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On NI-9871 4-Port, RS485/RS422 Serial Module, is the COM signal of each port (table 1 of Getting Started Guide) internaly connected to the COM signal of the Four-Position External Power Connector (Figure 1 of Getting Started Guide)?
Getting Started Guide: https://www.ni.com/pdf/manuals/372277h.pdf
Go to Solution.
I checked by myself:
Yes, all COM are connected together.
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