Multiple clock sources?

[whatsthis4]

I am currently using the TTL signals from RTSI 0 as my scan clock source. Would it say be possible to use the signal from RTSI 0 AND RTSI 1 (high to low) as my scan clock? (therefore larger scan rate?)

In a related question, does anyone know if it is possible to use the select signal VI with phase A AND phase B as the source to say RTSI 0.

I am quite curious about this

Chris

[rgharrison]

Hi Chris,

I'm not sure if I understand your question but correct me if I'm wrong. When dealing with a clock signal, you can only have 1 source. There is no way to "multiplex" the RTSI lines together to increase the scan rate. So you would have to choose 1 line or the other.

In terms of using the Select Signals Express VI, this is a software signal selector. This VI can not control the hardware signals on the board. The idea behind this VI is that if you have multiple signals coming from a software read, you can use this Express VI to select a subset of these signals. This function is purely selecting signals in software and not the hardware of the board.

I hope that clears things up. Have a good day.

Ron

[whatsthis4]

Thanks for your reply Ron

Since you say there can only be one clock source, I thought another option would be to use the Select Signal VI - the 2nd part of my original question.

I am currently using the falling edge of a TTL signal (eg phase A) on RTSI 0 to clock data. (Routing phase A using software Select signal VI)

My theory was this:

I thought maybe I could route another TTL signal (eg phase B) using another call to the Select Signal VI, leading to an increased scan rate. (phase A and B now BOTH being selected to be routed to RTSI 0 = more falling edges on RTSI 0 per second)

Conversely I thought that another call to this VI might simply overide the last call so that ONLY phase B would now be routed to RTSI 0. (if only one signal was all
owed to be selected per line)

I hope that explains my question a little better


Thanks again

Chris