User's Manual

Table Of Contents
ABxF Command 86 (86H): Block Write All
DESCRIPTION
Write a block of data to an RFID tag.
DISCUSSION
The Block Write All command is used to write segments of data to contigu
-
ous areas of tag 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 LRP820 will return a syntax error.
The Block Write All consists of a Family ID, Anticollision Index, a start ad
-
dress followed by the data stream to be written to the RFID tag. If the write
range exceeds the last tag address, the LRP820 will return an invalid format
error message (error code 21H).
The LRP820 will return a response when the timeout expires. If the
Anticollision Index is 0, a response is returned when the operation is suc-
cessfully completed on 1 tag, or when the timeout expires.
Field Content
Header <STX><STX>
Command Size Packet length in bytes excluding the header, command size, checksum and
terminator bytes. 0009H plus the number of data bytes
Command 86H
Family ID Tag Family ID - 00H = all tags
Anticollision Index Number of tags expected
Start Address 2-byte value for the starting tag address
Block Size 2-byte value for the length of the write in number of bytes
Timeout 2-byte value for timeout in 1 ms units. (1EH - FFFEH)
Data Data bytes to be written
Checksum Optional Checksum
Terminator <ETX>
NOTE:
This command can not be used over a MUX32 interface.
Copyright © 2000 Escort Memory Systems
112 LRP820-Series Long-Range Passive Reader/Writer