RFID Communications

This example places the controller in Continuous Read mode and reads eight bytes of data from the tag, starting at address 0001H. A delay between identical reads of 2 seconds (0002H = 2 x 1 second increments) is set.

Command from Host

Field

Content

Header

0202H

 

 

Command Size

0006H

 

 

Command Code

0DH

 

 

Start Address

0001H

 

 

Number of Bytes

0008H

 

 

Delay Between Duplicate Decodes

02H

 

 

Checksum

E1H

 

 

Terminator

03H

 

 

Response from Controller

Field

Content

Header

0202H

 

 

Response Size

0001H

 

 

Command Echo

0DH

 

 

Checksum

F1H

 

 

Terminator

03H

 

 

6.5.7 ABxF Command 14H: Get Memory Status

DESCRIPTION

Command 14H returns the lock status of the specified blocks of data.

DISCUSSION

This command can be used to determine whether blocks of tag memory are locked (marked read-only). The number of specified contiguous blocks are addressed from the specified first block. The response from the controller gives the status of each block through a one-byte value. The value is 00H if the block is unlocked, 01H if locked.

Field

Content

Header

0202H

 

 

Command Size

Packet length in bytes excluding the header, command size, command, checksum, and terminator

 

bytes. 0005H for this command

 

 

Command

14H

 

 

First Block

One-byte address of the first block to be Interrogated.

 

 

Number of blocks

One-byte

 

 

Timeout

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

 

 

Checksum

Optional checksum

 

 

Terminator

03H

 

 

LRP2000 Passive Reader/Writer

98

Page 103
Image 103
Escort LRP2000 manual ABxF Command 14H Get Memory Status, E1H, F1H