Essel Technology RFID A1, User Manual, Page: 15 / 60

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3.3.1 Result Register
The Result Register is 1-byte long, with located at address 0x0000, with both read and write access. Writing to this
register has no effect. The register contains the result (error code) of the last executed command. The list of all
possible results is shown in Table 3.2.
Table 3.2
Value Type Description
0x00 No Error
Command was executed successfully and results were
stored in the registers.
0x01 Invalid Command Value written to command register is invalid.
0x02 Invalid Command Parameter
One of the parameters taken by the command is
invalid.
0x03 Indexes Out Of Range Indexes passed as command parameters exceed limit.
0x04
Error When Writing To Non
Volatile Memory
There was an internal error during writing to the non-
volatile memory.
0x05 System Error Internal system error. Shall be considered as fatal.
0x06 Tag CRC Error
During communication with the tag a CRC was not
correct.
0x07 Tag Collision Reserved for future use.
0x08 Tag is not present There is no tag within range.
0x09 Tag Authentication Error
Authentication failed due to incorrect Autentication
Key or Password.
0x0A Tag Value Block Corrupted
At least one value block is corrupted in the tag
memory.
0x0B Module Overheated A overheat was detected.
0x0C Tag Not Supported There is a tag in the field which is not supported.
0x0D Tag Communication Error There was an error during communication with the tag.
0x0E Invalid Password
The Password used in the Unlock command string was
invalid.
0x0F Already Locked You are trying to lock a module that is already locked.
0xFF Module Busy
Your command was ignored because the module is
busy. Retry later.
Result Register Values