CompuLab fitlet3 User manual

Owner’s Manual
Revision 1.1
Feb-2022

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Safety instructions
Use the following safety guidelines to help protect your computer from potential damage and to help to ensure your
personal safety. Unless otherwise noted, each procedure included in this document assumes that you have read the
safety information that shipped with your computer
WARNING: Disconnect all power sources before opening the
computer cover or panels. After you finish working inside
the computer, replace all covers, panels, and screws
before connecting to the power source.
CAUTION: Some repairs may only be done by a certified
service technician. You should only perform
troubleshooting and simple repairs as authorized in your
product documentation, or as directed by the online or
telephone service and support team. Damage due to
servicing, that is not authorized by Compulab, is not
covered by your warranty. Read and follow the safety
instructions that came with the product.
CAUTION: To avoid electrostatic discharge and prevent
internal components damage from electrostatic discharge when
touching computer or its parts, ground yourself by using a
wrist grounding strap or by periodically touching an
unpainted metal surface, such as a connector on the back of
the computer.
CAUTION: Handle components and cards with care. Do not
touch the components or contacts on a card. Hold a card by
its edges or by its metal mounting bracket. Hold a component
such as a processor by its edges, not by its pins.
CAUTION: When you disconnect a cable, pull on its connector
or on its pull-tab, not on the cable itself. Some cables
have connectors with locking tabs; if you are disconnecting
this type of cable, press in on the locking tabs before you
disconnect the cable. As you pull connectors apart, keep
them evenly aligned to avoid bending any connector pins.
Also, before you connect a cable, ensure that both
connectors are correctly oriented and aligned.

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Table of contents
SAFETY INSTRUCTIONS....................................................................................2
INTRODUCTION ..................................................................................................4
SPECIFICATIONS............................................................................................. 5
FEATURES ....................................................................................................... 5
DIMENSIONS.................................................................................................... 6
INTERFACES.................................................................................................... 6
EXPANSION BOARDS ......................................................................................... 7
OPTIONAL ACCESSORIES .................................................................................. 7
CONNECTORS LAYOUT........................................................................................ 8
QUICK START GUIDE........................................................................................9
MINIMUM REQUIREMENTS .................................................................................. 9
IDENTIFYING FITLET3CONFIGURATION ........................................................... 9
OPENING FITLET3........................................................................................... 9
INSTALLING RAM.......................................................................................... 11
M.2 COOLING PLATE,SSD AND MODEM......................................................... 12
RTC BATTERY ............................................................................................... 17
INSTALLING RTC BATTERY............................................................................ 17
RE-ASSEMBLING FITLET3.............................................................................. 18
CONNECTING FITLET3.................................................................................... 19
ENTERING BIOS SETUP ................................................................................ 20
INSTALLING AND BOOTING OPERATING SYSTEM ............................................... 20
SERVICE...........................................................................................................21
SUPPORT ....................................................................................................... 21
WARRANTY ..................................................................................................... 21
RMA ............................................................................................................. 21
For more information and to obtain the latest revision of
this document, please visit: www.fit-iot.com
For technical support and product related questions,
please email: [email protected]

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Introduction
Thank you for purchasing fitlet3. It is a miniature PC designed to be tough,
capable, versatile and user-friendly. With proper installation, we expect
fitlet3 to serve you for many years. The unique fanless design of fitlet3
eliminates the need for any maintenance after installation.
Please consult this owner’s manual for getting started with fitlet3. You are
welcome to contact fitlet3 manufacturer –Compulab at www.fit-iot.com or
[e-mail] should you have any technical questions.
fitlet3 features
•Intel Elkhart Lake CPU
•Up to 32 GB DDR4 RAM
•NVMe | M.2 SATA | 2.5” storage*
•Dual head 4K display
•Up to 4 Gbit Ethernet ports* | WiFi* | cellular communication*
•USB 3.1, USB 2.0, audio*, optional Isolated serial + GPIO ports, indicator
LED
•Supports Windows 10, Windows 11 and Linux
•Can be extended with Function And Connectivity Extension T-Cards (FACET
Cards)
•All-metal fanless housing 132.8 mm X 100 mm X 34.8 mm
•Operating temperature range is from -40°C to 85°C (depending on ordered
configuration)
*Feature is not assembled by default or may require an extension FACET card
Package contents
1. fitlet3 computer
2. Power supply: input 100-240VAC 50/60Hz, output 12VDC 3A with universal AC plugs
3. Antennas, according to configuration
4. Owner’s manual
NOTES
•Additional accessories can be purchased separately here:
https://fit-iot.com/web/products/fitlet3/buy-fitlet3/
•Some fitlet3 configurations come pre-installed with additional devices and
accessories

