Specifications

Serial port intercommunication agreement | VI-88TR development handbook
2.1.4 Return packet format with address
BootCode
Length
Command
Address
Return Data
CheckSum
See chart above , return packet is composed of 6 parts:
Length(byte) Description
BootCode 1
When execute command correctly, bootcode of
return packet is F0H. When execute command
fail, bootcode of return packet is F4H.
Length 1
Effective length. The length is total bytes of
lateral 4 parts.
Command 1
Command code, same as received command
code, means that return packet is the reaction
to the command.
Address 1
Reader address, 1 ～
254, 0 and 255 is
broadcast address
Return
Data
uncertain
Return the result of command execution.
Length is changing with command.
CheckSum 1
Checksum, is all bytes from bootcode to
ReturnData, discard patch code.
2.1.5 Error code
When execute command fail, bootcode of return packet is F4H, and
ReturnData is 1 byte of error code. Common error code is:
00(00H)
Command success or detect correct
01(01H) Antenna connection fail
02(02H) Detect no tag
03(03H) illegal tag
04(04H) read write power is inadequate
05(05H)
Write protection in this area
06(06H)
Checksum error
07(07H)
Parameter wrong
08(08H)
Nonexistent data area
09(09H)
Wrong password
10(0AH)
kill password can’t be 0
11(0BH)
When reader in Auto mode, the
command is illegal.
090909RevA|Page 10 of 97