How to release 8 channels occupied by SCXI-1125?

[ClaudeWang]

Hi,

We just bought a SCXI-1125 for data acquisition with PCI-6251 card. However, although PCI-6251 has 16 AI channels, they are all occupied by SCXI-1125 for 8 MCH+ and 8 MCH- as the differential mode. Could it be possible to make SCXI-1125 run as NRSE mode and release those 8 MCH- channels for my DAQ card to connect to other signal sources? Thanks.

Claude.

[Nick_CH]

Dear ClaudeWang,

Thanks for you question and it is not possible to modify the input configuration of the connection between the SCXI-1125 and the PCI-6251.
That means that the 16 inputs of the device are used for the communication. This is explained in the SCXI-1125 User Manual and Specifications on page D-2

Can I use the unused analog input channels of the DAQ device if I am directly cabled to the SCXI-1125?
It depends. The SCXI-1125 always outputs channels 1 through 7 to the rear signal connector to permit parallel mode scanning. If you are using a
16-channel (8 differential inputs) DAQ device, all DAQ channels are unusable for general-purpose analog input. If you have a module in your
chassis that does not have parallel mode, connect the DAQ device to it and use a breakout connector to connect to the unused channels on the DAQ
device. If you are directly connected to a higher input channel device, such as a 64-channel (32 differential inputs) DAQ device, only the lower eight
differential inputs are unusable.

Best regards
Nick_CH

[ClaudeWang]

OK, Thanks for your reply. 🙂

Best,

Claude.