User's Manual

Product Manual - RFID Reader UF70 Certum 42
Chapter 7
Operation
Message structure The message contains a command, a target and source address, the number of
the antenna port (Head) and the actual information. The number of the antenna
port is not required for all messages.
Command ASCII characters (see section  Commands of protocol)
Address Target or source address; ASCII characters '0'...’E’
*)
Head Optional – for messages that refer to a specific
antenna port
Information Depends on the command (includes none, one or more
ASCII characters '0'...'F')
*) The device is pre-configured with an address of '0' on delivery.
End of package The end of the package includes an end (1 character) and the checksum (4
characters)
End End character ASCII character no. 13 (hexadecimal 0D)
Checksum 1 High-byte – XOR logic for all data
(package header, message and end character); ASCII ‘0’..’F’
Checksum 2 Low byte – XOR logic for all data
(package header, message and end character); ASCII ‘0’..’F’
Checksum 3 High byte – addition of all data
(package header, message and end character); ASCII ‘0’..’F’
Checksum 4 Low byte – addition of all data
(package header, message and end character); ASCII ‘0’..’F’
Message
Command Address Head Information
End of package
End Checksum
1
Checksum
2
Checksum
3
Checksum
4