LRIS2K_11 Datasheet, PDF (42/98 Pages) STMicroelectronics – 2048-bit EEPROM tag IC at 13.56 MHz, with 64-bit UID and Password, ISO15693 and ISO18000-3 Mode 1 compliant

Request format
15 Request format
LRIS2K
The request consists of:
● an SOF
● flags
● a command code
● parameters and data
● a CRC
● an EOF
Table 16. General request format
S
O Request_flags
F
Command code
Parameters
Data
E
CRC O
F
15.1
Request_flags
In a request, the “flags” field specifies the actions to be performed by the LRIS2K and
whether corresponding fields are present or not.
The flag field consists of eight bits.
The bit 3 (Inventory_flag) of the request_flag defines the contents of the 4 MSBs (bits 5 to
8).
When bit 3 is reset (0), bits 5 to 8 define the LRIS2K selection criteria.
When bit 3 is set (1), bits 5 to 8 define the LRIS2K Inventory parameters.
Table 17. Definition of request_flags 1 to 4
Bit No
Flag
Level
Description
Bit 1 Subcarrier_flag⁽¹⁾
Bit 2 Data_rate_flag⁽²⁾
Bit 3 Inventory_flag
Bit 4 Protocol Extension_flag
0 A single subcarrier frequency is used by the LRIS2K
1 Two subcarrier are used by the LRIS2K
0 Low data rate is used
1 High data rate is used
0 The meaning of flags 5 to 8 is described in Table 18
1 The meaning of flags 5 to 8 is described in Table 19
0 No Protocol format extension
1. Subcarrier_flag refers to the LRIS2K-to-VCD communication.
2. Data_rate_flag refers to the LRIS2K-to-VCD communication
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