Varec 4120 Installation and operation manual - page 14
Multi-Element Temperature Transmitter
13
Installation and Operations Manual
Varec
Handheld Terminal
Interface
To support non-host configuration, the METT supports the Model 1200 Varec Handheld
Interface. The Rosemount Model 268 may be used if available. The METT supports the
ASCII interface in a similar manner to the Varec Model 4110 HART Level Encoder (LE).
That is, it answers to two different HART addresses. The first address is its address for
normal operation. The second address is the ASCII terminal address. The LE uses
address 15 for this. The METT will use HART address 14 to allow for tandem operation
with the LE in an MFT system.
To communicate with the METT using the Varec Handheld Interface, perform the
following steps:
•1.Make sure the Handheld Interface is not connected to the HART bus.
•2.Turn the Handheld Interface off and then on. It will first go through its self-test, then
try to communicate to a HART sensor at address 0. It will fail and display a warning
message, "Xmtr/268 not in communication".
•3.Press F2 to select multi-drop mode.
•4.Press F2 to select the address to communicate to.
•5.Press F2 twice to select address 14 and press F4 to start communication.
•6.The METT will clear the screen and place the cursor at the upper left corner.
•7.Pressing any key causes the METT to display the version number and ask if you want
display or alter mode. Press 'D' followed by F4 for display mode or 'A' followed by F4
to select alter mode.
•8.The F1 - F4 function keys have pre-defined functions. F1 is up, F2 is down, F3 is
modify/backspace, and F4 is the enter key. The 'Previous Function' key can be used to
abort modification of a variable or go up a menu level.
It is important to note that modifications done in Alter Mode do not take effect unless
'Exit and Save" is selected. This will cause the modifications to be saved to EEPROM and
used. If you disconnect the Handheld Interface or select the 'Quit' command, any
modifications that were made will be lost.
The menu interface is organized in a multi-level menu structure starting with the
Main Menu.
Main Menu
Decription
Average Temperature
1
Average Temperature. Only valid if host, such as MFT, has been
writing the level to the METT.
Level
1
Last level written to METT. This can be manually entered to
observe the effect of different levels.
Config Menu
Contains METT configuration menu items. See table below.
Diagnostic Menu
1
Contains METT diagnostic menu items. See table below.
Exit and Save
2
Must be used to exit the Alter Mode if configuration data modified
are to be entered.
Quit/Exit
Used to quit Alter Mode without saving. Also displayed as Exit in
display mode.