Nexcom ISA 140 User manual

NEXCOM International Co., Ltd.
NEXCOM International Co., Ltd.
Published January 2022 www.nexcom.com
Network and Communication Solutions
Industrial-Grade Platform
ISA 140
User Manual

Copyright © 2022 NEXCOM International Co., Ltd. All Rights Reserved. ii ISA 140 User Manual
Content
Contents
Preface
Copyright ............................................................................................. iv
Disclaimer.............................................................................................. iv
Acknowledgements ............................................................................... iv
Regulatory Compliance Statements........................................................ iv
Declaration of Conformity...................................................................... iv
RoHS Compliance ................................................................................... v
Warranty and RMA ................................................................................ vi
Safety Information ................................................................................viii
Installation Recommendations...............................................................viii
Safety Precautions.................................................................................. ix
Technical Support and Assistance............................................................ x
Conventions Used in this Manual............................................................ x
Global Service Contact Information........................................................ xi
Package Contents.................................................................................xiii
Ordering Information ............................................................................xiv
Chapter 1: Product Introduction
Overview ................................................................................................1
Key Features........................................................................................1
Hardware Specifications..........................................................................2
Knowing Your ISA 140............................................................................3
Mechanical Dimensions...........................................................................4
Chapter 2: Jumpers and Connectors
Before You Begin ....................................................................................5
Precautions ............................................................................................5
Jumper Settings ......................................................................................6
Locations of the Jumpers and Connectors...............................................7
Jumpers..................................................................................................9
CMOS Clear ........................................................................................9
Connector type: 1x3 3-pin header, 2.54mm pitch ................................9
Programmable for MCU ......................................................................9
Connector Pin Definitions .....................................................................10
External I/O Interfaces........................................................................10
USB3.0...........................................................................................10
HDMI Connector ...............................................................................10
Internal Connectors...........................................................................11
M.2 B-Key SATA.............................................................................11
M.2 B-Key LTE ...................................................................................11
Mini PCIe Slot....................................................................................12
Power and Reset................................................................................12
Micro SIM Connector ........................................................................13
Block Diagram ......................................................................................14
Chapter 3: System Setup
Removing the Bottom Chassis Cover.....................................................15
Installing an M.2 SSD Storage Module ..................................................16
Installing SO-DIMM Memory Modules...................................................18

Copyright © 2022 NEXCOM International Co., Ltd. All Rights Reserved. iii ISA 140 User Manual
Content
Installing a Wireless LAN Module ..........................................................19
Installing a LTE Module .........................................................................21
Installing a SIM Card.............................................................................23
Chapter 4: BIOS Setup
About BIOS Setup.................................................................................24
When to Configure the BIOS.................................................................24
Default Configuration...........................................................................25
Entering Setup......................................................................................25
Legends................................................................................................25
BIOS Setup Utility..................................................................................27
Main .................................................................................................27
Advanced .........................................................................................28
Chipset..............................................................................................37
Security .............................................................................................41
Boot..................................................................................................42
Save & Exit ........................................................................................43

Copyright © 2022 NEXCOM International Co., Ltd. All Rights Reserved. iv ISA 140 User Manual
Preface
PrefaCe
Copyright
This publication, including all photographs, illustrations and software, is
protected under international copyright laws, with all rights reserved. No
part of this manual may be reproduced, copied, translated or transmitted in
any form or by any means without the prior written consent from NEXCOM
International Co., Ltd.
Disclaimer
The information in this document is subject to change without prior notice and
does not represent commitment from NEXCOM International Co., Ltd. However,
users may update their knowledge of any product in use by constantly checking
its manual posted on our website: http://www.nexcom.com. NEXCOM shall
not be liable for direct, indirect, special, incidental, or consequential damages
arising out of the use of any product, nor for any infringements upon the rights
of third parties, which may result from such use. Any implied warranties of
merchantability or fitness for any particular purpose is also disclaimed.
Acknowledgements
ISA 140 is a trademark of NEXCOM International Co., Ltd. All other product
names mentioned herein are registered trademarks of their respective owners.
Regulatory Compliance Statements
This section provides the FCC compliance statement for Class A devices and
describes how to keep the system CE compliant.
Declaration of Conformity
FCC
This equipment has been tested and verified to comply with the limits for
a Class A digital device, pursuant to Part 15 of FCC Rules. These limits are
designed to provide reasonable protection against harmful interference when
the equipment is operated in a commercial environment. This equipment
generates, uses, and can radiate radio frequency energy and, if not installed
and used in accordance with the instructions, may cause harmful interference
to radio communications. Operation of this equipment in a residential area
(domestic environment) is likely to cause harmful interference, in which
case the user will be required to correct the interference (take adequate
measures) at their own expense.
CE
The product(s) described in this manual complies with all applicable
European Union (CE) directives if it has a CE marking. For computer systems
to remain CE compliant, only CE-compliant parts may be used. Maintaining
CE compliance also requires proper cable and cabling techniques.

