Johnson Controls MS-FIT100-0 Manual de usuario
MS-FIT100-0 Field Inspection Tool User
Guide
LIT-12012443Building Technologies & Solutions
www.johnsoncontrols.com
2019-02-25
Contents
Contents
Introduction...................................................................................................................................... 3
Accessories............................................................................................................................................. 3
Physical Features................................................................................................................................... 3
General Use and Information.........................................................................................................4
FIT User Guidelines............................................................................................................................... 4
FIT Connection to Bus........................................................................................................................... 4
Modes of Operation.............................................................................................................................. 5
Monitor Mode..............................................................................................................................5
Scan Bus Mode............................................................................................................................ 5
1-ON-1 Mode............................................................................................................................... 5
Battery Usage.........................................................................................................................................5
Getting Prepared to use the FIT..................................................................................................... 6
FIT Menu............................................................................................................................................8
FIT Power On Menu...............................................................................................................................8
FIT Issues Menu.....................................................................................................................................9
1-ON-1 Menu........................................................................................................................................12
Monitor Menu...................................................................................................................................... 14
Scan Bus Menu.................................................................................................................................... 14
Voltage Menu....................................................................................................................................... 16
Idle Bus Menu............................................................................................................................16
Bit Voltage Menu.......................................................................................................................16
Meter Menu............................................................................................................................... 17
System Menu.................................................................................................................................. 17
Report Menu........................................................................................................................................ 19
General Bus Information......................................................................................................... 19
Device Information................................................................................................................... 19
Issue Information..................................................................................................................... 20
Report Submenu..................................................................................................................................20
Appendix A...................................................................................................................................... 21
MS/TP Communication Basics and the FIT...................................................................................... 21
Voltage Levels...................................................................................................................................... 23
Communication Voltage Levels...............................................................................................23
Idle Bus Voltage Levels.............................................................................................................24
Proper EOL Termination...........................................................................................................25
FIT Connection, EOL, and Shield Grounding Scenarios........................................................26
1-ON-1 Communication Voltage Levels............................................................................................ 30
Network Communication Voltage Levels...............................................................................30
Voltage Table............................................................................................................................. 31
Tips for Correcting Bus Installation Problems.................................................................................32
Quick Start Guide.................................................................................................................................33
FIT Display Table..................................................................................................................................33
Appendix B: FIT Firmware Update Instructions......................................................................... 42
Programming the FIT..........................................................................................................................49
MS-FIT100-0 Field Inspection Tool User Guideii
Introduction
The Field Inspection Tool (FIT) is a portable handheld device with a user interface that is used to
test and troubleshoot the BACnet® protocol MS/TP RS-485 communications bus that connects
supervisory controllers and field controllers to field point interfaces.
The FIT can be used to check out the wiring of the MS/TP RS-485 bus as well as verify proper
communications of supervisory controllers and field controllers connected to the bus. The FIT can
be used on both the Field Controller Bus (FCB) and Sensor Actuator Bus (SAB).
The FIT can perform the following functions on the FC/SA Bus:
• Measure bus bias voltage levels
• Communicate with controllers and provide:
- - Number of Devices Online
- - Device addresses
- - Model Name
- - Application Name
- - Firmware Revision
- - Status of End of Line (EOL) termination switch
- - Measure RS-485 communication voltage levels from controller
- - Other controller attributes
• Monitor and report communication errors
For more information on MS/TP basics see, MS/TP Communication Basics and the FIT.
Accessories
The following accessories for the FIT can be ordered separately:
Table 1: Products and Accessories
Code Number Description
MS-FITCASE-0 FIT carrying case; includes one soft-sided carrying case
FX-BTCVTCBL-700 FIT cable replacement; includes one 5 ft. (1.5m) retractable cable
Physical Features
The FIT is a portable handheld device. It is powered by two AA Alkaline batteries through the on/
off power switch. The LCD display is a two-line by eight-character display with backlight, and the
keypad consists of four keys. A Four-Pin removable terminal block, and the RJ-12 connector cable
provide the interface to the MS/TP bus. The FIT also has a Micro-USB port, which is used to update
the firmware and extract report data. See Figure 1.
3MS-FIT100-0 Field Inspection Tool User Guide
Figure 1: FIT Physical Features
Note: All the keys on the FIT have a repeat function in which the key action is repeated when
the key is held down for more than one second. For example, if you hold down the Down
Arrow Key, the cursor field moves down one selection each half second. The repeat rate is the
same for all the keys.
General Use and Information
FIT User Guidelines
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
MS-FIT100-0 Field Inspection Tool User Guide4
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 FC bus, but not the SA 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
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.
5MS-FIT100-0 Field Inspection Tool User Guide
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
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 cable and terminations
are correct but ensures the anticipated number of controllers match the quantity found. Validate
controller addresses and correct any duplicates.
Before using the FIT, the user needs to make sure the bus installation to be tested (FC or SA) is
complete and ready to be validated. This includes the following:
1. Bus cable is installed, and terminated at every controller.
2. MS/TP bus shield is continuous end to end for each bus segment with only one hard ground
per bus segment.
Note: RJ-12 connections, typically for sensors, do not require use of shielded cable due to
distance limitations.
3. EOLs are present at the end of each bus segment.
Note: Not applicable for SAB RJ-12 connections.
4. Power is available for every controller on the bus to be validated.
If no power is available to the controller when the MS/TP bus needs to be tested, providing
temporary power to the controllers to validate bus wiring is an option. If temporary power to all
controllers is not practical, there are two other options:
1. Use two FITs connected at each end of a bus or bus segment if unpowered repeaters are
present. Each FIT would be required to have different addresses and EOL set if applicable. See
System Menu section for more information on setting addresses and EOL attributes.
2. Use one FIT connected at the end of a bus and temporary power applied to the last controller
on that bus or bus segment if unpowered repeaters are present. If the FIT is at the end of a bus
segment, its EOL attribute should be set to ON.
Testing in these two methods does not ensure addresses are correctly set or detect every potential
controller MS/TP wiring mistake but does validate continuous bus wiring and end-to-end continuity.
For every installation, it is the installer’s responsibility to use the FIT to confirm:
1. A Bus Health reading of four bars or greater for all FC Bus installations.
2. All device addresses are reporting for each FC Bus installation and each address is correct.
3. A Bus Health reading of four bars or greater on all SA Bus installations.
Note: For most MS/TP installations, a properly installed bus achieves a Bus Health of eight
bars. Anything less than eight bars is normally an indication of an installation error but
could be caused by extremely long cable distances or a heavily loaded bus.
4. For each SA Bus installation, all device addresses are reporting.
MS-FIT100-0 Field Inspection Tool User Guide6
Figure 2: FIT Menu Screens
The FIT is designed to work with MS/TP hard wired controllers only and ignores wireless con-
nected controllers.
7MS-FIT100-0 Field Inspection Tool User Guide
FIT Menu
Figure 3: FIT Menu
FIT Power On Menu
Figure 4: FIT Power Menu
In this initial power on mode, the FIT is just monitoring FC/SA bus communications and is not
actively participating in communications.
MS-FIT100-0 Field Inspection Tool User Guide8
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