Hi Proffesional,
The maximum output rate for the NI 9263 is 100,000 Samples per second. The outputs of this module are updated simultaneously so you can update all 4 channels at this speed. This information can be found on the NI 9263 product page linked below.
NI 9263I'm not sure what you mean by "Back plane Multiplexing". Can you provide any more details or a specific error code you are getting?
Hope this helps
Thanks,
Nathan
Nathan
NI Chief Hardware Engineer