Copyright © 2022 NEXCOM International Co., Ltd. All Rights Reserved. vISA 140 User Manual
Preface
RoHS Compliance
NEXCOM RoHS Environmental Policy and Status
Update
NEXCOM is a global citizen for building the digital
infrastructure. We are committed to providing green
products and services, which are compliant with
European Union RoHS (Restriction on Use of Hazardous Substance in
Electronic Equipment) directive 2011/65/EU, to be your trusted green
partner and to protect our environment.
RoHS restricts the use of Lead (Pb) < 0.1% or 1,000ppm, Mercury (Hg)
< 0.1% or 1,000ppm, Cadmium (Cd) < 0.01% or 100ppm, Hexavalent
Chromium (Cr6+) < 0.1% or 1,000ppm, Polybrominated biphenyls (PBB) <
0.1% or 1,000ppm, and Polybrominated diphenyl Ethers (PBDE) < 0.1% or
1,000ppm.
In order to meet the RoHS compliant directives, NEXCOM has established an
engineering and manufacturing task force in to implement the introduction
of green products. The task force will ensure that we follow the standard
NEXCOM development procedure and that all the new RoHS components
and new manufacturing processes maintain the highest industry quality
levels for which NEXCOM are renowned.
The model selection criteria will be based on market demand. Vendors and
suppliers will ensure that all designed components will be RoHS compliant.
How to recognize NEXCOM RoHS Products?
For existing products where there are non-RoHS and RoHS versions, the
suffix “(LF)” will be added to the compliant product name.
All new product models launched after January 2013 will be RoHS compliant.
They will use the usual NEXCOM naming convention.

Copyright © 2022 NEXCOM International Co., Ltd. All Rights Reserved. vi ISA 140 User Manual
Preface
Warranty and RMA
NEXCOM Warranty Period
NEXCOM manufactures products that are new or equivalent to new in
accordance with industry standard. NEXCOM warrants that products will
be free from defect in material and workmanship for 2 years, beginning on
the date of invoice by NEXCOM. HCP series products (Blade Server) which
are manufactured by NEXCOM are covered by a three year warranty period.
NEXCOM Return Merchandise Authorization (RMA)
▪Customers shall enclose the “NEXCOM RMA Service Form” with the
returned packages.
▪Customers must collect all the information about the problems
encountered and note anything abnormal or, print out any on-screen
messages, and describe the problems on the “NEXCOM RMA Service
Form” for the RMA number apply process.
▪Customers can send back the faulty products with or without accessories
(manuals, cable, etc.) and any components from the card, such as CPU
and RAM. If the components were suspected as part of the problems,
please note clearly which components are included. Otherwise, NEXCOM
is not responsible for the devices/parts.
▪Customers are responsible for the safe packaging of defective products,
making sure it is durable enough to be resistant against further damage
and deterioration during transportation. In case of damages occurred
during transportation, the repair is treated as “Out of Warranty.”
▪Any products returned by NEXCOM to other locations besides the
customers’ site will bear an extra charge and will be billed to the customer.
Repair Service Charges for Out-of-Warranty Products
NEXCOM will charge for out-of-warranty products in two categories, one is
basic diagnostic fee and another is component (product) fee.
Repair Service Charges for Out-of-Warranty Products
NEXCOM will charge for out-of-warranty products in two categories, one is
basic diagnostic fee and another is component (product) fee.
System Level
▪Component fee: NEXCOM will only charge for main components such as
SMD chip, BGA chip, etc. Passive components will be repaired for free,
ex: resistor, capacitor.
▪Items will be replaced with NEXCOM products if the original one cannot
be repaired. Ex: motherboard, power supply, etc.
▪Replace with 3rd party products if needed.
▪If RMA goods can not be repaired, NEXCOM will return it to the customer
without any charge.
Board Level
▪Component fee: NEXCOM will only charge for main components, such
as SMD chip, BGA chip, etc. Passive components will be repaired for free,
ex: resistors, capacitors.
▪If RMA goods can not be repaired, NEXCOM will return it to the customer
without any charge.

