Configuration and Use Manual 31
Connecting with the 275 HART Communicator or 375 Field Communicator
Using the Display Using the CommunicatorUsing ProLink IIBefore You Begin Using the Display Using the CommunicatorUsing ProLink IIBefore You Begin Using the Display Using the CommunicatorUsing ProLink IIBefore You Begin Using the Display Using the CommunicatorUsing ProLink IIBefore You Begin
Note: This procedure allows you to use the device description for the Model 2700 transmitter with the
configurable input/outputs option board. You will not be able to configure the RS-485 parameters
using this device description. To configure the RS-485 parameters, use the 375 Field Communicator
or ProLink II.
4.3 Connecting to a transmitter
You can connect the Communicator directly to the transmitter’s mA/HART
terminals or to a point on a HART network.
Note: If you are using the mA/HART terminals to report a process variable and also
for HART communication, see the transmitter installation manual for wiring
diagrams.
4.3.1 Connecting to communication terminals
To connect the Communicator directly to the transmitter’s mA/HART terminals:
1. If you are connecting to a Model 1700/2700 transmitter, open the cover to the wiring
compartment.
2. Connect the Communicator leads to the transmitter’s primary mA output terminals:
• Model 1700/2700 transmitters: terminals 1 and 2 (see Figure 4-1)
• Model 1500/2500 transmitters: terminals 21 and 22 (see Figure 4-2)
Connecting a HART device to the transmitter’s primary mA output terminals
could cause transmitter output error.
If the primary mA output is being used for flow control, connecting a HART device
to the output loop could cause the transmitter’s 4–20 mA output to change, which
would affect flow control devices.
Set control devices for manual operation before connecting a HART device to the
transmitter’s primary mA output loop.
Opening the wiring compartment in a hazardous area can cause an
explosion.
Because the wiring compartment must be open to make this connection,
connections to the mA terminals should be used only for temporary connections,
for example, for configuration or troubleshooting purposes.
When the transmitter is in an explosive atmosphere, use a different method to
connect to your transmitter.
• Model 1500 AN
• Model 1700 AN
• Model 1700 IS
• Model 2500 CIO
• Model 2700 AN
• Model 2700 IS
• Model 2700 CIO
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