MB89R119B datasheet(14/46 Pages) RAMXEED

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MB89R119B

DS411-00002-4v0-E

6. Request Format

Figure shows a typical example of the request data format, and Table shows the definition of request flag bits.



Request flags bit 1 to bit 4 definition

* : Reserved for Future use

Note : “Inventory_flag” of bit3 is determined whether “Inventory command” (select “1”) or other command (select

“0”) is used.



Request flags bit 5 to bit 8 definition (When Inventory command is selected [Inventory_flag = “1”])

* : Reserved for future use

Bit

Flag name

Value

State/Description

Sub-carrier_flag

One subcarrier selected

Two subcarriers selected (not supported)

Data_rate_flag

Low data rate (6.62 kbps) selected

High data rate (26.48 kbps) selected

Inventory_flag

Command other than Inventory command selected

Inventory command selected

Protocol_Extension_flag

Protocol not extended

Protocol extended (RFU)

Bit

Flag name

Value

State/Description

AFI_flag

AFI not set

AFI set (response when it is in accord with AFI of the

transponder)

Nb_slots_flag

16 slots

1 slot

Option_flag

Command option not supported

Command option supported (not supported)

RFU*

Set to “0”





Structure of the request frame

SOF

Flags

Command code

Parameters

Data

CRC

EOF

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