Meter Menu; System Menu - Johnson Controls MS-FIT100-0 User Manual

Voltage Levels
of the communications occurring on the bus. For acceptable Bit Voltage ranges, see
and the Voltage Table.
Figure 11: Bit Voltage Menu

Meter Menu

The Meter menu turns the display into a voltmeter that is measuring the current voltage seen on
the bus. This mode can be used to look at voltage bias levels or to determine if there is any voltage
caused by noise sources or improper wiring occurring on the bus.
It is important to understand that once MS/TP communication is active, voltage readings with
a Volt-Ohm-Meter (VOM) or via the FIT's Voltage Menu item Meter are largely irrelevant. These
readings could be used and provide meaningful data only if the MS/TP is completely idle due to
communication not being activated by an NAE or the FIT tool. For an active bus, to achieve this
complete idle state, every controller would have to be powered down, bus connection to the NAE
removed and the controllers powered back up. If the FIT is connected to a properly wired bus and
indicates Offline, meaning the Bus Health bar is not displayed, the bus is in an idle state and will
remain that way until the FIT Tool, NAE or some other device starts MS/TP communication. The FIT
is designed to work around typical VOM limitations and can provide idle bus reading on active MS/
TP communications. See the Voltage Levels for more information.
Figure 12: Meter Menu

System Menu

Some of the System Menu selections have user functions to adjust variables to match the condition
being tested. Any adjustments changes made will reset to their default values at FIT power on.
The System Menu has the following functions:
BackLit—Turn backlight On/Off. The default setting is Off.
EOL—Turn the EOL termination on the FIT On/Off. The EOL termination is controlled by the FIT
depending on the function being used, either the 1-ON-1 Mode Default EOL is on or the Monitor
and Scan Bus mode default EOL is Off. This command allows the user to override the EOL status.
Mode—Select the Install mode or the Expert mode. In expert mode when using Scan Bus menu
more attributes are available to read from the device such as Model, Firmware Version, Application
name and more. The default mode is Install mode and is recommended for most users.
MS-FIT100-0 Field Inspection Tool User Guide 17