ADF Web HD67908-5-A1, Руководство пользователя, Страница: 19 / 32

Industrial Electronic Devices
ADFweb.com S.r.l.
User Manual Modbus Slave / HART Master
Document code: MN67908_ENG Revision 1.001 Page 19 of 32
Figure 4: “HART Variables” window
HART VARIABLES:
By Pressing the “ HART Variables ” button from the main window for SW67908 (Fig. 2) the window “Definition of HART Variables List”
appears (Fig. 4).
This section is used to define the HART variables to read/write with the Modbus Master.
The means of the fields are:
If the field “ Enable ” is checked, the HART variable is enabled;
In the field “ Device Address ” the address of HART device is defined;
In the field “ Preamble Count ” the number of bytes for the synchronization is defined;
If the field “ Type ” the type of HART parameter is defined;
In the field “ Var/Cmd Number ” the identification of variable/command to read/write is defined. From HART standard, the most used
numbers are:
o
246: Primary Variable;
o
247: Secondary Variable;
o
248: Tertiary Variable;
o
249: Quaternary Variable.