Grow R503, User Manual, Page: 28 / 50

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matching score are 0);
2: The instruction doesn’t affect the contents of the buffers.
Fingerprint image collection extension command GetImageEx(0x28)
Description: Detect the finger, record the fingerprint image and store it in ImageBuffer, return it
and record the successful confirmation code;If no finger is detected, return no finger confirmation
code(the module responds quickly to each instruction,therefore, for continuous detection, cycle
processing is required, which can be limited to the number of cycles or the total time).
Differences between GetImageEx and the GetImage:
GetImage: return the confirmation code 0x00 when the image quality is too bad (image
collection succeeded)
GetImageEx: return the confirmation code 0x07 when the image quality is too bad (poor
collection quality)
Input Parameter: none
Return Parameter: Confirmation code
Instruction code: 0x28
Command (or instruction) package format:
2 bytes 4bytes 1 byte 2 bytes 1 byte 2 bytes
Header Module
address
Package
identifier
Package length Instruction code Checksum
0xEF01 xxxx 0x01 0x0003 0x28 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 0x07 0x0003 X sum
Note 1: Confirmation code=0x00: read success
Confirmation code=0x01: error when receiving package;
Confirmation code=0x02: no fingers on the sensor;
Confirmation code=0x03: unsuccessful entry
Confirmation code=0x07: poor image quality;
Cancel instruction Cancel(0x30)
Description: Cancel instruction
Input Parameter: none
Return Parameter: Confirmation code
Instruction code: 0x30
Command (or instruction) package format:
2 bytes 4bytes 1 byte 2 bytes 1 byte 2 bytes
Header Module
address
Package
identifier
Package length Instruction code Checksum
0xEF01 xxxx 0x01 0x0003 0x30 sum