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LRP2000 Passive Reader/Writer
112
6.5.16 ABxF Command 88H: Tag Search All
DESCRIPTION
Command 88H searches for tags within range of the antenna.
DISCUSSION
This command activates the controller to look for tags within range of the antenna. As soon as the
controller finds a tag, it returns a command echo to the host. The timeout value is given in 1 msec
increments and can have a value of 1EH to FFFEH (65,534 ms). If no tag is present, it returns an error
message. See Section 6.6 for information on the error messages.
Example
Checks for the presence of an RFID tag within range of the antenna. A timeout of 2 seconds (07D0H =
2000 x 1 msec increments) is set for the completion of the Tag Search All. In this example, a tag is found.
Field Content
Header 0202H
Command Size Packet length in bytes excluding the header, command size, checksum, and terminator bytes.
0005H for this command
Command 88H
Family ID Tag Family ID - 00H = all tags
Reserved Ignored byte, set to 00H
Timeout 2-byte value for the time in 1 ms units (1EH - FFFEH)
Checksum Optional checksum
Terminator <ETX>
Command from Host Response from Controller
Field Content Field Content
Header 0202H Header 0202H
Command Size 0005H Response Size 0003H
Command Code 88H Command Echo 88H
Family ID 00H Number of Tags 01H
Reserved 00H Status Byte 08H
Timeout 07D0H Checksum 73H
Checksum 99H Terminators 03H
Terminator 03H