RFID Communications

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.

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>

 

 

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.

Command from Host

Field

Content

Header

0202H

 

 

Command Size

0005H

 

 

Command Code

88H

 

 

Family ID

00H

 

 

Reserved

00H

 

 

Timeout

07D0H

 

 

Checksum

99H

 

 

Terminator

03H

 

 

Response from Controller

Field

Content

Header

0202H

 

 

Response Size

0003H

 

 

Command Echo

88H

 

 

Number of Tags

01H

 

 

Status Byte

08H

 

 

Checksum

73H

 

 

Terminators

03H

 

 

LRP2000 Passive Reader/Writer

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Escort LRP2000 manual ABxF Command 88H Tag Search All, Etx