Hart® - communication, 1 general, Hart – Yokogawa RAMC User Manual

Page 49: Communication -1, 1 general -1, Communication

<7. HART-COMMUNICATION>

7-1

IM 01R01B02-00E-E 10th edition January 01, 2013 -00

The HART

-Communication is only available for 2-wire units, 4 ... 20mA. Therefore the short-circuit bridge must

be connected between ´ A ´ and ´-´.

7. HART

- Communication

7.1 General

RAMC with indication unit type -H have, additional to the current output, the possibility for HART

Communication. Also without HART

- Communication the units are fully able to work. The HART

Communication does not influence the current output, except in Multidrop-Mode (see below).

There exists no difference between the not-Ex and the Ex versions. For use in the hazardous area a HART

-able

transmitter power supply is required.

Single-Mode :
The poll address must be zero in Single-Mode.

Multidrop-Betrieb :

In Multidrop-Mode maximum 15 HART

- units can be connected parallel. Therefore the poll-address must be

differnt from zero. The current output is switched to 4mA and there are all functions of the unit available.

The HART

-Communication is only available with plugged calibration-EEPROM

NOTE

Deviations in the RAMC- Menu

In HART

devices the operating menu according chapter 6 is not available.

Pressing the ↑ -button the indication can be changed between flow, totalizer and temperature.
Factory default is totalizer.
Pressing → button an error indication appears on display.
00000000 or 00000000
A detailed explanation see chapter 7.4.2