True, you cannot simulate the SCXI-1600. This means you will not be able to run your code without the hardware. For simulation purposes you can, however, use another device that would function in a similar manner to the SCXI-1600 in terms of triggering, resolution, and sampling rate.
As for the programming, you would use DAQmx as I had mentioned. There are no examples that are specific to the SCXI-1600, but you don't really need them. The SCXI-1600 is fundamentally a data acquisition module that happens to be in a SCXI form factor with a USB connection. As far as your software is concerned you will use DAQmx to read data from it. So, take a look at the DAQmx examples that gather data from data acquisition devices.
Your task will define how many channels you will be reading. Since you are reading a mixture of measurements (temperature, pressure, and possibly just plain voltages) you will need to decide whether to create separate tasks for each of these measurements that are configured to be specific to that measurement type, or to create one task that simply reads all unscaled channel values (i.e. raw voltages) and then you scale the values in your code. If you open the Example Finder and navigate the tree to Hardware Input and Output -> DAQmx -> Analog Measurements you will see categories for the different measurement types. Many of them have graphs.
If you have not already done so, you may want to start here: http://zone.ni.com/devzone/cda/tut/p/id/3116
