Johnson Controls MS-FIT100-0 User manual

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MS-FIT100-0 Field Inspection Tool
User Guide
Table of contents
1. Introduction
1. Accessories
2. Physical Features
2. General Use and Information
1. FIT User Guidelines
2. FIT Connection to Bus
3. Modes of Operation
1. Monitor Mode
2. Scan Bus Mode
3. 1-ON-1 Mode
4. Battery Usage
3. Getting Prepared to use the FIT
4. FIT Menu
1. FIT Power On Menu
2. FIT Issues Menu
3. 1-ON-1 Menu
4. Monitor Menu
5. Scan Bus Menu
6. Voltage Menu
1. Idle Bus Menu
2. Bit Voltage Menu
3. Meter Menu
5. System Menu
1. Report Menu
1. General Bus Information
2. Device Information
3. Issue Information
1. Example Report in Excel
2. Report Submenu

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6. Appendix A
1. MS/TP Communication Basics and the FIT
2. Voltage Levels
1. Communication Voltage Levels
2. Idle Bus Voltage Levels
3. Proper EOL Termination
4. FIT Connection, EOL, and Shield Grounding Scenarios
3. 1-ON-1 Communication Voltage Levels
1. Network Communication Voltage Levels
2. Voltage Table
4. Tips for Correcting Bus Installation Problems
5. Quick Start Guide
6. FIT Display Table
7. Appendix B: FIT Firmware Update Instructions
1. Programming the FIT
8. Single point of contact
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

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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.
Figure 1. FIT Physical Features
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
Note:

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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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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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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.
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.
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:
Procedure
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.
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.
Note:
Note:
Note:

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4. For each SA Bus installation, all device addresses are reporting.
Figure 1. FIT Menu Screens
The FIT is designed to work with MS/TP hard wired controllers only and ignores
wireless connected controllers.
FIT Menu
Figure 1. FIT Menu
FIT Power On Menu
Figure 1. FIT Power Menu

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In this initial power on mode, the FIT is just monitoring FC/SA bus communications
and is not actively participating in communications.
The Bus Health consists of eight bars indicating the health of the FC/SA
communication bus. The higher number of bars the higher the health. When the FIT
is first connected to the bus, the Bus Health starts out at eight bars and then the
communications are monitored for errors. The number of bars is reduced if
communication errors are occurring. Communication errors can occur for various
reasons such as noise from electrical sources, long wire lengths, heavily loaded buses,
loose terminations, duplicate addresses, or improperly wired buses. Some
communication errors are tolerated as long as they do not cause issues such as
controllers going online and offline, erratic communications, or poor system control.
A Bus Health reading of eight bars is obviously desired, but it is considered
acceptable to have a Bus Health reading of four bars or more. Bus Health is basically
calculated by counting communication errors over time. A Bus Health of four bars
equates to two communication errors per minute, which is tolerable for FC/SA
communications.
When the FIT powers on, it may display No MSTP. This can mean the FIT is seeing
bus traffic, but a token is not passing between addresses. This occurs when one or
multiple FEC/VMA controllers on the bus have an address switch position eight
(normally labeled 128) in the ON position. This switch is not to be used on a hard-
wired Johnson Controls MS/TP Bus. It is reserved for Wireless bus installations. If you
see this condition, validate that all FEC/VMA MS/TP hard-wired controllers have the
128 switch in the OFF position.
No MSTP can also be displayed if an MS/TP bus which is active has installation errors
significant enough for the FIT to fail determining a baud rate. If this condition is
experienced, use the FIT’s Voltage > IdleBus to validate proper voltages (see Voltage
Levels for more information). In addition, the FIT’s baud rate could be adjusted from
the default autobaud in the System Menu to the specific baud rate of the bus that is
being tested (see System Menu for more information).
FIT Issues Menu
The Issues menu reports on any bus errors or other issues that are occurring on the
FC/SA bus the FIT is monitoring. The FIT is constantly monitoring the FC/SA bus for
errors. Only the last five communication errors are reported in the issue menu and
the FIT continues to update the number of issues during an MS/TP validation session.

