User's Manual
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6 Appendix
6.1 Glossary
Telegram: Sequence of 64 data bits transferred from the transponder to the reader.
Superimposition: Number of superimposed telegrams for an improved signal to noise ratio ad-
justed by the parameter NRD.
Reading: Interval of several telegrams, whose number is fixed by NRD. The result of a
reading is a transponder number or NoRead. In contrast to the reading process
a reading does not appear at an external interface, that means the result is
processed within the reading algorithm only.
NoRead: If it is not possible to determine a transponder number (no header, wrong par-
ity, ...), then the reader operates for the next internal operations with the trans-
ponder number FF FFFF FFFF (Hex) as NoRead information.
NID: This parameter sets the number of readings with identical transponder number,
which have to appear within one reading cycle for the result ”successful reading
cycle”.
Reading cycle: Interval of several readings. The maximum length of intervals is fixed by the
values of NRD and NID. A reading cycle is successful if within the reading cycle
the number of readings specified by NID yields the same result.
Reading process: Interval of several readings. A reading process is started with occurrance of the
trigger condition. The reading process is either terminated by occurrence of a
successful reading cycle or through a break (time out, falling edge of the exter-
nal trigger signal)
8
. At the end of a reading process appears always a result on
the interface
9
.
6.2 list of control characters
Steuerzeichen Hexcode Bezeichnung Funktion
SP 20H space character separates commands from parameters
CR 0DH carriage return terminates command line
NAK 15H negative acknowledge error code
# 23H number sign error number
DEL 7FH delete change of operation mode after a cold
start
table 6.1: List of the control symbols used
8
In operating mode 0 is a reading process equal to a reading cycle.
9
The result will not appear when a data filter suppresses the result (e.g. NoRead suppression).