MB89R112 datasheet(14/49 Pages) RAMXEED

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MB89R112

DS411-00004-3v0-E

8. Anti-Collision Algorithm

The MB89R112 executes an anti-collision sequence loop based on ISO/IEC 15693.

The Anti-collision algorithm is designed to examine the transponders located within reader/writer communi-

cation areas on the basis of UID.

The reader/writer issues an Inventory command to transponders, and some transponders return responses

while other transponders do not respond, according to the algorithm described in “10. Execution of Inventory

Command by a Transponder”.

9. Request Parameter



Request Parameter Settings

Set the reader/writer as follows before issuing the Inventory command.



The Nb_slots_flag (bit 6), which is a request flag, is set to the desired value :

“0” : 16 slots (for plural transponders)

“1” : 1 slot (for single transponder)



A mask length and a mask value are added after the command code.



The mask length represents the data length of the mask value in bits.



The mask value is integer bytes of data, transmitted beginning with the lowest bit. If the mask data is not

a multiple of 8 (bits) in length, 0 is padded on the MSB side of the mask value so that the data is in units

of bytes.

The following figure shows an example of the mask value with padding. Since the mask length is 12 bits,

the mask value is padded with 4 bits on the MSB side so that the mask data is in units of bytes (2 bytes =

16 bits in this case).

If the AFI flag in the request flags is set in the format explained in “ Structure of the request frame of 6.

Request Format”, an AFI field is added to the format. The command ends with transmission of an EOF signal

as described in “1. Communication from Reader/Writer to Transponder”. Thereafter, processing in the first

slot starts immediately. To proceed to the next slot, the reader/writer sends an EOF signal.



Format of the Command

SOF

Flag

Command code Optional AFI Mask length Mask value

CRC

EOF

8 bits

0 to 64 bits

16 bits

MSB

Pad

LSB

0000

0100 1100 1111

Mask value



Example of the Mask Value with Padding

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