National Instruments FieldPoint FP-1001, User Manual, Page: 21 / 65

Chapter 2 Hardware Installation and Configuration
© National Instruments Corporation 2-11 FP-1000/1001 User Manual
the FP-1000 already has biasing resistors, so you do not need to do anything
when connecting one or more FP-1001 modules to the FP-1000.
Figures 2-13 and 2-14 show typical RS-232 and RS-485 signal connections
and termination for a FieldPoint network. Figure 2-13 is a more detailed
depiction of Figure 2-8, and Figure 2-14 is a more detailed depiction of
Figure 2-10.
Figure 2-13. Typical Signal Connections for Host Computer Connected to One FP-1000
and Multiple FP-1001 Network Modules
Figure 2-14. Typical Signal Connections for Host Computer Connected to Multiple
FP-1001 Network Modules
To Host
Computer’s RS-232
Receive Input
From Host
Computer’s RS-232
Transmit Output
Ground
FP-1001 FP-1001 FP-1000
TX
RX
TX RX
RX TX
Connect the TX outputs of the FP-1001 to the RX inputs of the FP-1000,
and the RX inputs of the FP-1001 to the TX outputs of the FP-1000.
From Host
Computer’s RS-485
Transmit Output Pair (TX)
To Host
Computer’s RS-485
Receive Input Pair (RX)
FP-1001 FP-1001 FP-1001
+
+
–
–
RX TX RX TX RX TX
Connect the TX outputs of the host computer to the RX inputs of the FP-1001,
and the RX inputs of the host computer to the TX outputs of the FP-1001.