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Specifications
Features
IOT gateway / Fanless industrial PC
Intel® Atom Elkhart Lake processor
NVMe + SATA storage
2x/4x Gigabit LAN
Optional Wi-Fi/BT + LTE/5G modem
Optional Isolated serial + GPIO ports
7V –42V DC power input
CPU
Intel® Atom x6425E
4 Core | Base: 2.0 GHz, Boost: 3.0 GHz | TDP: 12 W
Intel® Celeron J6412
4 Core | Base: 2.0 GHz, Boost: 2.6 GHz | TDP: 10 W
Intel® Atom x6211E
2 Core | Base: 1.3 GHz, Boost: 3.0 GHz | TDP: 6 W
Memory
Type
SO-DIMM DDR4 up to 3200MT/s
Max. capacity
32 GB
Storage
M.2 Key-M
PCIe x4 / SATA for M.2 NVMe or SATA, size up to 2280
M.2 Key-B
SATA for M.2 SATA, size up to 2260
2.5” HDD/SSD
Optional M.2 to SATA expansion for 2.5” HDD / SSD
Display
HDMI
HDMI 1.4b (up to 3840 x 2160 @ 30Hz)
Mini-Display Port
DP 1.2 (up to 4096 x 2160 @ 60Hz) Dual mode
Ethernet
Type
2x Gigabit Ethernet on RJ45
Controllers
2x Internal MAC with discreet PHY
Speed
1000 Mbps / 100 Mbps / 10 Mbps
Optional FC3-LAN
Additional 2x GbE LAN on RJ45
Optional FC3-OPLN
Additional 1x GbE LAN on SFP+ for optical LAN
Optional FC3-POED
Additional 1x GbE LAN on RJ45 with PoE device capabilities
Wireless
Connectivity
On-board
Optional On-board module with Wi-Fi 6E, BT 5.2
M.2 Key-E 1
For M.2 2230 module with Wi-Fi 6E, BT 5.2
M.2 Key-B
For M.2, LTE/5G modem, with micro-SIM tray
USB
USB 2.0
4x USB 2.0 on USB Type-A
USB 3.1
2x USB 3.1 on USB Type-A
Serial/GPIO
Type
Isolated serial and GPIO, up to 24V, on terminal block
Serial port
Optional isolated RS-232/422/485
GPIO
2x isolated GPI + 2x isolated GPO
Audio
Codec
Optional audio codec
Interfaces
Optional analog output, analog input on 3.5 mm jacks
Power
Input power
7V –42V, up to 5A DC input
Connector
5.5 mm power jack w/ locking
Power supply unit
Including universal AC wall mount power supply
Optional FC3-PoE
Input power by PoE, GbE LAN on RJ45
TPM
Internal fTPM
Intel® PTT
Discreet TPM
Optional discreet TPM 2.0
OS support
Windows 10
Windows 10 Pro / Windows 10 LTSC 2021 IoT Enterprise
Windows 11
Windows 11 Pro
Linux
Linux Mint / Ubuntu
Operating
Environment
Commercial temperature
0°C to 45°C
Extended temperature
-20°C to 70°C
Industrial temperature
-40°C to 85°C
Humidity
5% - 95% non-condensing
Physical
Characteristics
Cooling
Fanless, passive cooling
Dimensions
132.8 mm X 100 mm X 34.8 mm
Weight
~ 420 gr.
Mounting
Side / bottom VESA / DIN Rail mount