Copyright © 2022 NEXCOM International Co., Ltd. All Rights Reserved. vii ISA 140 User Manual
Preface
Warnings
Read and adhere to all warnings, cautions, and notices in this guide and
the documentation supplied with the chassis, power supply, and accessory
modules. If the instructions for the chassis and power supply are inconsistent
with these instructions or the instructions for accessory modules, contact
the supplier to find out how you can ensure that your computer meets
safety and regulatory requirements.
Cautions
Electrostatic discharge (ESD) can damage system components. Do the
described procedures only at an ESD workstation. If no such station is
available, you can provide some ESD protection by wearing an antistatic
wrist strap and attaching it to a metal part of the computer chassis.

Copyright © 2022 NEXCOM International Co., Ltd. All Rights Reserved. viii ISA 140 User Manual
Preface
Installation Recommendations
Ensure you have a stable, clean working environment. Dust and dirt can get
into components and cause a malfunction. Use containers to keep small
components separated.
Adequate lighting and proper tools can prevent you from accidentally
damaging the internal components. Most of the procedures that follow
require only a few simple tools, including the following:
▪A Philips screwdriver
▪A flat-tipped screwdriver
▪A grounding strap
▪An anti-static pad
Using your fingers can disconnect most of the connections. It is recommended
that you do not use needle-nose pliers to disconnect connections as these
can damage the soft metal or plastic parts of the connectors.
Safety Information
Before installing and using the device, note the following precautions:
▪Read all instructions carefully.
▪Do not place the unit on an unstable surface, cart, or stand.
▪Follow all warnings and cautions in this manual.
▪When replacing parts, ensure that your service technician uses parts
specified by the manufacturer.
▪Avoid using the system near water, in direct sunlight, or near a heating
device.
▪The load of the system unit does not solely rely for support from the
rackmounts located on the sides. Firm support from the bottom is highly
necessary in order to provide balance stability.
▪The computer is provided with a battery-powered real-time clock circuit.
There is a danger of explosion if battery is incorrectly replaced. Replace
only with the same or equivalent type recommended by the manufacturer.
Discard used batteries according to the manufacturer’s instructions.

Copyright © 2022 NEXCOM International Co., Ltd. All Rights Reserved. ix ISA 140 User Manual
Preface
Safety Precautions
1. Read these safety instructions carefully.
2. Keep this User Manual for later reference.
3. Disconnect this equipment from any AC outlet before cleaning. Use a
damp cloth. Do not use liquid or spray detergents for cleaning.
4. For plug-in equipment, the power outlet socket must be located near the
equipment and must be easily accessible.
5. Keep this equipment away from humidity.
6. Put this equipment on a stable surface during installation. Dropping it or
letting it fall may cause damage.
7. The openings on the enclosure are for air convection to protect the
equipment from overheating. DO NOT COVER THE OPENINGS.
8. Make sure the voltage of the power source is correct before connecting
the equipment to the power outlet.
9. Place the power cord in a way so that people will not step on it. Do not
place anything on top of the power cord. Use a power cord that has been
approved for use with the product and that it matches the voltage and
current marked on the product’s electrical range label. The voltage and
current rating of the cord must be greater than the voltage and current
rating marked on the product.
10. All cautions and warnings on the equipment should be noted.
11. If the equipment is not used for a long time, disconnect it from the
power source to avoid damage by transient overvoltage.
12. Never pour any liquid into an opening. This may cause fire or electrical
shock.
13. Never open the equipment. For safety reasons, the equipment should be
opened only by qualified service personnel.
14. If one of the following situations arises, get the equipment checked by
service personnel:
a. The power cord or plug is damaged.
b.Liquid has penetrated into the equipment.
c. The equipment has been exposed to moisture.
d.The equipment does not work well, or you cannot get it to work
according to the user’s manual.
e. The equipment has been dropped and damaged.
f. The equipment has obvious signs of breakage.
15. Do not place heavy objects on the equipment.
16. The unit uses a three-wire ground cable which is equipped with a third
pin to ground the unit and prevent electric shock. Do not defeat the
purpose of this pin. If your outlet does not support this kind of plug,
contact your electrician to replace your obsolete outlet.
17. CAUTION: DANGER OF EXPLOSION IF BATTERY IS INCORRECTLY
REPLACED. REPLACE ONLY WITH THE SAME OR EQUIVALENT TYPE
RECOMMENDED BY THE MANUFACTURER. DISCARD USED BATTERIES
ACCORDING TO THE MANUFACTURER’S INSTRUCTIONS.

