RFID Communications

6.5.11 ABxF Command 83H: Start/Stop Continuous SN Read All

DESCRIPTION

Command 83H starts and stops continuous read all mode for multiple tags. It reads the serial number and tag data. While in this mode, any other command can be issued and it will be handled properly. After processing the interrupting command, the controller resumes the continuous read. Continuous SN Read All is started or stopped through a unique parameter, Start Continuous Read. This parameter is set to 01H to initiate the Continuous Read, and set to zero to stop it. The command uses the parameter Tag Repeat Count to limit multiple reads of the same tag. A tag is not read a second time until this specified number of tags have been read since it was last read. Allowed values are from 0 to 255 (FFH), where 0 means the tag can be reread anytime. When Start/Stop Continuous SN Read All is interrupted with another command, the repeat count is saved during execution of the other commands, allowing any tag to be addressed by the interrupting command. Upon completion of the interrupting command, the value of the Tag Repeat Count is restored. The Reader/Writer responds after receipt of the command with an acknowledge packet. This is followed by data packets for each tag read.

Field

Content

Header

0202H

 

 

Command Size

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

 

 

Command

83H

 

 

Family Code

Tag Family Code - 00H = all tags

 

 

Reserved

Ignored byte, set to 00H

 

 

Start Address

2-byte address for the first byte to be read.

 

 

Number of Bytes

Number of bytes to be read from the tag.

 

 

Tag Repeat Count

Number of tags to be read before data is returned twice from any individual tag

 

 

Start/Stop Continuous Read

01H to start continuous read, 00H to stop

 

 

Checksum

Optional checksum

 

 

Message Terminator

03H

 

 

103

LRP2000 Passive Reader/Writer

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Escort LRP2000 manual ABxF Command 83H Start/Stop Continuous SN Read All, 103