Nexcom nROK 7251 Series User manual

NEXCOM International Co., Ltd.
NEXCOM International Co., Ltd.
Published March 2021 www.nexcom.com
Mobile Computing Solutions
Railway Computer
nROK 7251 Series
User Manual

Copyright © 2020 NEXCOM International Co., Ltd. All Rights Reserved. ii
Contents
nROK 7251 Series User Manual
Contents
Preface
Copyright ............................................................................................... v
Disclaimer............................................................................................... v
Acknowledgements ................................................................................ v
Regulatory Compliance Statements......................................................... v
Declaration of Conformity....................................................................... v
RoHS Compliance .................................................................................. vi
Warranty and RMA ................................................................................vii
Technical Support and Assistance............................................................ x
Conventions Used in this Manual............................................................ x
Global Service Contact Information........................................................ xi
Package Contents.................................................................................xiii
Ordering Information .............................................................................xv
Chapter 1: Product Introduction
nROK 7251-7C4 Physical Features...........................................................1
Front View...........................................................................................1
Rear View............................................................................................1
nROK 7251-7A Physical Features.............................................................2
Front View...........................................................................................2
Rear View............................................................................................2
nROK 7251-WI-7C4IP Physical Features...................................................3
Front View...........................................................................................3
Rear View............................................................................................3
nROK 7251 Series Hardware Specifications .............................................4
Connector Numbering ............................................................................7
nROK 7251-7C4 Front View ................................................................7
nROK 7251-7C4 Rear View .................................................................7
nROK 7251-7A Front View ..................................................................8
nROK 7251-7A Rear View ...................................................................8
nROK 7251-WI-7C4IP Front View ........................................................9
nROK 7251-WI-7C4IP Rear View .........................................................9
Chapter 2: External Connectors Pinout Description
Power LED.........................................................................................10
Reset Button......................................................................................10
LED Indicators (nROK 7251-7C4/7251-WI-7C4IP)...............................11
LED Indicators (nROK 7251-7A) .........................................................11
SIM1-1/1-2 to SIM4-1/4-2 Mini-SIM Sockets ......................................12
USB 3.1 Ports ....................................................................................12
M12 Audio Connector ......................................................................13
HDMI Connector ...............................................................................13
M12 LAN1/2 Connectors (LAN2 for nROK 7251-7A)..........................14
PoE1 to PoE4 M12 Connectors
(nROK 7251-7C4 and nROK 7251-WI-7C4IP).....................................14
VGA Connector.................................................................................15
M12 USB 2.0 Connector....................................................................15
DIO Connector ..................................................................................16
COM1 RS232 Connector...................................................................16
COM2 RS232 Connector...................................................................17
COM3 RS232/RS422/RS485 Connector .............................................17
DC Input (nROK 7251-WI-7C4IP).......................................................18
DC Input (nROK 7251-7C4 and nROK 7251-7A)................................18

