JAI CV-A11 operation manual External Trigger Modes, Edge Pre-select Mode.TR=1

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CV-A11

6.4. External Trigger Modes

This camera has 6 external asynchronous trigger modes, which can be set by RS-232C commands.

1.

Edge Pre-select Mode.TR=1

Pre-selected exposure. (SM=0, SM=1)

2.Pulse Width Control Mode. TR=2 Pulse width controlled exposure. (HC=0, HC=1)

3.Frame Delay read out mode. TR=3 PWC exposure read out by ext. VD. (HC=0, HC=1)

4.Long Time Exposure Mode. TR=4 Exposure is interval between ext. VD.

5.

Start/stop Mode. TR=5

Exposure start by trigger and stop by ext. VD

6.Smearless Read out mode. TR=6 EPS Exp. after fast dump readout.(SM=0, SM=1)

The default accumulation is HD synchronously accumulation (HC=0). The accumulation starts at the first HD after the trigger leading edge. Details are shown in fig.15.

In PWC mode (TR =2) and Frame Delay readout (TR=3), the accumulation mode HC can be set to asynchronous accumulation (HC=1). The exposure will start immediately at the leading edge of the trigger pulse without waiting for the HD. Fig. 16. below shows the details.

In Edge pre-select TR=1 and smearless TR=6, the shutter mode can be SM=0 or SM=1.

Smearless read out will reduce the smear caused by highlighted zones seen in images taken with a short shutter speed. Before the accumulation can start, a fast dump read out is performed. It takes 28H from trigger leading edge to start of accumulation.

Important notes on using trigger modes

The HD synchronized accumulation starts at the first HD after the trigger leading edge. To avoid the <1H jitter caused by this delay, synchronize the external trigger to HD as shown in fig. 14. The trigger level translations should be placed inside A, which is 8 sec.

Do not input a new trigger before the previous video is read out. (WEN is high).

A=8 µsec

Fig. 14. Trigger/HD timing.

t1

t2

t3

t4

t5

HD

Trigger

Accum

Xsub

Xsg

EEN

Note:

Xsg and Xsub are internal signals in the camera. They are shown in the timing diagram for better understanding.

Fig. 15. Pulse Width H synchronous accumulation.

t1

t2

t3

t4

HD

Trigger

Accum

Xsub

Xsg

EEN

Fig. 16. Pulse Width H asynchronous accumulation.

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Contents CV-A11 CV-A11 Table of ContentsMain Features GeneralStandard Composition Camera Housing and Dimensions Pin Multi-connector DC-IN/VIDEO OUT, EXT.HD/VD Pin Multi-connector Trigger and RS232CPin Assignment Video output Input and Output CircuitsTrigger input HD and VD inputBasic functions Functions and OperationsContinuous Operation Non triggered Input-output of HD/VD SignalsEdge Pre-select Mode.TR=1 External Trigger ModesImportant notes on using this mode Edge Pre-select ModePulse width control Pulse Width Control ModeFrame delay read out Frame-delay read out ModeLong time exposure Long Time Exposure ModeStart/stop mode Start/Stop ModeSmearless mode Smearless ModeReadout format Frame rate Effective lines Partial scan readout modeOther Functions RS-232C control Configuring the CameraUseful commands CV-A11 RS-232C command listCamera Control Tool for CV-A11 Internal Switch and Jumper Settings Selecting termination of HD/VD input signals1. HD/VD input-output selection Spectral Sensitivity SpecificationsWEN out on pin 6 on 6 pin connector AppendixCV-A11 emulating CV-M10 interfacing Typical CCD Characteristics PrecautionsCamera type CV-A11 Revision Revision a Serial No …………… Users Record