National Instruments FP-1001 - Manual (Page 11)

Chapter 1 FP-1000 and FP-1001 Network Module Overview
FieldPoint FP-1000/FP-1001 User Manual 1-2 © National Instruments Corporation
FP-1001 Connects to RS-485
The FP-1001 FieldPoint network module connects directly to an
RS-485 adapter card that is installed in your host computer. Since
RS-485 is inherently a multidrop network, the FP-1001 does not
provide a separate RS-485 repeater. You can network multiple FP-1001
modules in multidrop fashion.
The FP-1001 communicates over RS-485, utilizing full-duplex mode. It
is optically isolated, which prevents fault coupling between the RS-485
network and the FP-1001.