6M18 Camera User’s Manual
30
DALSA
03-32-10017-03
Table 19: 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):
This mode is the camera’s default. 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.
The camera’s default integration time value is 5 ms which achieve 18 fps.
Example: Set integration time to 1000ms
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
= 1000ms
= 1000000µs
= 0F4240h.
Write Integration LS
Byte
Write Integration
Center Byte
Write Integration
MS Byte
Command
Value
Command
Value
Command
Value
Binary
1000 1010
0100 0000
1000 1011
0100 0010
1000 1100
0000 1111
Hex
8Ah
40h
8Bh
42h
8Ch
0Fh
Programmed Integration/SMA Trigger
For external SMA controlled triggering with a programmed integration time, a TTL rising edge on
the
TRIGGER IN
(or SYNC) signal triggers the camera to acquire one frame of data. Integration
begins within 200ns after the rising edge and stops when the programmed integration time has
completed. After that single frame acquisition, the camera outputs the just acquired frame and “re-
arms”, thus waiting for a new External Trigger signal to trigger a new frame acquisition. The
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