The Scan Bus mode interacts with the communications on the bus because it reads
the attributes of the controllers communicating on the bus. If no communications are
occurring on the bus, the Scan Bus mode starts communications to all controllers on
the bus. The Scan Bus mode is helpful when there is not an active supervisory
controller connected to the bus since it is the supervisory controller that usually starts
the communications due to fixed address. The Scan Bus mode is used to read the
EOL termination attribute of the controller. The EOL termination attribute is limited to
Johnson Controls manufactured products that have a built-in EOL switch. The
location of other EOL devices, such as the MS-BACEOL-0 or jumpers, are not
detected. See Proper EOL Termination , FIT Menu and Scan Bus Menu for more
information.
1-ON-1 Mode
The 1-ON-1 mode is used to test a single controller that is disconnected from the
network with the FIT connected to the FC Bus. In the 1-ON-1 mode, the FIT supplies
the proper EOL termination to test the communications of the device. In the 1-ON-1
mode, all of the attributes of the controller can also be read, such as Model name,
Firmware revision, EOL termination switch, and other attributes. The 1-ON-1 mode is
used to verify the operation of any single controller that does not communicate on
the bus. It is used to help determine if a Johnson Controls manufactured controller is
defective.
The FIT only validates MS/TP controllers and devices that are hardwired to a FC/SA
Bus. Wireless devices are not currently supported other than the 1-ON-1 mode at the
controller’s SAB port.
For more information, see FIT Menu and 1-ON-1 Menu .
Battery Usage
The FIT is operated from two AA Alkaline battery cells. When operated with the LCD
backlight turned off, the FIT can operate for approximately 50 continuous hours.
Continuous operation with the LCD backlight on is approximately 20 hours.
There is a battery test under the Systems menu to determine when to replace the
batteries. To replace the batteries, turn the power switch off. Remove the two AA
battery cells and replace with two AA Alkaline cells, while noting the proper polarity
of the battery holder.
Getting Prepared to use the FIT
About this task
The FIT tool is intended to be used with the Branch Engineered Installation Control
Drawings, Riser Diagrams, and Room Schedules. The tool, does not only validate the
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