Copyright © 2020 NEXCOM International Co., Ltd. All Rights Reserved. iii
Contents
nROK 7251 Series User Manual
Chapter 3: Jumpers and Switches
Before You Begin ..................................................................................19
Precautions ...........................................................................................19
Jumper Settings ....................................................................................20
nROK 7251 Series Connector Specification & Jumper Setting ................21
Locations of the Jumpers and Connectors for the Carrier Board.........21
DIP Switch and Jumper Settings.........................................................22
RTC Clear Selection........................................................................22
Input Voltage Setup Selection.........................................................22
GPIO Pull Power.............................................................................23
Internal Connectors...........................................................................24
GPS Wire to Board Connector........................................................24
GPS Wafer Connector ....................................................................24
GPS Battery Connector...................................................................25
GPS DR In Connector .....................................................................25
RTC Battery Connector...................................................................26
GPIO Connector.............................................................................26
COM1 RS232 DB9 Connector ........................................................27
COM2 RS232 DB9 Connector ........................................................27
COM3 RS232/RS422/RS485 DB9 Connector...................................28
USB Connectors (Reserved) ............................................................28
USB Connector (For USB M12 Connector)......................................29
SATA Connectors ...........................................................................29
MCU Debug Port ...........................................................................30
MCU Download Port......................................................................30
DC IN Connector............................................................................31
Audio Connectors..........................................................................31
VGA Connector .............................................................................32
SIM1-1/SIM1-2 to SIM4-1/SIM4-2 Mini-SIM Slots............................32
M.2 3042/3050/3052 Key B Socket (USB 2.0, USB 3.1 Gen2)
for LTE/5G NR Module with 2 x External SIM .................................33
M.2 3042/3050/3052 Key B Socket (USB 2.0, USB 3.1 Gen2)
for LTE/5G NR Module with 2 x External SIM .................................34
Full Size Mini-PCIe Socket (USB 2.0)
for LTE Module with 2 x External SIM ............................................35
(BOM Optional)
M.2 3042 Key B Socket (USB 2.0, USB 3.1 Gen2)
for LTE/5G NR Module with 2 x External SIM .................................36
Full Size Mini-PCIe Socket
(USB 2.0, PCIe 3.0/SATA 3.0 [BIOS Selection]).................................37
Full Size Mini-PCIe Socket
(USB 2.0, PCIe 3.0/SATA 3.0 [BIOS Selection]).................................38
Chapter 4: System Setup
Removing the Chassis Cover ................................................................39
Installing a SSD/HDD Drive ....................................................................43
Installing a SO-DIMM Memory Module .................................................45
Removing the Storage Trays Before Installing Modules ..........................48
Installing a WLAN Module.....................................................................50
Installing a WWAN Module (Mini-PCIe) .................................................50
Installing a WWAN Module (M.2)..........................................................51
Installing an mSATA Module .................................................................53
Installing a GPS Module ........................................................................53
Inserting the SIM Cards.........................................................................54
Appendix A: Software Demo Utility for I/O Ports of
Function Control
Menu Screen ........................................................................................55
1. System 1 ......................................................................................55
2. System 2 ......................................................................................57
3. I/O ...............................................................................................58
4. Module ........................................................................................60

Copyright © 2020 NEXCOM International Co., Ltd. All Rights Reserved. iv
Contents
nROK 7251 Series User Manual
5. G-Sensor ......................................................................................62
6. PoE (nROK 7251-7C4 and nROK 7251-WI-7C4IP).........................63
7. Event............................................................................................64
Appendix B: GPS Feature
uBlox-NEO M8 Overview.......................................................................65
Technical Specifications.........................................................................65
Appendix C: GPS with Dead Reckoning Feature
uBlox-NEO M8L Overview .....................................................................67
Technical Specifications.........................................................................68
Appendix D: Signal Connection of MCU DI/DO
GPIO Pinout Description........................................................................70
Digital Input..........................................................................................71
Digital Output.......................................................................................72
Appendix E: Vehicle Power Management/
CN16 WLAN/mSATA Setup
Power-on Delay Setting.........................................................................74
Power-off Delay Setting ........................................................................76
CN16 Signal Setting..............................................................................78
Appendix F: Pin Definition for the Multiport Cable
P1 Connector Pinout.............................................................................80
P2 Connector Pinout.............................................................................80
GPIO Connector ................................................................................80
P2 Connector Pinout.............................................................................82
P1 and P3 Connector Pinouts................................................................82
Green (Line-out) Connector...............................................................82
Pink (Mic-in) Connector.....................................................................83
CN1 Connector Pinout..........................................................................85
CN2 and CN3 Connector Pinouts..........................................................85
USB Connector..................................................................................85
USB Connector..................................................................................86
Appendix G: Power Consumption ........................87

Copyright © 2020 NEXCOM International Co., Ltd. All Rights Reserved. v
Preface
nROK 7251 Series User Manual
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
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
nROK 7251-WI-7C4IP, nROK 7251-7C4 and nROK 7251-7A are trademarks
of NEXCOM International Co., Ltd. All other product names mentioned
herein are registered trademarks of their respective owners.
PrefaCe

Copyright © 2020 NEXCOM International Co., Ltd. All Rights Reserved. vi
Preface
nROK 7251 Series User Manual
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.
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 © 2020 NEXCOM International Co., Ltd. All Rights Reserved. vii
Preface
nROK 7251 Series User Manual
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.
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.
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 © 2020 NEXCOM International Co., Ltd. All Rights Reserved. viii
Preface
nROK 7251 Series User Manual
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.
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.
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 recom-
mended that you do not use needlenose pliers to disconnect connections
as these can damage the soft metal or plastic parts of the connectors.
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. CompactFlash: Turn off the unit’s power before inserting or removing a
CompactFlash storage card.
4. SIM: Do not insert or remove the SIM card when the system is powered
on. Always power off the system before inserting or removing the SIM
card.

