96
Reference Manual
00809-0100-4026, Rev KC
Operation and Maintenance
October 2018
Operation and Maintenance
Note
Take the following into consideration if there are multiple Rosemount 5400 Modbus units on the bus:
By default, the transmitters have HART address 1. It will not be possible to establish communication on
HART address 1 if several transmitters have the same address. In this case, there are alternative solutions
to establish communication:
1. Select the Scan by Tag option in the Search Device window in RRM and enter the HART Device Tag of
the transmitter. Communication can now be established with an individual transmitter even if several
devices have the same HART address.
2. Make sure the Rosemount 5400 is alone on bus. Disconnect or turn off power from any other devices.
4.12.2 Connect to the HART terminals
To configure the Rosemount 5400, connect the communicator or PC to the HART terminals using a
HART modem, see Figure 4-14 on page 90. Both the configuration tool and the RS-485 bus can be
connected simultaneously. Configuration data is sent with HART commands through the HMC to the
Rosemount 5400 electronics.
Note that the power supply must be connected during configuration, see also “Connecting the
transmitter” on page 75.
Note
Measurement data is not updated to the Modbus Master when a configuration tool is connected.
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