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NI-9871 COM signal internal connection

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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

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Accepted by topic author ma.sav

I checked by myself:

Yes, all COM are connected together.

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