Copyright © 2020 NEXCOM International Co., Ltd. All Rights Reserved. ix
Preface
nROK 7251 Series User Manual
Safety Precautions
▪Read these safety instructions carefully.
▪Keep this User Manual for later reference.
▪Disconnect this equipment from any AC outlet before cleaning. Use a
damp cloth. Do not use liquid or spray detergents for cleaning.
▪For plug-in equipment, the power outlet socket must be located near the
equipment and must be easily accessible.
▪Keep this equipment away from humidity.
▪Put this equipment on a stable surface during installation. Dropping it or
letting it fall may cause damage.
▪Do not leave this equipment in either an unconditioned environment or
in a above 40oC storage temperature as this may damage the equipment.
▪The openings on the enclosure are for air convection to protect the
equipment from overheating. DO NOT COVER THE OPENINGS.
▪Make sure the voltage of the power source is correct before connecting
the equipment to the power outlet.
▪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.
▪All cautions and warnings on the equipment should be noted.
▪If the equipment is not used for a long time, disconnect it from the power
source to avoid damage by transient overvoltage.
▪Never pour any liquid into an opening. This may cause fire or electrical
shock.
▪Never open the equipment. For safety reasons, the equipment should be
opened only by qualified service personnel.
▪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.
▪Do not place heavy objects on the equipment.
▪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.
▪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 © 2020 NEXCOM International Co., Ltd. All Rights Reserved. x
Preface
nROK 7251 Series User Manual
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.
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.

Copyright © 2020 NEXCOM International Co., Ltd. All Rights Reserved. xi
Preface
nROK 7251 Series User Manual
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 Headquarters
Industry 4.0 and Cloud Services
13F, No.916, Zhongzheng Rd.,
Zhonghe District, New Taipei City,
23586, Taiwan, R.O.C.
Tel: [phone]
Fax: [phone]
Email: [email protected]
www.nexaiot.com
NexAIoT Co., Ltd.
Taichung Office
16F, No.250, Sec. 2, Chongde Rd.,
Beitun District,
Taichung City, 406, Taiwan, R.O.C.
Tel: [phone]
Fax: [phone]
Email: [email protected]
www.nexaiot.com
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
GreenBase Technology Corp.
13F, No.922, Chung-Cheng Rd.,
Zhonghe District,
New Taipei City, 23586, Taiwan, R.O.C.
Tel: [phone]
Fax: [phone]
Email: [email protected]
www.nexcom.com.tw
EMBUX Technology 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.nexcom.com.tw
TMR Technology Corp.
13F, No.916, Chung-Cheng Rd.,
Zhonghe District,
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
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

Copyright © 2020 NEXCOM International Co., Ltd. All Rights Reserved. xii
Preface
nROK 7251 Series User Manual
NexCOBOT China
Room 501, Building 1, Haichuang Building,
No.7 Qingyi Road, Guicheng Street,
Nanhai District, Foshan City,
Guangdong Province, 528314, China
Tel: [phone]
Email: [email protected]
www.nexcobot.com.cn
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]
Email: [email protected]
www.nexgemo.cn
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 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
NEXGOL Chongqing
1F, Building B4, Electronic 2nd Area,
(Phoenix Lake Industrial Park), Yongchuan Dist.,
Chongqing City, 402160, China
Tel: [phone]
Fax: [phone]
Email: [email protected]
www.nexcobot.com/NexGOL
America
USA
NEXCOM USA
46665 Fremont Blvd.,
Fremont CA 94538, USA
Tel: [phone]
Fax: [phone]
Email: [email protected]
www.nexcomusa.com
NexCOBOT USA
2883 Bayview Drive,
Fremont CA 94538, USA
Tel: [phone]
Fax: [phone]
Email: [email protected]
www.nexcobot.com
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.co.uk

