LRI2K datasheet(35/89 Pages) STMICROELECTRONICS

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LRI2K

Request format

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Request format

The request consists of:

●

an SOF

●

flags

●

a command code

●

parameters and data

●

a CRC

●

an EOF

13.1

Request flags

In a request, the "flags" field specifies the actions to be performed by the LRI2K and

whether corresponding fields are present or not.

The flags 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 LRI2K selection criteria.

When bit 3 is set (1), bits 5 to 8 define the LRI2K Inventory parameters.

Table 10.

General request format

Request flags

Command code

Parameters

Data

CRC

Table 11.

Definitions of request flags 1 to 4

Bit No

Flag

Level

Description

Bit 1

Subcarrier_flag(1)

Subcarrier_flag refers to the LRI2K-to-VCD communication.

A single subcarrier frequency is used by the LRI2K

Two subcarriers are used by the LRI2K

Bit 2

Data_rate_flag(2)

Data_rate_flag refers to the LRI2K-to-VCD communication

Low data rate is used

High data rate is used

Bit 3

Inventory flag

The meaning of Flags 5 to 8 is described in Table 12

The meaning of Flags 5 to 8 is described in Table 13

Bit 4

Protocol Extension flag

No Protocol format extension

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