Escort LRP2000 manual ABxF Command 17H Lock Family Code, ABxF Command 82H Read Data and SN All

RFID Communications

6.5.9 ABxF Command 17H: Lock Family Code

DESCRIPTION:

Command 17H locks the family code byte to its current value, so that it cannot be written. Once locked, the family code cannot be unlocked.

Command from Host

Field	Content
Header	0202H
Command Size	0003H
Command Code	17H
Timeout, 2 seconds	07D0H
Checksum	0EH
Terminator	03H

Response from Controller

Field	Content
Header	0202H
Response Size	0001H
Command Echo	17H
Checksum	E7H
Terminator	03H

6.5.10 ABxF Command 82H: Read Data and SN All

DESCRIPTION

Command 82H reads a block of data from all RFID tags-in-field or all those with the specified family code. Data is returned with the serial number of the corresponding tag.

DISCUSSION

This command is used to read segments of data from contiguous areas of tag memory. It handles up to 1KByte of data transferred to the host with one command. 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. The response to this command contains the serial number of the responding tags preceding the data from those tags. The termination packet is transmitted when the timeout expires. Each packet is sent to the host as soon as it is available. The returned serial numbers can be used to read from or to write to tags-in-field via the SN Block Read or Write commands. The SN Block Read All consists of a header, a family code, a start address and length, followed by a timeout value and the message terminator, 03H, as shown below. A special termination packet is sent when the timeout expires. If the read range exceeds the last tag address, the controller returns an error message in the status byte.

The command is formatted as follows:

Field	Content
Header	0202H
Command Size	Packet length in bytes excluding the header, command size, checksum, and terminator bytes.
Command	82H
Family Code	Tag Family Code - 00H = all tags
Reserved	Ignored byte, set to 00H
Start Address	2-byte value for the starting tag address
Number of Bytes	2-byte value for the number of bytes to be read
Timeout	2-byte value for timeout in 1 ms units (1EH - FFFEH)
Checksum	Optional checksum
Terminator	03H

LRP2000 Passive Reader/Writer 100