Honeywell 1900GHD-2 User Manual page 212

C - Compensation
Flattens the image to account for variations in illumination across the
image.
0C Compensation disabled (default)
1C Compensation enabled
Example of Compensation at 0C:
D - Pixel Depth
Indicates the number of bits per pixel in the transmitted image (KIM or BMP
format only).
8D 8 bits per pixel, grayscale image (default)
1D 1 bit per pixel, black and white image
8 - 6
Example of Compensation at 1C: