Limitations of the Mathcad Data Acquisition Control

  1. The control uses the default settings for the active device, that is, input polarity and range and the input mode (referenced single ended, non-referenced single ended, or differential). To configure the default setting for the devices installed on your computer, use the National Instruments Measurement & Automation Explorer.

  2. The use of AMUX-64T multiplexer devices is not supported at this time.

  3. Before you can access data members of the Channels collection, you must set the ChannelString property.

  4. The analog channel used for analog triggering is always the first channel in the channel string. If you edit the channel string, the order that the channels appear in the Channels collection may not agree with what is typed (for example, if the channel string was 1:3 and then you edited it to be 0,1,2,3 channel zero would be added to the end of the channels collection and would actually be the fourth item in the collection). To clear the channel string, set it equal to a blank string and then specify a new channel string. Doing so places members into the Channels collection in the order that they appear in the ChannelString.

  5. The values you receive from and send to the active device are in volts.

  6. The control does not implement all possible functions as it is intended to be used with Mathcad. For example, there is no wait for trigger feature for analog output because it is assumed that the results of a Mathcad calculation will trigger the analog output operation.