Escort LRP2000 User Manual
RFID Communications
103
LRP2000 Passive Reader/Writer
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.
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