How to access OUTPUT variables from Stored Procedure called by dbxquery?

[plaxosi]

I am calling a Stored Procedure in MS SQL using dbxquery:

The Stored Procedure is configured with:

EXECUTE @RC = [dbo].[getSomeData]
   @time
  ,@interval
  ,@retVal OUTPUT
  ,@retErrorMessage OUTPUT
GO

Am I able to access the values returned in the OUTPUT variables, i.e. retVal and retErrorMessage, from the stored procedure?

All help and insight is appreciated.

Thanks