6
To interface, connect the HART Communicator with the appropriate connectors in parallel
with the instrument or load resistor. All connections are non-polarized (Figure 3).
Figure 3 Communicator Connections
NOTE:
For the HART Communicator to function properly, a minimum of 250 ohms
resistance must be present in the loop. The HART Communicator does not measure loop
current directly.
1.3 Online
First make sure that batteries have been installed properly in the Communicator. Then
press the On/Off Key
to power up the Communicator
（
once again for shut down
）
.
Then for about 5 seconds after the startup, the Communicator will automatically poll the
HART device (polling address 0) in the 4~20mA loop. If a device is not found, the
Communicator will display the message “No device found at address 0, Poll?” If a device
is found, the Communicator will display the Online Menu (Figure 4).
Figure 4 Online Menu
1.4 Common Tasks
1.4.1 Process Variables
When online, follow the below operation to access Process Variables:
Online Menu→1 Process Variables.
1.4.2 PV Unit
When online, follow the below operation to access PV Unit:
Online Menu→4 Detailed Setup→2 Signal Condition→1 PV Unit.
Online (********)
Device Setup
1 Process Variables
2 Diag/Service
3 Basic Setup
4 Detailed Setup