Copyright © 2020 NEXCOM International Co., Ltd. All Rights Reserved. xiii
Preface
nROK 7251 Series User Manual
Package Contents
Before continuing, verify that the nROK 7251-7C4/nROK 7251-7A and
nROK 7251-WI-7C4IP package that you received is complete. Your nROK
7251-7C4/nROK 7251-7A and nROK 7251-WI-7C4IP package should have
all the items listed in their respective tables below.
nROK 7251-7C4/nROK 7251-7A
Item P/N Name Specification Qty
1 50311F0581X00 I Head Bolts Screw Long Fei:I3x15.8 ISO NIGP I3x5.8 AXISx2.8mm SCREWx3mm 8
2 50333P0027X00 Washer for SMA CONN Kang Yang:TW-181 13x1.8mm Nylon 66 Natural 10
3 50333P0028X00 Washer for SMA CONN Kang Yang:WS6-0.8(B) 12.8x6.4x0.8mm PC Black 10
4 6012200052X00 PE Zipper Bag #8 170x240mm, w/China RoHS Symbol 1
5 6012200053X00 PE Zipper Bag #3 100x70mm, w/China RoHS Symbol 1
6 602DCD1662X00 nROK 7251 Series DVD Driver VER:1.0 JCL 1
7 603ANT0115X00 GPS/GLONASS Antenna SANAV:SM-76G SMA Male L=5000mm 1
8 603POW0378X00 Power Cable ST:MD-5108077 Waterproof M12 A Coded 5-pin (Female) to Open
L=300mm 1

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Preface
nROK 7251 Series User Manual
nROK 7251-WI-7C4IP
Item P/N Name Specification Qty
1 50311F0581X00 I Head Bolts Screw Long Fei:I3x15.8 ISO NIGP I3x5.8 AXISx2.8mm SCREWx3mm 8
2 50333P0027X00 Washer for SMA CONN Kang Yang:TW-181 13x1.8mm Nylon 66 Natural 10
3 50333P0028X00 Washer for SMA CONN Kang Yang:WS6-0.8(B) 12.8x6.4x0.8mm PC Black 10
4 6012200052X00 PE Zipper Bag #8 170x240mm, w/China RoHS Symbol 1
5 6012200053X00 PE Zipper Bag #3 100x70mm, w/China RoHS Symbol 1
6 602DCD1662X00 nROK 7251 Series DVD Driver VER:1.0 JCL 1
7 603ANT0115X00 GPS/GLONASS Antenna SANAV:SM-76G SMA Male L=5000mm 1
8 603POW0407X00 Power Cable ST:ST-2005011 Waterproof M23 5-pin (Female) to Open L=300mm 1

Copyright © 2020 NEXCOM International Co., Ltd. All Rights Reserved. xv
Preface
nROK 7251 Series User Manual
Ordering Information
The following provides ordering information for the nROK 7251 series.
▪nROK 7251-WI-7C4IP (P/N: 10A00725100X0)
9th generation Intel®Core™ i7-9700TE, 2 x 4 GB industrial grade
memory, DC input 24V~110V w/ isolation, 1 x VGA, 1 x LAN, 4 x PoE
802.3af/at (total 60W), IP65
▪nROK 7251-7C4 (P/N: 10A00725101X0)
9th generation Intel®Core™ i7-9700TE, 2 x 4 GB industrial grade
memory, DC input 24V w/o isolation, 1 x VGA, 1 x HDMI, 1 x LAN,
4 x PoE 802.3af/at (total 60W)
▪nROK 7251-7A (P/N: 10A00725103X0)
9th generation Intel®Core™ i7-9700TE, 2 x 4 GB industrial grade
memory, DC input 24V w/o isolation, 1 x VGA, 1 x HDMI, 2 x LAN

Copyright © 2020 NEXCOM International Co., Ltd. All Rights Reserved. 1
Chapter 1: Product Introduction
nROK 7251 Series User Manual
ChaPter 1: ProduCt IntroduCtIon
nROK 7251-7C4 Physical Features
Front View
SSD/HDD
USB 3.1
SSD/HDD
6 SIM Slots
with Cover
Power
LED
Reset
Button
Antenna
Connectors
Antenna
Connectors
Antenna
Connector
LED
Indicators
Rear View
VGA
LAN
DIO COM1 COM2 COM3USB 2.0
HDMI
DC
Input
Power
Button
Audio PoE1 to PoE4