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If the FIT is turned OFF, issue count and history are not maintained. For a list of
common issues and corrective actions, see Figure 6. No MSTP displays when the FIT
is connected to a Bus with a very poor Health Index.
Figure 1. FIT Issues Menu
To display the rest of the issues, depress the Down Arrow to scroll through
the issues. On any issue being displayed, depressing the Enter Key provides more
information specific to that issue. See Table 2 for a list of possible common issues.
See the FIT Display Table for more information of terminology used and acronyms in
the display examples.
Figure 2. Issue History
Table 1. List of Common Issues and Corrective Action
Display Description Potential Corrective Action
Note:

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Display Description Potential Corrective Action
BadFrame
system time
Bad MS/TP frame. Invalid
MS/TP header CRC or data
CRC. Bad frames are
typically caused by wiring
issues, duplicate addresses,
wrong baud rates and/or
noise.
1.
Check Idle Bus Voltage.
2.
Confirm the correct FIT baud
rate is being used.
3.
If repeaters are present, check
their baud rate.
4.
Check for duplicate addresses.
5.
Break the bus segments down
into smaller segments to
isolate, find and correct the
wiring problem.
Online Device came online. This is
listed as an issue because a
device came online after
the last bus loop.
Unless the controller was purposely
removed from the bus or had its
power turned off, determine why it
came online late.
This could be caused by a problem
with termination of 24 VAC power or
bus cables.
Go to the controller in question and
make sure all 24 VAC power and bus
cables are securely terminated.

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Display Description Potential Corrective Action
If token passing is not
occurring and is initiated with the FIT
connected to a bus (ScanBus Menu is
selected), Online Issues may result
until all addresses participate in the
token passing loop.
system time
ChrFrame Received character framing
error. Character frames can
also be caused by wiring
issues, duplicate addresses,
wrong baud rate or noise.
1.
Check Idle Bus Voltage.
2.
Confirm the correct FIT baud
rate is being used.
3.
If repeaters are present, check
their baud rate.
4.
Check for duplicate addresses.
5.
Break the bus segments down
into smaller segments to
isolate, find, and correct the
wiring problem.
system time
2ndTkn MS/TP token was re-
transmitted. A device
handed off the token, but
did not see any characters
1.
Note:

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Display Description Potential Corrective Action
transmitted on the bus, so
it re-transmitted the token. Can be caused by wiring
problems such as loose wires. If
one controller has to send a
token more than once it could
be a wiring issue with the
controller receiving the token.
2.
It can also be caused by a
duplicate address situation
where an address was changed
and duplicated on a
communicating bus.
system time
Offline Device went offline. This
device was online, received
a PFM (Poll for Master) and
did not reply to it.
Same potential corrective actions as
Online
system time
EOL >2 More than two devices with
EOL switch ON. When the
FIT is reading multiple bus
segments (across repeaters)
more than 2 EOL’s could be
expected.
If reading more than 2 EOL switch
positions ON for a single bus
segment, review switch positions of
each controller on the bus segment
to ensure only the actual controllers
at the EOL are being used. See
Proper EOL Termination for more
information.
system time
OutOfSeq A device on the bus talked
Out of Sequence or
attempted communication
without the token.
1.
Check to make sure there are
not EOLs set in the middle of a
bus segment.
Not typically caused by installation
errors. Identify issue to Johnson
Controls® personnel, so it can be
addressed with the manufacturer.

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1-ON-1 Menu
The 1-ON-1 menu is for testing a single controller disconnected from the network.
The controller of interest should first be disconnected from the network bus. For the
1-ON-1 test, the FIT should be connected to the controllers MS/TP bus of concern
being either the FC bus or the SA bus. The FIT can either be plugged into the RJ-12
jack on the controller if available or wired to the FC bus or SA bus terminal block of
the controller.
If the controller being connected to is not disconnected from the network
and is in an idle state, the connection can start the token passing on an idle network.
Use the 1-ON-1 test to verify the operation of an individual controller that may be
having communication issues when connected to the network or a controller that
may not be functioning properly. The FIT 1-ON-1 test communicates to the controller
and provide feedback to the user pertaining to the operation of the controller.
Figure 1. 1-ON-1 Test Menu
The 1-ON-1 test provides the following information from a Johnson Controls
manufactured controller:
Note:

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Model Type
Firmware Revision
Application Name
Controller Description
FC/SA Bus Address
Status of EOL termination switch (ON/OFF)
Voltage level of RS-485 communication from controller
Notes:
The Up Arrow key is used at any time to return to the previous screen.
The EOL is automatically turned on.
See Voltage Levels for more information on bus voltage levels.
Monitor Menu
The Monitor menu is used to monitor FC/SA bus controllers on a connected
network. In the Monitor mode the FIT monitors communications occurring on the
bus and report the status of the devices communicating.
When powered and connected to the bus if the FIT automatically displays the health
bars, then communication is occurring and the Monitor mode is entered by
depressing the Enter Key. See Figure 9.
In the Monitor mode, the FIT monitors communications and report:
The number of devices online
The address of each device online
The communication bus voltage levels of the device
Figure 1. Monitor Menu
See Voltage Levels for more information on bus voltage levels.Note:

