Matlab command to set PFI as Sampleclock on a USB DAQ?

Question

gujax 2023-2-7

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1908420-matlab-command-to-set-pfi-as-sampleclock-on-a-usb-daq

回答： gujax 2023-2-28

Hi,

How do I declare PFI12 for example as sampleclockterminal when PFI0 is declared as sampleclock.source? What is the Matlab syntax for that?I know Labview or NiMax has that option.

Details:

I have a USB 6218 and USB 6366.

Trigger

I am externally triggering using PFI0 terminals in both i.e., signal from a function generator is input to PFI0 of 6218 and PFI0 of 6366

Output

I am deriving 4 analog outputs, two from each for every clock trigger pulse.

These are waveforms going from -10 to +10 V

Question:

However, I also want to output this clock only when DAQ starts its operations to activate another external instrument i.e., it should be a triggered output. Unfortunately, I am not sure how to do that?

Adding triggered digital output port0/line2 does not work because on these devices clocked digital output isn't possible. addoutput(daqObj_1,'Dev2','ao0','Voltage'); %y-direction mirror control addoutput(daqObj_1,'Dev2','ao1','Voltage'); %x-direction mirror control

addoutput(daqObj_1,'Dev2','Port1/Line0','Digital'); %cannot do this for clocked operations

addoutput(daqObj_2,'Dev1','ao0','Voltage'); %y-direction mirror control addoutput(daqObj_2,'Dev1','ao1','Voltage'); %x-direction mirror control

clk1 = addclock(daqObj_1,"ScanClock","External","Dev1/PFI0");

clk2 = addclock(daqObj_2,"ScanClock","External","Dev2/PFI1");

%This statement also does not work clk3 = addclock(daqObj_2,"ScanClock","Dev2/PFI12","External");

Is there a way that I can send the PFI0 input to PFIx output where x is any of amongst 2 to 15?

I tried outputting the PFI10 to 'external' but got an error saying only one clock is allowed. Or is there any other way besides using a third DAQ? Thanks