Waveshare UART Fingerprint Sensor, Руководство пользователя

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UART Fingerprint Sensor (C)
V1.0 www.waveshare.com 12 / 18
Byte 1 2 3 4 5 6 7 8
CMD 0xF5 0x2B 0 0 0 0 CHK 0xF5
ACK Format
：
1
）
Data head
：
Byte 1 2 3 4 5 6 7 8
ACK 0xF5 0x2B Hi(Len) Low(Len)
ACK_SUCCUSS
ACK_FAIL
0 CHK 0xF5
2
）
Data packet
Byte 1 2 3 4---Len+1 Len+2 Len+3
ACK 0xF5
User ID
(High 8 Bit)
User ID
(Low 8 Bit)
User information (User
ID and permission
）
CHK 0xF5
Notes
：
Data length of Data packet (Len) is ” 3*User ID+2 ”
User information Format
：
Byte 4 5 6 7 8 9 …
Data
User ID1
(High 8 Bit )
User ID1
(Low 8 Bit )
User 1
Permission
(1/2/3)
User ID2
(High 8 Bit )
User ID2
(Low 8 Bit )
User 2
Permission
(1/2/3)
…
22. Set/Query fingerprint capture timeout
（
CMD/ACK both 8 Byte
）
Byte 1 2 3 4 5 6 7 8
CMD 0xF5 0x2E 0
Byte5=0: timeout
Byte5=1: 0
0
：
Set timeout
1
：
query timeout
0 CHK 0xF5
ACK 0xF5 0x2E 0 timeout
ACK_SUCCUSS
ACK_FAIL
0 CHK 0xF5
Notes
：
Range of fingerprint waiting timeout (tout) value is 0-255. If the value is 0, the fingerprint
acquisition process will keep continue if no fingerprints press on; If the value is not 0, the system will
exist for reason of timeout if no fingerprints press on in time tout * T0.
Note: T0 is the time required for collecting/processing an image, usually 0.2- 0.3 s.