RFID Communications

Example

Writes 'A' (41H) to the tag starting at address 0005H and continuing for the next consecutive 40 bytes. A timeout of 2 seconds (07D0H =2000 x 1 ms increments) is set for the completion of the configuration.

Command from Host

Field

Content

Header

0202H

 

 

Command Size

0008H

 

 

Command Code

04H

 

 

Start address

0005H

 

 

Size

0028H

 

 

Timeout, 2 seconds

07D0H

 

 

Data Value Byte

41H

 

 

Checksum

AEH

 

 

Terminators

03H

 

 

Response from Controller

Field

Content

Header

0202H

 

 

Response Size

0001H

 

 

Command Echo

04H

 

 

Checksum

FAH

 

 

Terminators

03H

 

 

6.5.2 ABxF Command 05H: Read

DESCRIPTION

Command 05H reads data from an RFID tag.

DISCUSSION

This command is used to read segments of data from contiguous areas of tag memory. It is capable of handling up to 1 kByte of data transferred to the host. The timeout value is given in 1 ms increments and can have a value of 1EH to FFFEH (65,534 ms). When the timeout is set to 0, the controller returns error 21H, syntax error. The Read consists of a start address and length, followed by a timeout value, and a message terminator as shown below.

Field

Content

Header

0202H

 

 

Command Size

Packet length in Bytes excluding the header, command size, checksum and terminator bytes. 0007H

 

for this command

 

 

Command

05H

 

 

Start Address

2-byte value for the starting tag address

 

 

Number of Bytes

2-byte value for the length of the read in number of bytes

 

 

Timeout

2-byte value for timeout in 1 ms units (1EH - FFFEH)

 

 

Checksum

Optional checksum

 

 

Terminator

03H

 

 

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LRP2000 Passive Reader/Writer

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Escort LRP2000 ABxF Command 05H Read, Command from Host Field Content, Aeh, Response from Controller Field Content, Fah