RFID Communications

6.5.22 ABxF Command 95H: SN Block Read

DESCRIPTION

Command 95H reads a block of data from a specified RFID tag.

DISCUSSION

This command is used to read segments of data from contiguous areas of tag memory. It handles up to

1 kByte of data transferred to the host with one command. The timeout value is given in 1 msec increments and can have a value of 1EH to FFFEH (65,534 ms). When the timeout is set to 0, the controller returns a syntax error. The SN Block Read consists of Family ID, serial number, a start address, and length followed by a timeout value. The eight-byte serial number of the target tag is specified. If the read length exceeds the last tag address, the controller returns an error message in the status byte. It returns a response when done, or when the timeout expires.

Field

Content

Header

0202H

 

 

Command Size

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

 

 

Command

95H

 

 

Family Code

Ignored byte, set to 00H

 

 

Reserved

Ignored byte, set to 00H

 

 

Start Address

2-byte value for the starting tag address

 

 

Number of Bytes

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

 

 

Timeout

Timeout value given in 1 ms units

 

 

Serial Number

Serial number of the tag to be addressed

 

 

Checksum

Optional checksum

 

 

Message Terminator

03H

 

 

119

LRP2000 Passive Reader/Writer

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Escort LRP2000 manual ABxF Command 95H SN Block Read, 119