Yokogawa RAMC - Manual (Page 49)

<7. HART-COMMUNICATION>
7-1
IM 01R01B02-00E-E 10th edition January 01, 2013 -00 All Rights Reserved. Copyright © 2003, Rota Yokogawa
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
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