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Spyder Expansion
Spyder X20 User Manual 147
020-000916-01 Rev. 1 (04-2016)
Signal Flow
There is always a hierarchy of signal flow through any Spyder System starting upstream with the inputs and
ending with the downstream outputs. Each input (layer) in the system adds its share of pixel information to the
VI and passes it along downstream through the frame(s) starting with the remaining inputs, thru to the outputs,
and out the expansion module port if expansion is used. The first input in a frame is always the first upstream
layer. Refer to the below diagram.
Signal never flows upstream therefore upstream outputs cannot support downstream inputs.
Serial Expansion
Serial expansion is required to increase the total of inputs and outputs (I/O) of a system by using a series of
Spyder Servers. The entire expanded system is still defined within a single Virtual Image (VI) and cannot exceed
that pixel limitation. Although each individual Spyder Server is capable of supporting an entire VI, such as a
standalone 344 model, I/O capacity is limited to the amount of input and output cards that can be mounted in a