I can't perform digital output with the MX100/DARWIN API.

For user digital output on the MX100, set the DO module channel to command DO, and send the DO data.

• Set the channel to command DO
  See the setup change function (setDOTypeMX) of the setting function.
  For extended API, see channel settings (setChKindMX100)
• Preparing DO data
  See the setup change functions (changeDODataMX)
  For the extended API, see the data manipulation functions (createDOMX100,changeDOMX100)
• Sending DO data
  See the collective setup change function (setDODataMX) of the setting function
  For the extended API, see the data manipulation functions (commandDOMX100)

Chapters, "Correspondence between Functions and Class/Member Functions" in the user's manual