Copyright © 2022 NEXCOM International Co., Ltd. All Rights Reserved. xISA 140 User Manual
Preface
Technical Support and Assistance
1. For the most updated information of NEXCOM products, visit NEXCOM’s
website at www.nexcom.com.
2. For technical issues that require contacting our technical support team or
sales representative, please have the following information ready before
calling:
– Product name and serial number
– Detailed information of the peripheral devices
– Detailed information of the installed software (operating system,
version, application software, etc.)
– A complete description of the problem
– The exact wordings of the error messages
Warning!
1. Handling the unit: carry the unit with both hands and handle it with care.
2. Maintenance: to keep the unit clean, use only approved cleaning products
or clean with a dry cloth.
3. CFast: Turn off the unit’s power before inserting or removing a CFast
storage card.
Conventions Used in this Manual
Warning:
Information about certain situations, which if not observed,
can cause personal injury. This will prevent injury to yourself
when performing a task.
CAUTION!
CAUTION!CAUTION! Caution:
Information to avoid damaging components or losing data.
Note:
Provides additional information to complete a task easily.

Copyright © 2022 NEXCOM International Co., Ltd. All Rights Reserved. xi ISA 140 User Manual
Preface
Global Service Contact Information
Headquarters
NEXCOM International Co., Ltd.
9F, No. 920, Chung-Cheng Rd.,
ZhongHe District, New Taipei City, 23586,
Taiwan, R.O.C.
Tel: [phone]
Fax: [phone]
www.nexcom.com
Asia
Taiwan
NexAIoT Co., Ltd.
Taipei Office
13F, No.916, Chung-Cheng Rd.,
ZhongHe District,
New Taipei City, 23586, Taiwan, R.O.C.
Tel: [phone]
Fax: [phone]
Email: [email protected]
www.nexaiot.com.tw
NexAIoT Co., Ltd.
Taichung Office
16F, No.250, Sec. 2, Chongde Rd.,
Beitun Dist.,
Taichung City 406, R.O.C.
Tel: [phone]
Fax: [phone]
Email: [email protected]
www.nexaiot.com.tw
NexCOBOT Taiwan Co., Ltd.
13F, No.916, Chung-Cheng Rd.,
ZhongHe District,
New Taipei City, 23586, Taiwan, R.O.C.
Tel: [phone]
Fax: [phone]
Email: [email protected]
www.nexcobot.com.tw
GreenBase Technology Corp.
13F, No.922,Chung-Cheng Rd.,
Zhonghe Dist.,
New Taipei City, 23586, Taiwan, R.O.C.
Tel: [phone]
Fax: [phone]
Email:[email protected]
www.nexcom.com.tw
China
NEXSEC Incorporated
5F, No.4, No.7 Fengxian Middle Rd.,
(Beike Industrial Park), Haidian District,
Beijing, 100094, China
Tel: [phone]
Fax: [phone]
Email: [email protected]
www.nexsec.cn

