Deterministic Serial communication

[K_seeker]

I need to fire 22 bytes of Data on Rs232 Bus determinstically 120 times a second. What's the bext way to do it with NI based hardware?

Thanks for any input.

[nayer]

Hey,
I have couple of questions first one is on what operating system will be using? and secondly how accurate you want this task to be done?
Regards,
Nikhil A.

[K_seeker]

Nikhil,

I prefer Win XP (non RT) If I can afford to other wise I may have to go with PXI RT controller.

I am not sure about the acceptable jitter. My guess right now is 1/2 msec.

Thanks.

[nayer]

Hey,
Generally Win XP will have jitter of about 10 ms, hence you have to use real-time OS, another thing is that serial communication by itself is not deterministic as there is no hardware trigger hence you have to control timing in the software inorder to get the deterministic output.
Thanks
Nikhil A.