User Manual

LRP76 Long Range Passive Reader/Writer 17
5
Standard RFID Interface
5.1 Introduction
The LRP76 features RFID commands to perform the reading/writing
of tag data. The standard commands are based on the established
ABx protocol. Table 5-1 lists the standard commands available in the
LRP76.
The LRP76 stores incoming bytes in a buffer and scans for a start
character (AA Hex or <STX><STX>). When a start character is found,
it will check for the terminating character (FFFF Hex or <ETX>).
Having identified a potentially valid command string, the standard
program will check the format of the data and either perform the
requested function or generate an error message.
5.2 Command Timeout Values
Most commands sent to the LRP76 contain a timeout value field. This
is the maximum number of milliseconds that a command will be
attempted. If a command is not successfully completed within this
time interval, a tag search error (08H) will be returned. When a
command is successfully completed, the appropriate command
response will be returned to the host. This will happen in less time
than the timeout period.
Table 5-1: Standard RFID Commands
Command Hex
Equivalent
Command Name
04 Hex Tag Fill
05 Hex RF Port Block Read
06 Hex RF Port Block Write
07 Hex Read Tag Serial Number
08 Hex Tag Search
0D Hex Start/Stop Continuous Block Read
0E Hex Read SN and Data
0F Hex Start/Stop Continuous Read SN and Data