If you want to scan fingerprint from DE620 and write the template(Access on Card) with BioStar 2 Device SDK, you need both the Dual Eye SDK and Device SDK. Please contact Dual-i and request to download the SDK package.
We don't have a sample code for DE620 but we do have a similar sample for Biomini with BioStar 2 SDK.
BioMini_BioStar2_Sample_191230_LatestUFScanner.zip - http://gofile.me/471Oh/th6XCtZDu
Some users have asked that they can't write data to smart cards despite successfully integrating the two SDKs. For these people, we've prepared a checklist as below.
1. How to calculate CRC(hdrCRC, cardCRC)
The crc (hdrCRC, cardCRC) portion of the Access on Card data must exactly match the calculated value for the card to be recognized as an Access on Card. Please note that CRC should be calculated based on valid data only. For example, even if you assigned maximum size for template data(384*2 bytes), this doesn't mean that you need to calculate 384*2 always.
Please see if your CRC checksum(BS2_ComputeCRC16CCITT) is correct. You can see the sample code for CRC calculation in the "CardControl.cs"
2. Information of CIS
5. Secure Credential Card(SC card) needs to specify BS2CSNCard.data correctly.
In case of Secure Credential Card(SCC), users need to have card information which includes Card ID(24byte), issueCount(4byte) and TimeStamp(4byte). Also, cardObjs array of BS2UserBlob structure should be filled for SCC cards and the user should be updated after SCC issuing.