Specifications

Table Of Contents
Serial port intercommunication agreement | VI-88TR development handbook
2.1.2 Command packet format with address
BootCode
Length
Command
Address
Command Param
CheckSum
See chart above , command packet is composed of 6 parts:
Length(byte) Description
BootCode 1 Fixed to be 40H
Length 1
Effective length. The length is total bytes of
lateral 4 parts
Command 1 Command code
Address 1
Reader address, 1
254, 0 and 255 is
broadcast address
Command
Param
uncertain
Command parameter, length is changing with
command
CheckSum 1
Checksum, is all bytes from bootcode to
command param, discard patch code
2.1.3 Return packet format without address
BootCode Length Command Return Data CheckSum
See chart above, return packet is composed of 5 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 3 parts.
Command 1
Command code, same as received
command code, means that return packet
is the reaction to the command.
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.
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