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Option Description
Secondary
Use this setting if another HART host such as a DCS is on the network.
Primary
Use this setting if no other host is on the network. The Field Communicator is not
a host.
9. Click Connect.
Need help? If an error message appears:
• Verify the HART address of the transmitter.
• Ensure that you have specified the correct COM port.
• Check the physical connection between the PC and the transmitter.
• Ensure that there is no conflict with another HART master.
• For long-distance communication, or if noise from an external source interferes with the
signal, install 120-Ω ½-W terminating resistors in parallel with the output at both ends of
the communication segment.
B.2.5 Make a Modbus/RS-485 connection
You can connect directly to the RS-485 terminals on the transmitter or to any point on the
network.
CAUTION!
If the transmitter is in a hazardous area, do not connect directly to the transmitter terminals.
Connecting directly to the transmitter terminals requires opening the wiring compartment,
and opening the wiring compartment while the transmitter is powered up could cause an
explosion. To connect to the transmitter in a hazardous environment, use a connection
method that does not require opening the wiring compartment.
Prerequisites
• ProLink II installed and licensed on your PC
• One of the following:
- RS-232 to RS-485 signal converter
- USB to RS-485 signal converter
• An available serial port or USB port
• Adapters as required (for example, 9-pin to 25-pin)
Procedure
1.
Attach the signal converter to the serial port or USB port on your PC.
2. To connect directly to the transmitter terminals:
a. Remove the transmitter end-cap to access the wiring compartment.
b. Connect the leads from the signal converter to terminals 5 (RS-485/A) and 6
(RS-485/B).
Using ProLink II with the transmitter
284 Micro Motion
®
Model 2700 Transmitters with Analog Outputs