Emerson Oxymitter 4000 Specifications download pdf (Page 121)

IB-106-340

7-1

SECTION VII. HART/AMS

7-1. OVERVIEW.

The HART Communicator is a

handheld communications interface device. It provides

a common communications link to all microprocessor-

based instruments that are HART compatible. The

handheld communicator contains an 8

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 termination 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 keying (FSK) technique.

With the use of FSK, high-frequency digital

communication signals are superimposed on the

4-20 mA Oxymitter 4000 current loop. The

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 special software has

been installed. To connect the HART Communicator

to a PC, an interface adapter is required. Refer to the

proper HART Communicator documentation in regard

to the PC interface option.

7-2. HART COMMUNICATOR SIGNAL LINE

CONNECTIONS.

The HART Communicator can

connect to the Oxymitter 4000 analog output signal line

at any wiring termination in the 4-20 mA current loop.

There are two methods of connecting the HART

Communicator to the signal line. For applications in

which the signal line has a load resistance of 250 ohms

or more, refer to method 1. For applications in which

the signal line load resistance is less than 250 ohms,

refer to method 2.

LOOP CONNECTORS

USE INTERFACE

00275 0013 ONLY

SERIAL PORT & BATTERY

CHARGER MUST

NOT BE USED IN

HAZARDOUS AREAS

SERIAL PORT

AC L1

AC N

4-20

TERMINAL BLOCK

LOOP CONNECTORS

4-20 mA SIGNAL LINE

HART

COMMUNICATOR

RL 250≥Ω

ANALOG OUTPUT DEVICE

LEAD SET

HART COMMUNICATOR

REAR PANEL

23230001

Figure 7-1. Signal Line Connections, > 250 Ohms Lead Resistance

1 2 ... 116 117 118 119 120 121 122 123 124 125 126 ... 145 146

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Emerson Oxymitter 4000 Specifications Page 121

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