JAI CV-A50, CV-A60 operation manual External Trigger Modes, Start/stop Mode. TR=5

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CV-A50 / CV-A60

6.4. External Trigger Modes

This camera has 5 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.

3.

Frame Delay read out mode. TR=3

PWC exposure read out by ext. VD.

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

An external trigger pulse initiates the capture (input on pin 11 of the 12-pin Hirose connector or pin 5 of the 6-pin Hirose). The leading edge of the trigger pulse initiates the exposure (this is a falling edge if factory default) and the duration of the pulse governs the exposure (accumulation) time. If the polarity of this pulse is reversed, the camera can be configured to correct for it.

The duration of the external trigger pulse must be greater than 1H. It is recommended to make this longer, typically 9H.

Important notes on using trigger modes:-

The accumulation is HD synchronously accumulation. The accumulation starts at the first HD after the trigger leading edge. Shown in fig. 15. 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 the time A, which is 8 µseconds.

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

A==88µsecµ ec

HD

Trigger

Accum

Xsub

Xsg

EEN

Fig. 14. Trigger/HD timing.

t1

t2

t3

t4

t5

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.

Fig. 16. Ext. HD and ext. VD phase conditions.

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Contents CV-A50 / CV-A60 Table of Contents CV-A50 / CV-A60Main Features GeneralStandard Composition Camera Housing and Dimensions Pin Multi-connector DC-IN/VIDEO OUT, EXT.HD/VD Pin Multi-connector Trigger and RS232CPin Assignment Input and Output Circuits Video outputTrigger input HD and VD inputFunctions and Operations Basic functionsInput-output of HD/VD Signals Continuous Operation Non triggeredCV-A50 / CV-A60 Vertical timing details for interlaced. Ccir Vertical timing details for interlaced. EIA External Trigger Modes Start/stop Mode. TR=5Edge Pre-select Mode Important notes on using this modePulse Width Control Mode Pulse width control CcirPage Long Time Exposure Mode Long time exposure. Field accumulationStart/Stop Mode Start/stop mode. Interlaced with frame accumulationOther Functions Configuring the Camera RS-232C controlCV-A50/60 RS-232C command list Timing and shutter related commandsCamera Control Tool for CV-A50/60 Internal Switch and Jumper Settings Selecting termination of HD/VD input signals1 HD/VD input-output selection Specifications CV-A50C CV-A50E CV-A60C CV-A60ESpectral Sensitivity AppendixCV-A50 or CV-A60 emulating CV-M50 interfacing WEN out on pin 6 on 6 pin connector CV-A50/60 without sync on video outputPrecautions Typical CCD CharacteristicsUsers Record Camera type CV-A50/60