Escort LRP2000 manual ABxF Command 94H SN Fill, 117, Response form Controller Field Content

RFID Communications

Example

This example locks the family code on all tags with the family code of 02H. Two tags are found and locked.

Command from Host

Field	Content
Header	0202H
Command Size	0005H
Command Code	8CH
Family ID	02H
Reserved	00H
Timeout	07D0H
Checksum	95H
Terminator	03H

Response form Controller

Field	Content
Header	0202H
Response Size	0003H
Command Echo	8CH
Number of Tags	02H
Status Byte	08H
Checksum	67H
Terminator	03H

6.5.21 ABxF Command 94H: SN Fill

DESCRIPTION

Command 94H fills only the RFID tag specified by serial number with a one-byte value over multiple contiguous addresses.

DISCUSSION

This command is commonly used to clear an RFID tag's memory. It writes a one-byte value repetitively across a specified range of tag addresses. Only the tag with the specified serial number is affected by this command. The controller returns a response after the successful fill operation, or when the timeout expires. The fill function requires a serial number, one data value byte, a starting address, and a fill length. It fills the specified tag with the data value byte, starting at the specified start address for the specified number of consecutive bytes. When the fill length is set to 0, the controller writes fill data from the start address to the end of the tag's memory. The timeout value is given in 1 msec increments and can have a value of 1EH to FFFEH (65,534 ms). When the timeout is set to 0, the controller returns a syntax error. It returns a response when done or when the timeout expires.

Field	Content
Header	0202H
Command Size	Command length in bytes excluding the header, command size, checksum, and terminator bytes
Command	94H
Family Code	Ignored byte, set to 00H
Reserved	Ignored byte, set to 00H
Start Address	2-byte value for the starting tag address
Number of Bytes	2-byte value for the length of the fill in number of bytes
Timeout	Timeout value given in 1 ms units
Serial Number	Serial number of the tag to be addressed
Data Value	Value to be written to all addressed bytes
Checksum	Optional checksum
Message Terminator	03H

117 LRP2000 Passive Reader/Writer