CV-M2
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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.)
LVAL
DATA OUT
SUB
SG
FVAL
OB
1
Eff ect ive Li nes
2L
2345
1197
1196
1198
1200
1199
1200L 4L
1214L
EEN
Ext.Trig1
4L
Reserved
4L
OB
R
eserved
When t he LVAL Sync Accum. : 1.5L
DVAL
Exposure
Per i o d
When the LVAL Async Accum.: 0.5 to 1.5L
Fig.24. Edge Pre-select mode vertical timing