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To scroll through the rest of the communication voltages for each controller address,
keep depressing the return key once for each device address. If you hold down the
Return Key, the display automatically scrolls through the voltage readings.
Scan Bus Menu
The Scan Bus mode is used to initiate, monitor, and interrogate controllers on the
FC/SA bus. In this mode, the FIT communicates with the controllers to read their
attributes. The Scan Bus mode 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 Idle Bus Voltage Levels
and the Voltage Menu section for more information. Selecting Scan Bus initiates
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
Figure 1. Scan Bus Menu

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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 System Menu for more information. Using the Expert Mode
communication is slower when a large amount of information is being transmitted
and received. For Johnson Controls manufactured equipment, Model and Vendor
data are displayed.
For a complete list of all attributes, and modes see the FIT Display Table . See
Network Communication Voltage Levels for more information on bus voltage levels.
Voltage Menu
The voltage menu has three voltage reading modes available:
Idle Bus Voltage
Bit Voltage
Meter
Idle Bus Menu
When selected, the Idle Bus Menu reads the bus bias voltage when no
communications are present. Proper idle bus voltage levels will not be displayed
unless EOL termination is present. The idle bus voltage menu shows the + line
voltage with respect to the COM line and the – line voltage with respect to the COM
line. The FIT can still read this voltage on an active communication bus by taking
Note:

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readings during communication pauses. For acceptable Idle Bus Voltage ranges, see
Voltage Levels and the Voltage Table .
It is possible and normal for there to be minor voltage fluctuations while
reading Idle Bus Voltages.
Figure 1. Idle Bus Menu
See Idle Bus Voltage Levels for more information.
Bit Voltage Menu
The Bit Voltage menu displays in real time the voltage when communication is
occurring on the bus. The differential voltage and bit voltage (+, – line with respect to
COM) from a controller are shown on the display. Approximately every half second, a
new voltage sample is taken from the bus and displayed. The voltage sample could
be from any controller on the bus that is communicating at the time of the sample.
Use the Bit Voltage mode for a quick look at the quality of the communications
occurring on the bus. For acceptable Bit Voltage ranges, see Voltage Levels and the
Voltage Table .
Figure 1. 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
Note:

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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 1. 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.
Battery—Select Battery to perform a battery test, display the battery status of
Good/Replace or display the battery voltage

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Baudrate—Select FIT baud rate to Auto Baud, 9600, 19200, 38400, 76800. Auto Baud
is default mode.
FitAddr—This menu allows the user to change the FIT address on the MS/TP bus.
The default address is 1. If the FIT determines there is already a device addressed at
1, it will automatically default to the next available free address.
Sys Time—Displays the amount of time FIT has been powered in seconds.
PowerOf—Displays the amount of time in minutes the FIT will stay in operation
before moving into a Sleeping mode. Adjustable from zero to 99 minutes. Default is
15 minutes and zero minutes means never enter sleep mode.
RS-485—Displays communication bit voltages, bit times and calculated baud rate of
the connected RS-485 circuit.
Figure 1. System Menu
See Proper EOL Termination , Voltage Levels , Report Menu , and Communication
Voltage Levels for more information.
Report Menu

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The FIT can save up to seven reports. The information saved to a report is captured
from the current data in the FIT’s memory. Normally only complete and functional FC
Bus installations are saved to Reports but if problems persist during installation
validation a Report could be used to capture and share information about a bus or
bus segment.
Each Report has three types of information stored as follows:
General Bus Information
Device Information
Issue Information
General Bus Information
The General information section of the report is one record and contains the
following information:
Table 1. General Bus Information
Heading Description
Report Name Name of the report entered by the user.
Health The Bus Health Index.
Devices The quantity of devices on the bus.
Idle Volts Differential Voltage Idle. This is + to – voltage reading without
communication.
Idle + + to Com Idle Voltage reading without communication.
Idle - - to Com Idle Voltage reading without communication.
Issues The number of issues reported.
Token Loop ms The recorded Loop Time.
Runtime sec This is the number of seconds from when the FIT was
powered on until the data was captured. The FIT does not
have a Clock. If report date and time is desired the
information must be captured manually.
Report # (Seq
Num)
This is a sequential number the FIT assigns to each report.
Device Information
The Device information section of the report is one record per address discovered.
Some information in this section can only be completed if:
a ScanBus was performed
The device is a Johnson Controls manufactured product.