User's Manual

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Error Messages
Error numbers Error No. Error Cause
Hex ASCII description
30 '0' no error
31 '1' No data carrier No data carrier in the active zone of the read/write head.
present
45 'E' CRC error The CRC on the data carrier does not agree with the
calculated CRC for the read data.
L-400_835996_0803_E.p65
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Timing Diagrams
When a data carrier enters the read zone of the processor, the latter sends the ASCII
character 'ENQ'. The data can only by requested by sending 'DLE'. The data can be
requested until the next data carrier enters the read zone of the processor.
Data carrier is in
read zone
Data are ready in
the processor during
Tag Present (checked
multiple times).
Processor sends
'ENQ'. Controller
replies with 'DLE'.
Data are sent.
t
1
< 140 ms: Read head gets data from data carrier and sends them to the processor.
t
2
: Duration is determined by the presence of the data carrier in the read zone.
t
3
: Data ready time: During this time the data must be retrieved.
t
4
< 1 ms: Response time between 'DLE' and data transferred.
1
0
t
1
t
2
t
3
t
4
Reading the data
without Reset
Data carrier
No. n
Tag Present
Tag
Present
DLE
ENQ
Data carrier
No. n+1
DLE
ENQ
Data
TxD
If the 'SYN' character is sent while the data carrier is in the read zone, the data are read again and
output to the port. If there is no data carrier in the read zone, no data are output.
RxD