Observe the following guidelines when using the FIT:
Do not use the RJ-12 cable to support the weight of the FIT. The FIT comes with
a magnetic strap for hanging from ductwork or other metal surfaces.
Keep the FIT in the protective shell with which it ships.
The FIT has not been designed for prolonged outdoor use. Leaving it in
outdoor environments may result in damage.
Keep FIT power off when not in use. Test the FIT batteries and replace them
when necessary. Prolonged battery use may cause battery leakage to occur.
To view training videos on using the FIT tool, click here to visit the uLearn website.
FIT Connection to Bus
The FIT is provided with a RJ-12 connector cable that is connected to the FC/SA 6 pin
RJ-12 jack found on most Johnson Controls® controllers. The FIT also has a Four-Pin
removable terminal block that is used to wire the FIT to the FC/SA bus. When the FIT
is connected to the FC bus, it can only see the devices directly connected on the FC
bus, but not the SA bus. Conversely, when the FIT is connected to the SA bus, it can
only see the devices on the SA bus, but not the FC bus.
It is best to connect the FIT tool to the bus and then power it up. Assuming
communication is occurring, the FIT first has to determine the baud rate of the
communication signal before it can read the communication messages. If the FIT is
powered before it is connected to the bus, the mechanical connection causes the bus
voltage to be unstable for a time, which can cause the FIT to mistake the proper baud
rate. The occurrence of this issue is unlikely, but it can occur. When no
communication is occurring (the bus is in a fixed idle state), the FIT initially displays
Offline.
Modes of Operation
The FIT has three main modes of operation to help troubleshoot MS/TP buses:
Monitor mode, Scan Bus mode, and 1-ON-1 mode.
Monitor Mode
The Monitor mode allows the FIT to see devices that are connected to and
communicating on the bus. If the health bars appear on the display when the FIT is
connected to the bus, then communications are occurring. Enter the Monitor mode
by pressing the Enter Key or by scrolling to the Monitor menu. The Monitor mode
only listens to the communications occurring on the bus, does not interact with the
communications, and therefore does not affect the operation of the bus. The Monitor
mode is recommended to use first if communications are already occurring on the
bus. For more information, see the FIT Menu and Monitor Menu .
Scan Bus Mode
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