Multidrop Communication - Emerson Rosemount 2051 Reference Manual

Configuration
March 2024
Procedure
1. In the HART tab, use the drop-down menu to select "Burst Mode ON or OFF."
2. After selecting options click Apply.
3. After carefully reading the warning provided, select Yes.
3.12

Multidrop communication

Multidropping transmitters refers to the connection of several transmitters to a single
communications transmission line. Communication between the host and the transmitters
takes place digitally with the analog output of the transmitters deactivated. With smart
communications protocol, up to fifteen transmitters can be connected on a single twisted
pair of wires, or over leased phone lines.
Multidrop installation requires consideration of the update rate necessary from each
transmitter, the combination of transmitter models, and the length of the transmission
line. Communication with transmitters can be accomplished with HART
host implementing HART protocol. Each transmitter is identified by a unique address (1–15)
and responds to the commands defined in the HART protocol. HART Communicators and
AMS Device Manager can test, configure, and format a multidropped transmitter the same
way as a transmitter in a standard point-to-point installation.
Multidrop communication
an installation diagram.
Note
A transmitter in multidrop mode has the analog output fixed at 4 mA. If an LCD display is
installed to a transmitter in multidrop mode, it will alternate the display between "current
fixed" and the specified LCD display output(s).
62
For "Burst option" select the desired properties from the drop-down menu. Burst
options are as follows:
• PV
• % range/current
• Process vars/crnt
• Process variables
shows a typical multidrop network. This figure is not intended as
Reference Manual
00809-0100-4101
modems and a
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