Reference Manual

00809-0100-4027, Rev AA

December 2005

3-23

Rosemount 4500

AMS

Right click on the device and select “Configuration Properties” from the menu

1. In the “HART” tab, use the drop down menu to select “Burst Mode ON or

OFF.” 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

2. After selecting options click Apply.

3. An “Apply Parameter Modification” screen appears, enter desired

information and click OK.

4. After carefully reading the warning provided, select OK.

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. 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

Bell 202 modems and a 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 can test,

configure, and format a multidropped transmitter the same way as a

transmitter in a standard point-to-point installation.

Figure 3-3 shows a typical multidrop network. This figure is not intended as an

installation diagram.

NOTE

A transmitter in multidrop mode has the analog output fixed at 4 mA. If a

display is installed to a transmitter in multidrop mode, it will alternate the

display between “current fixed” and the specified meter output(s).

Figure 3-3. Typical Multidrop

Network

Power

Supply

Bell 202

Modem

RS-232-C

4500-05_AA.EPS

1 2 ... 34 35 36 37 38 39 40 41 42 43 44 ... 69 70

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Savin 4027 Specifications Page 39

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