Emerson Process Management IM-106-340 instruction manual Section, Overview

Instruction Manual

IM-106-340, Rev. 4.0 May 2006

Oxymitter 4000

Section 7 HART/AMS

OVERVIEW

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 7-1 HART Communicator Signal Line Connections . . . . . . . page 7-2 HART Communicator PC Connections . . . . . . . . . . . . . . . page 7-2Off-Line and On-Line Operations . . . . . . . . . . . . . . . . . . . page 7-4 Logic I/O Configurations . . . . . . . . . . . . . . . . . . . . . . . . . . page 7-4 HART/AMS Menu Tree . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 7-4 HART Communicator O2 Cal Method . . . . . . . . . . . . . . . . page 7-8 Defining a Timed Calibration via HART . . . . . . . . . . . . . . page 7-9 D/A Trim Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 7-9

The HART Communicator is a handheld communications interface device. It provides a common communications link to all microprocessor-based instru- ments that are HART compatible. The handheld communicator contains an 8 x 21 character liquid crystal display (LCD) and 25 keys. A pocket-sized manual, included with the HART Communicator, details the specific functions of all the keys.

To interface with the Oxymitter 4000, the HART Communicator requires a ter- mination point along the 4-20 mA current loop and a minimum load resistance of 250 ohms between the communicator and the power supply.

The HART Communicator accomplishes its task using a frequency shift key- ing (FSK) technique. With the use of FSK, high-frequency digital communica- tion signals are superimposed on the Oxymitter 4000's 4-20 mA current loop. The HART communicator does not disturb the 4-20 mA signal, since no net energy is added to the loop.

The HART Communicator may be interfaced with a personal computer (PC), providing that special software has been installed. To connect the HART Com- municator to a PC, an interface adapter is required. Refer to the proper HART Communicator documentation in regard to the PC interface option.

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