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Dimensions
Interfaces
Location
Connector
Interface
Front Panel
2x USB Type-A
2x USB 2.0
1x HDMI
HDMI 1.4b (up to 3840 x 2160 @ 30Hz)
1x mini-DP
DP 1.2 (up to 4096 x 2160 @ 60Hz) Dual mode
1x 5.5 mm power jack
7V –42V DC power input
1x terminal block (Optional)
Isolated RS-232/422/485 + 2x GPI + 2x GPO
2x RJ45
2x 10/100/1000 Mbps Ethernet
Rear Panel
Power button
On/Off push button w/ power LED
2x USB Type-A
2x USB 3.1
2x 3.5 mm jacks (Optional)
Analog output, analog input audio
Micro-SIM tray
Micro-SIM Tray for M.2 LTE/5G modem
LED
Debug/programmable LED
2x USB Type-A
2x USB 2.0
Right Panel
2x SMA (Optional)
2x SMA antennas for Wi-Fi/BT or cellular modem
Left Panel
FACET card connectors (Optional)
Ethernet, serial, etc. from FACET expansion card
2x SMA (Optional)
2x SMA antennas for Wi-Fi/BT or cellular modem
Location
Connector
Form factor
Interface
Usage
Internal Top
SO-DIMM
DDR4 SO-DIMM
DDR4
DDR4 module
Internal
Bottom
M.2 Key-M
M.2 up to 2280 or
Optional 2.5” SATA storage 1
PCIe Gen 3 x4 / SATA
-NVMe/SATA storage
-M.2 PCIe x1x HDMI
M.2 Key-B
M.2 Up to 3060 or
Optional 2.5” SATA storage 1
PCIe Gen 3 x1 /SATA
USB 2.0
-LTE/5G modem
-SATA storage
M.2 Key-E
M.2 2230 or
FACET expansion card 2
PCIe Gen 3 x2
USB 2.0
-Wi-Fi/BT module
-FACET card
Notes:
1. Up to 1 unit of 2.5” SATA storage expansion (EB-M2SATA) is possible
2. FACET expansion card and Wi-Fi/BT card are mutually exclusive. For Wi-Fi/BT on systems with FACET cards,
on-board Wi-Fi/BT module bust be selected.

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Expansion boards
Name
Description
Compatible connector
FC3-LAN
2x GbE LAN on RJ45
M.2 Key-E (FACET) 1
FC3-POED
GbE LAN PoE device on RJ45
M.2 Key-E (FACET) 1
FC3-OPLN
GbE on SFP+ for optic LAN
M.2 Key-E (FACET)1
EB-M2SATA
SATA expansion for 2.5” HDD /
SSD 2,3
M.2 Key-M or M.2 Key-B
Notes:
1. FACET expansion card and Wi-Fi/BT card are mutually exclusive. For Wi-Fi/BT on systems with FACET cards,
on-board Wi-Fi/BT module bust be selected.
2. Up to 1 unit of EB-M2SATA is possible, and up to two storage devices in total.
3. EB-M2SATA expansion requires deep bottom that will enlarge the fitlet3 size.
Optional accessories
Name
Description
FITLET3-ACC-PSU
Universal power supply unit (one units is included in fitlet3 package)
FITLET3-ACC-BRKT
VESA mounting bracket
FITLET3-ACC-DIN
DIN rail mounting kit (Requires VESA mounting bracket)
FITLET3-ACC-DINSD
Side DIN rail mounting kit (does not require VESA mounting bracket)
FITLET3-ACC-POWBTN
Remote power button with LED with 25cm wire

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Connectors’ layout

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Quick start guide
Minimum requirements
To use fitlet3 you will need:
•RAM and storage device (if not pre-installed)
•A display with HDMI or DisplayPort input + HDMI or mini-DisplayPort cable
•USB keyboard and mouse
Identifying fitlet3 configuration
fitlet3 configuration is detailed on the label attached to the bottom side of the
computer.
Note
Pay attention to RAM and storage. If not installed, fitlet3 will not boot. You will
have to install these devices firstly.

