User`s manual

Smart Features

6-16 BASLER A620

DRAFT

6.7.5 CRC Checksum

The CRC (Cyclic Redundancy Check) Checksum feature adds a chunk to each image frame

containing a 16 bit CRC checksum calculated using the Z-modem method. The CRC Checksum

chunk is always the last chunk added to the image data stream and the chunk is always 32 bits in

size. As shown in Figure 6-2, the checksum is calculated using all of the image data and all of the

appended chunks except for the checksum itself.

Figure 6-2: Data Used for the Checksum Calculation

Control and Status Register for the CRC Checksum Feature

The extended data stream feature (see Section 6.7.1) must be enabled in order to

use the CRC Checksum feature or any of the other smart feature that adds informa-

tion to the image data stream. Disabling the extended data stream feature switches

off all smart features that add information to the image data stream.

The CRC Checksum feature will only work when the camera is set for video Format 7.

The data transmission method used on A620

f cameras is extremely reliable. The

CRC Checksum feature is included on the camera because CRC checksums are so

commonly used with data transmission applications.

Address: See “Determining the Address of Smart Features CSRs” on page 6-4.

CSR GUID: 3B34004E - 1B84 - 11D8 - 83B3 - 00105A5BAE55

Field Bit Description

Presence Inq

(Read only)

0 Presence of this feature

0: Not Available 1: Available

---- 1 ... 30 Reserved

Enable

(Read / write)

31 Enable / Disable this feature

0: Disable 1: Enable