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LRP2000 Passive Reader/Writer
70
6.4.11 ABxS 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. If the read length is zero (0), then only the tag's serial number is read. While in this mode, any
other command can be issued and will be handled properly. After processing the new command, the
controller resumes the continuous read. Continuous SN Read All is started or stopped by the start/stop
byte in the command. A one (1) in the Start/Stop byte starts the continuous read and a zero (0) stops
continuous read. The command has a parameter, Repeat Count, that can prevent 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, where 0 means the tag can be re-read anytime. When Start/
Stop Continuous SN Read All is interrupted with any other command, the repeat count is stopped during
execution of the other commands and then resumed. The Reader/Writer responds with an acknowledge
packet followed by data packets for each tag read.
Example
This example starts a continuous read of three bytes starting at address two, has a repeat count of four,
and a family code of zero.
After the controller sends the acknowledgement, it sends the data read from the tags in the field.
Field Remarks
Command Command number in hex preceded by AAH
Family ID Tag Family ID - 00H = all tags
Reserved 00H
Start Address Tag address for the start of the read
Read Length One word for the number of bytes to be read.
Repeat Count Number of tag that must be read before the same tag will be read again (0-255)
Start/Stop 0001H to start, 0000H to stop
Message Terminator FFFFH
Command from Host Response from Controller
MSB LSB Remarks MSB LSB Remarks
AAH 83H Perform Command 83 AAH 83H Command Echo
00H 00H Tag Family 00/Reserved Byte FFH FFH Message Terminator
00H 02H Start Address
00H 03H Read Length of the data bytes
00H 04H Repeat count
00H 01H Stop/Start continuous read. This is to Start
FFH FFH Message Terminator
MSB LSB Remarks
AAH 83H Command Echo
00H 1EH Serial Number byte /Tag 1
00H 94H Serial Number byte /Tag 1
00H 0BH Serial Number byte /Tag 1
00H 01H Serial Number byte /Tag 1