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Opening fitlet3
You will need to open fitlet3 in order to install RAM, storage and RTC battery.
Required tool: Phillips screwdriver.
To open fitlet3 please follow these steps:
1.Place fitlet3 on a flat surface bottom-up.
2.Open the four screws using the Phillips screwdriver (counter clock-wise).
3.Lift the bottom cover to remove it. Side panels should fall-off.
4.Lift fitlet3 from the top cover

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Installing RAM
RAM socket is positioned on the top side of the motherboard.
fitlet3 accepts a single SODIMM DDR4.
Insert DDR4 SODIMM module and press it down until it is latching firmly on
both sides

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M.2 cooling plate, SSD and modem
The M.2 cooling plate has several purposes:
•Allow installation of multiple form factor M.2 devices
•Provide cooling to M.2 devices
•Assist in battery placement
•Provide proper cable management inside fitlet3
M.2 Key-M accepts SATA of NVME modules, 2230, 2242, 2260 or 2280.
M.2 Key-B accepts SATA M.2 modules or modems, with lengths of 30mm, 42mm,
52mm or 60mm and widths 22mm or 30mm
The SSD has to be fastened to the M.2 cooling plate. Then the M.2 cooling
plate is then placed on the underside of the motherboard and fastened to
the front and back panel
To install SSD onto M.2 cooling plate
1. Peel-off protective film from the two thermal pads.
2. Place the red M.2 spacer according to the length of the M.2 SSD as
depicted below. Note orientation of the spacer: The recessed side should
face the alignment screws. Insert M.2 fastening screw but do not tighten!

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3. Place edge of M.2 SSD against the fastening screw
a. Press the SSD firmly against the thermal pad until its connector edge
is seated between the alignment pins.
Once positioned correctly the connector edge should stick out above
the edge of the M.2 cooling plate.
4. Tighten the fastening screw
5. Turn over the M.2 cooling plate and push the M.2 SSD into its socket
at the underside of the motherboard.

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6. Push down the M.2 cooling plate and tighten the 3 panel screws

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Optional WiFi/BT Module
By default the WiFi/BT module is not installed.
Installing WiFi/BT module
1. Assemble the adapter
2. Tighten the appropriate screws
3. Insert the red spacer and fastening screw but do not tighten it.

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4. Insert the WiFi/BT module into an appropriate socket in an angle.
5. Press it down until latching the spacer.
6. Tighten the fastening screw.

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RTC battery
The RTC battery is used for keeping time and date while fitlet3 is
disconnected from power. BIOS settings and power-up policy is
independent of battery. fitlet3 normally ships with the battery
unplugged to ensure that the battery is not discharged during
warehousing.
The battery can keep charge for approx. 5 years when fitlet3 is
disconnected and significantly longer when fitlet3 is connected to
power. Battery can be purchased separately to be replaced by the user.
Installing RTC battery
1. Connect the battery plug to the corresponding socket (see illustration).
2. Place the wire as shown inside the slots of the M.2 cooling plate to minimize
clutter.
3. Place the battery in the marked pocket. Once fitlet3 bottom cover is assembled
- the battery is secured in place.

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Re-assembling fitlet3
1. Place the fitlet3 onto the top cover.
Note: The top cover is symmetric –direction does not matter.
2. Place the bottom cover onto the fitlet3.
Important note: The tall U-shaped boss (!) has to be near the M.2 sockets. Otherwise,
the bottom cover will not fit!
3. Click both side panels into place
4. Tighten the 4 screws

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Connecting fitlet3
1. Before connecting fitlet3 please ensure that RAM and storage device are installed as detailed in the
above sections.
2. Connect the display to fitlet3 using HDMI or mini-DP cable.
3. Connect to fitlet3 USB keyboard and mouse.
4. Insert the DC plug into the fitlet3 DC-in jack.
5. Rotate clockwise 90° to secure.
6. Slide into the power-supply the AC blade correct to your country and plug the power-supply into an AC-
outlet. The power button on fitlet3 should turn green, in a few seconds an image should appear on the
display.
7. Connect Ethernet cable as needed. When link is established, the link LED on RJ45 should light.
8. If fitlet3 has WiFi adapter installed you will observe two SMA connectors (gold color screws) on the
side panel. Connect the included antennas by screwing them clockwise onto the SMA connectors to enable
WiFi communication.

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Entering BIOS Setup
Turn off the fitlet3.
Turn on while holding down the Del key, until access into AMI Inc. BIOS utility.
See http://www.fit-pc.com/wiki/index.php/Main_Page.
Installing and booting operating system
Please consult https://www.fit-iot.com/web/products/fitlet3/os for instructions.