading the page defined in parameter 2 (
readpage
)
1
sequential reading of a transponder to the end character
(‚E‘ - end character or ‚F‘ empty) in ID bit 0 ... 3
2
Reading the entire transponder (all pages)
Device
Host
CMD
Reader-ID
Page
Data
R
1 Byte
2 Bytes
16 Bytes
Host
Device
CMD
Reader-ID
r
1 Byte
