107
Reference Manual
00809-0200-4840, Rev BA
Section 5: Service and Troubleshooting
December 2014
Section 5: Service and Troubleshooting
5.5.24
Preambles (D964)
This is read by a HART Master Device e.g. a Rosemount 3490 Series Control Unit to determine
how many preamble bytes are to be sent with each HART protocol message.
Field Communicator or AMS
To view the number of preamble bytes:
1.
From the
Home
screen, select 2: Configure.
2.
Select 2: Manual Setup.
3.
Select 4: HART/Identity.
4.
Select 2: Communication.
5.
Select 2: Preambles D964.
6.
When finished, press EXIT to exit to the previous menu.
Rosemount 3490 Series Control Unit
To view the number of preamble bytes:
1.
From the
Main Menu
screen, select SETUP.
2.
Select the transmitter (e.g. “Tx1: 3107”).
3.
Select SYSTEM.
4.
Select FIXED.
5.
Select HART.
6.
Select Num Req Preams.
7.
When finished, select “Quit” to exit to the previous menu.
Fast Keys
2, 2, 4, 2, 2
Preambles D964
5
EXIT
HELP
(Field Communicator Screen)
Num Req Preams D964
5
(Rosemount 3491 Screen)
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