Johnson Controls MS-FIT100-0 User Manual page 17

is used when there are communications occurring on the bus or if there are no communications
occurring. If no communication is occurring, do not initiate the Scan Bus mode until you verify
that the idle bus voltage readings are at their desired levels on each bus segment. See
Voltage Levels
and the
communications to all devices on the bus. A correctly installed bus scan completes within a couple
of minutes.
In the Scan Bus mode, the FIT monitors communications and interrogates controllers to report:
• The number of devices online
• The address of each device online
• The communication bus voltage levels of the device
• Status of EOL termination switch on the device
• Model
• Vendor
Note: Use Expert mode instead of Install mode when you need to read a greater number of
attributes from each device. The FIT defaults to Install mode to make user operation easier.
The User Mode can be changed from Install to Expert under the System Menu. See
Menu
for more information. Using the Expert Mode communication is slower when a large
MS-FIT100-0 Field Inspection Tool User Guide
Voltage Menu
section for more information. Selecting Scan Bus initiates
Figure 9: Scan Bus Menu
Idle Bus
System
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