User's Manual

COBALT UHF-SERIES CHAPTER 5: COMMAND PROTOCOLS
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When a command is issued by the host, the RFID controller stores the incoming data
packet in a buffer while it scans the data for a start character (0x02, 0x02 or 0xAA).
When a start character is found, it checks for the proper terminator (0x03 or 0xFF,
0xFF). Having identified a potentially valid command string, the controller will verify
the format of the data and either perform the requested function or generate an error
message.
5.3.3 ABx Response Packet Structure
After completing an ABx command, the RFID controller generates a host-bound,
response packet that indicates the status and/or results of the attempted command.
The response packet structure for all ABx protocols consists of a Response Header,
a Command Echo, one or more Response Values (when applicable), and a
Response Terminator.
Response Packet Structure = [Response Header + Command Echo + Response
Values + Response Terminator]
Note that, for each ABx protocol, response header and response terminator
parameters are the same as their command header and command terminator
counterparts.
ATTENTION: This Cobalt UHF Series Manual does NOT contain descriptions or
examples of each supported RFID command common to all the devices in the Cobalt
family. For complete details regarding the use of common RFID commands please visit
www.ems-rfid.com and download the ABx Standard Command Protocol – Reference
Manual or the ABx Fast Command Protocol – Reference Manual. Here you will find
only the commands that are specific to the UHF controller.