JAI CV-A1 operation manual External Trigger Modes, Edge Pre-select Mode.TR=1

CV-A1

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 Pre-sel. exp. after dummy 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. Fig. 18. To avoid the <1H jitter caused by this delay, synchronize the external trigger to HD as shown in fig. 17 below. The trigger level translations should be placed inside the 8 + 4 ∝seconds.

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. 19. below.

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

8∝ s 4∝ s 8∝ s 4∝ s

Ext. HD

TRIG

>1H

Fig. 17. Trigger/HD Timing.

t1 t2 t3 t4 t5

HD

Trigger

Accum

Xsub

Xsg

EEN

Fig.18. Pulse Width H Synchronous Accumulation

t1 t2 t3 t4

HD

Trigger

Accum

Xsub

Xsg

EEN

Fig. 19. Pulse Width H Asynchronous Accumulation.

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

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