4M30 Camera User’s Manual
27
DALSA
03-32-10030-04
•
External Integration/Serial Trigger:
The camera will integrate as long as the Serial Trigger
signal is held high. The integration time is effectively the input pulse width. In this mode, the
serial signal also controls the frame rate. Due to variation in the host operating system, this
mode is generally used only for camera setup and functional testing.
The register settings required for each mode are defined in Table 17: Integration/Trigger Modes.
Table 17: Integration/Trigger Modes
Mode
Control Register
Bit [7]
INTEGRATE
Control Register
Bit [3]
EXT Trigger
Programmed Integration/Free Running
0
0
Programmed Integration/SMA Trigger
0
1
Programmed Integration/Serial Trigger
0
1
External Integration/SMA Trigger
1
1
External Integration/Serial Trigger
1
1
Whenever the Integrate Mode or External Trigger Mode bits are set the
MODE
LED on the right
side of the rear cover will light to indicate that an externally synchronized mode is active.
Free Running (Programmed Integration):
The camera speed is controlled by writing a 3-byte integration time value (in µs) to the three
Integration Time registers. These three bytes are then combined to form a 24 bit integration time.
The number represents the integer number of microseconds the camera will collect light. The
number programmed in the three registers should not be below 10
µ
S (0000Ah). The camera will
run at maximum speed for the programmed integration time.
Example: Set integration time to 10ms
With an internal integration time of 10 ms, the camera will operate at 23.6 fps.
1/Frame Rate = 10 ms + 32.35 ms
= 42.35 ms
1.
Using the command 82h, set bit [7] of the data byte to 0 (Integration Mode = Internal) and bit
[3] of the data byte to 0 (Trigger Mode = Internal).
NOTE:
All bits within the register are written at one time. Ensure the correct value for all bits
are used when changing camera modes.
2.
Use commands 8Ah, 8Bh, 8Ch to set the 24-bit integration time value.
Value
= 10 ms
= 10000 µs
= 002710h
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