Emerson Network Router Instrukcja Użytkownika Strona 21

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Installation and Use Manual 15
Installation and Setup
ProLink II Setup Transmitter StartupUsing ProLink IIBefore You Begin
Figure 2-7 Modbus/RS-485 connection to transmitter or multidrop network
DCS or
PLC
R1
Attach serial port or USB
adapter if necessary (not
shown)
RS-485 terminals
Transmitter
RS-232 <-> 2-wire RS-485
interface converter
Notes:
Connect the interface leads to the RS-485 terminals on the transmitter, or to any point on the network.
Ensure that no other Modbus master devices are currently active on the network.
For RFT9712 transmitters, set the jumper for RS-485 communications.
For long-distance communication, or if noise from an external source interferes with the signal, add two 120-Ω
terminating resistors (R1) at each end of the RS-485 network.
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