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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

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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