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6.4.2. Edge Pre-select Mode
In EPS mode, the trigger leading edge will start an exposure at the first LVAL pulse if LS=0, (or
immediately if LS=1), and it stops and the resulting image is read out after the pre-selected
shutter time. It can be the 10 steps in normal or 1216 steps in programmable. SM=0 or SM=1.
This mode will operate with full and partial scanning.
An EEN pulse will indicate the active accumulation time, and a FVAL pulse indicates that the
resulting video is read out.
To use this mode:
Set function: Trigger mode “Edge Pre-select” TR=1
LVAL synchronous accumulation LS=0, LS=1
Shutter mode “Normal” or “Programmable” SM=0, SM=1
“Shutter Speed” SH=0 through 9
“Programmable exposure” PE=1 through 1216
Scanning format SC=0 through SC=4
Output select OS=0, OS=1
Polarity and other functions
Input: Ext. trigger to Camera Link or pin 10 on 12-pin connector.
Important notes on using this mode.
• The duration of the trigger should be >2LVAL to <3FVAL.
• If LS=0 (Synchronous accumulation), the minimum trigger interval is 1 FVAL + 3 LVAL. The
new exposure should not be finish before the previous frame is read out.
• If LS=1 (Asynchronous accumulation) the minimum trigger interval is the exposure time +
3 LVAL. A new trigger must not be applied before FVAL is low.
• 1LVAL = 47.9 µsec (single). 27.3 µsec (dual).
For horizontal timing refer to 6.2.3 through 6.2.6. (Fig.17. through fig. 20.)
For LVAL synchronous accumulation refer to 6.2.7 and 6.2.8. (Fig. 21. fig. 22.)
L VAL
DA TA OUT
SUB
SG
FVAL
OB
1
Ef f ect i ve Li nes
2L
2345
1
1
9
7
1
1
9
6
1
1
9
8
1
2
0
0
1
1
9
9
1200L
4L
1214L
EEN
Ext.Trig1
4L
Re
ser
ve
d
4L
OB
R
e
serve
d
When t he LVAL Sync Accum. : 1.5L
DVAL
Exposur e
Pe r i o d
When t he LVAL Async Accum.: 0.5 to 1.5L
Fig.24. Edge Pre-select mode vertical timing