Copyright © 2022 NEXCOM International Co., Ltd. All Rights Reserved. xii ISA 140 User Manual
Preface
NEXGOL
1F, Building B4, Electronic 2nd Area,
(Phoenix Lake Industrial Park), Yongchuan Dist.,
Chongqing City, 402160, China
Tel: [phone]
Fax: [phone]
Email: [email protected]
www.nexgol.com/NexGoL
Beijing NexGemo Technology Co.,Ltd.
5F, Gemotech Building, No.1, Development Rd.,
Changping International Information Industry Base,
Changping District,
Beijing,102206, China
Tel: [phone]
Fax:[phone]
Japan
NEXCOM Japan
9F, Tamachi Hara Bldg.,
4-11-5, Shiba Minato-ku,
Tokyo, 108-0014, Japan
Tel: [phone]
Fax: [phone]
Email: [email protected]
www.nexcom-jp.com
NEXCOM Shanghai
No.4, 16 Building,
Shanghai OMNI Tech & Science Park
No. 1699, Douhui Rd.,
Shanghai, 201108, China
Tel: [phone]
Fax: [phone]
Email: [email protected]
www.nexcom.cn
NEXCOM Surveillance Technology Corp.
5F, Building C, ZhenHan Industrial Zone,
GanKeng Community, Buji Street,
LongGang District,
ShenZhen, 518112, China
Tel: [phone]
Fax: [phone]
Email: [email protected]
www.nexcom.cn
NEXCOM United System Service
Room 603/604, Huiyinmingzun Plaza Bldg. 1,
No. 609, Yunlin East Rd.,
Shanghai, 200062, China
Tel: [phone]
Fax: [phone]
Email: [email protected]
www.nexcom.cn
Europe
United Kingdom
NEXCOM EUROPE
10 Vincent Avenue,
Crownhill Business Centre,
Milton Keynes, Buckinghamshire
MK8 0AB, United Kingdom
Tel: [phone]
Fax: [phone]
Email: [email protected]
www.nexcom.eu
America
USA
NEXCOM USA
46665 Fremont Blvd.,
Fremont CA 94538, USA
Tel: [phone]
Fax: [phone]
Email: [email protected]
www.nexcomusa.com

Copyright © 2022 NEXCOM International Co., Ltd. All Rights Reserved. xiii ISA 140 User Manual
Preface
Package Contents
Before continuing, verify that the ISA 140 package that you received is complete. Your package should have all the items listed in the
following table.
Item Item Number Name Qty
1 T601-0000015806 (N)EPE For ISA140 Ver:A Both Squerity 230x170x102mm 1
2 T601-0000015807 (N) Outside Carton For ISA140 Ver:A Both Squerity 380x380x158mm AB FLUTE 16KG (Outside Dimension) 1

Copyright © 2022 NEXCOM International Co., Ltd. All Rights Reserved. xiv ISA 140 User Manual
Preface
Ordering Information
The following below provides ordering information for ISA 140.
Barebone
ISA 140 (P/N: 10L10014000X0)
Intel Atom®x6212RE (Elkhart Lake) processor, with 6 x 1GbE RJ45
with 1 x bypass pair

Copyright © 2022 NEXCOM International Co., Ltd. All Rights Reserved. 1ISA 140 User Manual
Chapter 1: Product Introduction
ChaPter 1: ProduCt IntroduCtIon
Key Features
▪Intel Atom®x6212RE (Elkhart Lake) industrial grade processor
▪1 x DDR4 SODIMM slot and support up to 16GB 2400/2667/3200 MT/s
▪Storage eMMC up to 8GB for OS
▪Storage M.2 Key B slot, supports 2242 for data storage
Overview
▪6 x 1GbE RJ45 with 1 x bypass pair
▪1 x M.2 3042 Key B with USB signal
▪1 x Micro SIM slot
▪1 x Minicard full size with PCIe & USB signal
▪Supports OOB

Copyright © 2022 NEXCOM International Co., Ltd. All Rights Reserved. 2ISA 140 User Manual
Chapter 1: Product Introduction
Hardware Specifications
Main Board
▪Intel Atom®x6212RE (Elkhart Lake) industrial grade processor
▪TPM 2.0 onboard
Main Memory
▪1 x DDR4 SODIMM slot support 2400/2667/3200 MT/s up to 16GB
Storage
▪Storage eMMC up to 8GB for OS
▪Storage M.2 Key B slot, support 2242 for data storage
Interface External
▪6 x 1GbE RJ45 with 1 bypass pair
- 1 port with OOB support
▪1 x Micro SIM slot
▪LED indicator for bypass/LTE/Wi-Fi/SYS/SSD/PWR
▪1 x HDMI
▪1 x Power button
▪1 x Reset button
▪1 x RJ45 for console
▪Dual terminal block
▪4 x SMA antenna holes
▪2 x USB 3.0
Interface Internal
▪1 x DDR4 SODIMM slot
▪1 x M.2 2242 Key B slot
▪1 x M.2 3042 Key B slot
▪1 x Minicard full size slot
Power Input
▪Dual DC (9~36VDC)
Dimension and Weight
▪System size: 165 x 61.7 x 129.25 mm
▪Packaging size: 305 x 245 x 195 mm
▪Weight without packaging: 1.3kg
▪Weight with packaging: 2.19kg
Environment
▪Operating temperature: -30°C~70°C:
- Up to 70°C without M.2 SSD and wireless modules
- Up to 60°C with M.2 SSD and wireless modules
▪Storage temperature: -40°C~85°C
▪Relative Humidity: 5%~95% non-condensing
Certifications
▪CE/FCC Class A

