Hi himi,
In order to source 13.5V and 2A, you will need to cascade two PXI-4110 modules and use an Auxiliary Power Supply. The isolated channels 1 and 2 can only source up to 100mA when using PXI backplane power and therefore you can not reach your desired output off PXI backplane power alone. This is due to per-slot power restrictions of the PXI standard.
The best you can get with one 4110 module is 6V @ 2A or 12V @1a. This can been seen in this tutorial titled "Cascading the Outputs of a DC Power Supply to Extend Voltage and Current Ranges". In figure 2b of that tutorial, you will see how to connect your supply to get up to 20V @ 2A.
Please refer to this document regarding the PXI-4110 Power Supply Architecture for general information regarding protecting IO, supplying aux power, regulation, etc.
I hope this helps!
Micah M.
National Instruments
NIC AE Specialist - Test
