How can I make the timing of trigger mode 0 in LightCrafter 4500?

Hello RY,

Please allow a few extra days to respond to your question due to the holiday.

Thanks,

Eric

Hello RY,

The problem is with you settings, Internal Trigger (us) Setting is set to 10000us.

As per your GUI snapshot setting, what it means is that, each pattern is exposed for 2000us and total pattern period is 10000us. Since your incoming VSYNC period is only 16667us, it would lead to pattern not displaying properly.

So, you can set something like this, Pattern Exposure - 2000us and Internal Trigger Period - 2500us then run the sequence, you should see all the patterns. 

The KEY to configuration is what is incoming period (in us) and how time is spent in total to display the patterns. By rule the total time spent in displaying a pattern(s) must be <= VSYNC period.

Regards,

Sanjeev

Sanjeev-san,

Happy New Year!
Thank you so much for prompt reply.

I could see all the patterns followed your advise.
But, SeqAbort error occurs in this configuration.

May I ask again?

- Can I ignore this error or not?

- Could you tell me the detail of Sequencer Abort? When does it happen?

Best regards, RY

Sanjeev-san,
Thanks.

a)
Although SeqAbort disappeared under following configuration, 1 pattern is displayed per each vsync.
Internal Trigger : 2230us
Pattern Exposure : 2000us
Vsync Period : 16667us

b)
In our exam, SeqAbort disappeared and 3 patterns are displayed per each vsync under following configuration.
Internal Trigger : 2000us
Pattern Exposure : 2000us
Vsync Period : 16667us

I am confusing.
Can you explain the mechanism of Internal Trigger and Pattern Exposure?

Best regards, RY

Sanjeev-san,

Thanks a lot.
I have a additional question to confirm my understanding is correct or not.
Could you give your comment again?

I would like to achieve following use case:
Use case 1)
- Bit depth : 6bit
- Display 4 patterns in each Vsync

Q1. Vsync period must be more than total pattens display period.
Vsync Period > 4 internal triggers in our use case
Is that correct?

Q2. I would like to configure:
Internal Trigger - Patten Exposure > 230usec
(e.g. Internal Trigger = 5000usec, Pattern Exposure = 2500usec)
It looks like LCr4500 operate correctly except sequence abort happened.
But, we must not ignore the Seq Abort status. Is that correct?

Q3. Do you have any method to configure?
Internal Trigger - Pattern Exposure > 230usec

Best regards, RY

Sanjeev-san,
Thanks very much!!
Best regards, RY

Hello,Please tell me a little more

>UseCase - bit-depth = 6 and 4 Patterns per VSYNC,
>For example 60Hz - 16667us, the maximum pattern exposure time you can get is 16667 / 4 = 4166.75 - 230 = 3936us

ThisCase
maximum setting：3936us
minimum setting：2500us(6bit/400Hz)

So setable range: Pattern Exposure = Internal Trigger = 2500～3936us

Is that correct?

For, Trigger Mode - 0:

Pattern Exposure: The duration the pattern is exposed.

Internal Trigger: This can be called as total pattern period. 

When you set Internal Trigger = 2500 means, as per your settings, the pattern is exposed for 2000us then remaining 500us it is not a dark time.

But, for Trigger Mode = 0, it is mandatory to set Pattern Exposure = Internal Trigger time, 

for example, if you set Pattern Exposure = Internal Trigger = 2000us Plus you select Clear DMD after exposure, then Pattern is displayed for 2000us then there is dark time or blank time of 230us that comes from the Clear DMD after exposure option.

Regards,

Sanjeev

I think you can use shared exposure in Trigger Mode = 0 as long as you keep the Pattern Exposure = Internal trigger time.

Regards,

Sanjeev