OBID i-scan
®
System-Manual
ID ISC.LR200
FEIG ELECTRONIC GmbH
Page 58 of 174
H90692-16e-ID-B.doc
DIFF-HASH:
(only I-Code 1 Transponders)
Value with which the Hash-Value will be changed between two Transponder selections.
Bit:
7
6
5
4
3
2
1
0
Function
0
0
0
DIFF-HASH
MIN-HASH:
(only I-Code 1 Transponders)
Minimum Hash-Value.
Bit:
7
6
5
4
3
2
1
0
Function
0
0
0
MIN-HASH
MAX-HASH:
(only I-Code 1 Transponders)
Maximum Hash-Value.
Bit:
7
6
5
4
3
2
1
0
Function
0
0
0
MAX-HASH
The Hash Value and the serial-number of the I-Code 1 Transponder define in which timeslot
the Transponder will respond. The hash value starts with MIN-HASH and will be increased
with DIFF-HASH after each Transponder select. If the hash value is higher than MAX-HASH
the difference between the hash value and MAX-HASH will be added to MIN-HASH. To set up
a fixed hash-value, both MIN-HASH and MAX-HASH must contain the value of the desired
hash value and
DIFF-HASH
is ignored.
hash values
MIN-HASH
MAX-HASH
DIFF-HASH
0
0
0
ignored
0 – 4 – 8
0
8
4
0 – 4 – 8 – 2 – 6 – 10
0
10
4
Note:
•
If the anticollision-select mode is disabledd the Reader uses hash value = 0 for
Transponder communication.
COLLISIONS:
(only I-Code 1 Transponders)
These parameters are used to calculate the expected number of timeslots in the antenna field.
The used formula is:
timeslots
≥
TS-TR * (
weak collisions
* TR-WEAK +
strong collisions
* TR-COLL +
crc errors
* TR-CRC)
The calculated number of timeslots is rounded up to a valid value within MIN-TS and MAX-TS.
Byte
4
5
Bit
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Function
TS-TR
TR-WEAK
TR-COLL
TR-CRC
TS-TR:
Number of timeslots per supposed Transponder on the air interface.
TR-WEAK:
Number of Transponders per weak collision on the air interface.
TR-COLL:
Number of Transponders per collision on the air interface.
TR-CRC:
Number of Transponders per CRC error on the air interface.
