usb 6211 and 6211: problem to run example playrec.py with nidaqmx-python

[ghfresnel]

hello,

i connected the two devices by AO1 on 6212 and AI1 on 6211, and run playrec.py after specifying the correct io:

indata = playrec(
outdata,
samplerate=96000,
input_mapping=["Dev1/ai1"],
output_mapping=["Dev2/ao1"],

but it fails with a error message i don't understand:

    raise DaqWriteError(extended_error_info, error_code, samps_per_chan_written)

DaqWriteError: No registered trigger lines could be found between the devices in the route.
If you have a PXI chassis, identify the chassis correctly in MAX, and make sure it has been configured properly. If you are using PCI devices, make sure they are connected with a RTSI cable and that the RTSI cable is registered in MAX. Otherwise, make sure there is an available trigger line on the trigger bus shared between the devices.

Task Name: _unnamedTask<5>

Status Code: -89125

but it seems that i need to create a RTSI cable with MAX, but i see nothing to create a cable between 2 different devices as in my case, am i right?

initially, my idea was to emit a sine wave on Dev2/AO1 and sample it on Dev1/AI1

Thanks in advance for help,

Gerard

[ft_06]

Hello,

The 2 cards are assumed to be time synced through:

write_task.triggers.start_trigger.cfg_dig_edge_start_trig(
read_task.triggers.start_trigger.term
)

USB devices do not have RTSI but they can do it through PFI as seen in attachment (look for timing input and output in picture)

With RTSI, python code is very easy. For PFI, you may need to be explicit using nidaqmx.task.triggering.Start_trigger.

Do you need to sync the cards ?

[ghfresnel · Accepted solution]

you're right, actually i don't need to sync the cards.

Thanks for your reply,

Gérard