I'm considering using PXIe-2543 as a switch. I have 4 inputs and need one output. Here're two conditions I would like this switch satisfy.
Basically I'd like to know whether each port can be switched between connected and open(not 50OHm termination) and whether I'm able to disconnect all ports.
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Your requirement #1 cannot be satisfied but #2 is possible. You would need to take control of each relay to achieve the results.
As per the manual, this is the simplified schematic of relay connections. You can come up with a lookup table of relay states to achieve your end results.
Yes, you can control individual relays using soft panel