Copyright © 2022 NEXCOM International Co., Ltd. All Rights Reserved. 3ISA 140 User Manual
Chapter 1: Product Introduction
Knowing Your ISA 140 LED Indicators
Indicates the M.2 LTE, M.2 SATA, mini PCIe Wi-Fi, LAN bypass, GPIO and
power status of the system.
Power Button
Press to power-on or power-off the system.
Reset Button
Press to reset the system.
USB 3.0 Port
Used to connect USB 3.0/2.0 devices.
RJ45 Console Port
Used to connect to devices with RJ45 type console connection.
LAN 0 to LAN 5 Ports
Used to connect network devices.
HDMI
Used to connect a high-definition display.
9V to 36V DC Power Inputs
Used to plug a DC power cord.
HDMI
USB 3.0
Reset
Power
RJ 45 Console
LED Indicators
9V~36V
DC Input
LAN3 and LAN5
LAN2 and LAN4
LAN1
LAN0

Copyright © 2022 NEXCOM International Co., Ltd. All Rights Reserved. 4ISA 140 User Manual
Chapter 1: Product Introduction
Mechanical Dimensions
175.00
174.10
165.00
61.70
59.70
129.15
144.65

Copyright © 2022 NEXCOM International Co., Ltd. All Rights Reserved. 5ISA 140 User Manual
Chapter 2: Jumpers and Connectors
ChaPter 2: JumPers and ConneCtors
This chapter describes how to set the jumpers and connectors on the
ISA 140 motherboard.
Before You Begin
▪Ensure you have a stable, clean working environment. Dust and dirt can
get into components and cause a malfunction. Use containers to keep
small components separated.
▪Adequate lighting and proper tools can prevent you from accidentally
damaging the internal components. Most of the procedures that follow
require only a few simple tools, including the following:
– A Philips screwdriver
– A flat-tipped screwdriver
– A set of jewelers screwdrivers
– A grounding strap
– An anti-static pad
▪Using your fingers can disconnect most of the connections. It is
recommended that you do not use needle-nosed pliers to disconnect
connections as these can damage the soft metal or plastic parts of the
connectors.
▪Before working on internal components, make sure that the power is off.
Ground yourself before touching any internal components, by touching
a metal object. Static electricity can damage many of the electronic
components. Humid environments tend to have less static electricity than
dry environments. A grounding strap is warranted whenever danger of
static electricity exists.
Precautions
Computer components and electronic circuit boards can be damaged by
discharges of static electricity. Working on computers that are still connected
to a power supply can be extremely dangerous.
Follow the guidelines below to avoid damage to your computer or yourself:
▪Always disconnect the unit from the power outlet whenever you are
working inside the case.
▪If possible, wear a grounded wrist strap when you are working inside the
computer case. Alternatively, discharge any static electricity by touching
the bare metal chassis of the unit case, or the bare metal body of any
other grounded appliance.
▪Hold electronic circuit boards by the edges only. Do not touch the
components on the board unless it is necessary to do so. Don’t flex or
stress the circuit board.
▪Leave all components inside the static-proof packaging that they shipped
with until they are ready for installation.
▪Use correct screws and do not over tighten screws.

Copyright © 2022 NEXCOM International Co., Ltd. All Rights Reserved. 6ISA 140 User Manual
Chapter 2: Jumpers and Connectors
Jumper Settings
A jumper is the simplest kind of electric switch. It consists of two metal
pins and a cap. When setting the jumpers, ensure that the jumper caps are
placed on the correct pins. When the jumper cap is placed on both pins, the
jumper is short. If you remove the jumper cap, or place the jumper cap on
just one pin, the jumper is open.
Refer to the illustrations below for examples of what the 2-pin and 3-pin
jumpers look like when they are short (on) and open (off).
Two-Pin Jumpers: Open (Left) and Short (Right)
Three-Pin Jumpers: Pins 1 and 2 are Short
1
2
3
1
2
3