SFG R303A Series, User Manual, Page: 10 / 24

1Ch: wrong notepad page number;
1Dh: fail to operate the communication port;
others: system reserved;
VI Module Instruction System
R303A series provide 23 instructions. Through combination of different instructions, application
program may realize muti finger authentication functions. All commands/data are transferred in
package format. Refer to 5.1 for the detailed information of package.
System-related instructions
Verify passwoard VfyPwd
Description: Verify Module’s handshaking password. (Refer to 4.6 for details)
Input Parameter: PassWord (4 bytes)
Return Parameter: Confirmation code (1 byte)
Instruction code: 13H
Command (or instruction) package format:
2 bytes 4bytes 1 byte 2 bytes 1 byte 4 byte 2 bytes
Header Module
address
Package
identifier
Instruction
code
Password Checksum
0xEF01 xxxx 01H 07H 13H PassWord sum
Acknowledge package format:
2 bytes 4bytes 1 byte 2 bytes 1 byte 2 bytes
Header Module address Package
identifier
Package
Length
Confirmation
code
Checksum
0xEF01 xxxx 07H 03H xxH sum
Note: Confirmation code = 00H: Correct password;
Confirmation code = 01H: error when receiving package;
Confirmation code = 13H: Wrong password;
Set password SetPwd
Description: Set Module’s handshaking password. (Refer to 4.6 for details)
Input Parameter: PassWord (4 bytes)
Return Parameter: Confirmation code (1 byte)
Instruction code: 12H
Command (or instruction) package format:
2 bytes 4bytes 1 byte 2 bytes 1 byte 4 byte 2 bytes
Header Module
address
Package
identifier
Package
length
Instruction
code
Password Checksum
0xEF01 xxxx 01H 07H 12H PassWord sum
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