Dalsa DALSTAR 4M30, User'S Manual And Reference

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4M30 Camera User’s Manual 24
DALSA 03-32-10030-04
Example: Set Channel 1 to 2.5x Gain
Use these command/value pairs set the camera to 2.5x gain (you must write both MSB and LSB
values to all four ADC channels).
Value
≅
27306
×
log
10
(2.5)
Value = 10866
= 2A72h
Write MSB Write LSB
Command Value Command Value
Binary 0000 0110 0010 1010 0000 0101 0111 0010
Hex 06h 2Ah 05h 72h
Reading Channel 3 Gain from the Camera
To read the gain setting from the camera, use these commands:
Read
MSB Read LSB
Binary 0110 0110 0110 0101
Hex 66h 65h
3.10 Adjusting User Offset
User offset is adjustable from minus full scale to plus full scale (±4095) by a 16 bit value as an MS
and LS byte (only the 14 most significant bits of this value are actually used). There are 4 ADC
video boards in the 4M30 and each can be controlled independently. Normally, the same value will
be written to all four channels. The value is calculated according to the following equation:
Value ≅ 218 × Offset/Gain
Where Offset is in counts and –4095
≤
Offset
≤
4095
And 1 ≤ Gain ≤ 10 and is defined as above.
This means that the offset is dependent on the gain and can be adjusted with a resolution of 0.5 x
Gain (in DN counts).
Example: Set Channel 2 to 20 DN Offset @ 2.5x Gain
Use these command/value pairs set the camera to an offset of 20 DN at a gain of 2.5 (you must
write both MSB and LSB values).
Value
≅
218
×
20/2.5
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