Copyright © 2020 NEXCOM International Co., Ltd. All Rights Reserved. 2
Chapter 1: Product Introduction
nROK 7251 Series User Manual
nROK 7251-7A Physical Features
Front View
SSD/HDD
USB 3.1
SSD/HDD
6 SIM Slots
with Cover
Power
LED
Reset
Button
Antenna
Connectors
Antenna
Connectors
Antenna
Connector
LED
Indicators
Rear View
VGA
LAN1 LAN2
DIO COM1 COM2 COM3 USB 2.0
HDMI
DC
Input
Power
Button
Audio

Copyright © 2020 NEXCOM International Co., Ltd. All Rights Reserved. 3
Chapter 1: Product Introduction
nROK 7251 Series User Manual
nROK 7251-WI-7C4IP Physical Features
Front View
SSD/HDD
USB 3.1
SSD/HDD
6 SIM Slots
with Cover
Power
Button
Reset
Button
Antenna
Connectors
Antenna
Connector
LED
Indicators
Rear View
VGA
LAN
DIO
COM1 COM2 COM3
USB 2.0
DC
Input
Audio PoE1 to PoE4

Copyright © 2020 NEXCOM International Co., Ltd. All Rights Reserved. 4
Chapter 1: Product Introduction
nROK 7251 Series User Manual
CPU
▪Support 9th/8th generation Intel®Core™ i7/i5/i3 processor, LGA1151 socket
- Intel®Core™ i7-9700TE, TDP 35W
Chipset
▪Intel®Q370 platform controller hub
Memory
▪2-Channel 260-pin DDR4 SO-DIMM sockets up to 32GB/channel
(64GB for two channels, non-ECC up to 2666 MHz), default 4GB + 4GB
industrial grade memory
Video Output
▪Chipset Intel®UHD Graphics 630
▪1 x Waterproof VGA up to 1920 x 1200 @ 60Hz
▪1 x HDMI 1.4b up to 4096 x 2160 @ 30Hz (nROK 7251-7C4, nROK 7251-7A)
Storage
▪2 x 2.5” SATA 3.0 external SSD/HDD (compatible with 15mm height),
RAID 0/1 supported
▪2 x mSATA 3.0 (BIOS selection, occupied by mPCIe slot)
Expansion
▪1 x Full size mini-PCIe socket (USB 2.0, PCIe 3.0/SATA 3.0 [BIOS selection])
▪1 x Full size mini-PCIe socket (USB 2.0, PCIe 3.0/SATA 3.0 [BIOS selection]),
BOM optional full size mini-PCIe socket (USB 2.0) for LTE module with 2 x
external SIM
▪1 x Full size mini-PCIe socket (USB 2.0) for LTE module, BOM optional M.2
3042 Key B socket (USB 2.0, USB 3.1 Gen2) for LTE/5G NR module with 2 x
external SIM
▪1 x M.2 3042/3050/3052 Key B socket (USB 2.0, USB 3.1 Gen2) for LTE/5G
NR module with 2 x external SIM
▪1 x M.2 3042/3050/3052 Key B socket (USB 2.0, USB 3.1 Gen2, PCIe 3.0
[BOM optional]) for LTE/5G NR modem with 2 x external SIM
GNSS and Onboard Sensor
▪1 x Default U-blox NEO-M8N GNSS module for GPS/Glonass/QZSS/
Galileo/Beidou
▪Optional modules with dead reckoning available
▪G Sensor (3-axis, 10-bit resolution)
LAN and Power over Ethernet
▪nROK 7251-WI-7C4IP, nROK 7251-7C4
- 4 x Independent LAN, 10/100/1000 Mbps I210-IT GbE, PoE 802.3af/at,
max. 60W
- 1 x LAN, 10/100/1000 Mbps I219 support iAMT and WOL
▪nROK 7251-7A
- 2 x LAN, 10/100/1000 Mbps I210/I219 (support iAMT and WOL)
Security
▪TPM 2.0: Infineon SLB9665TT2.0FW5.62 (BOM optional)
I/O Interface-Front
▪nROK 7251-WI-7C4IP, nROK 7251-7C4
- 21 x LED indicators (including 4 x programmable LED)
▪nROK 7251-7A
- 14 x LED indicators (including 4 x programmable LED)
▪6 x Externally accessible SIM card sockets (4 x WWAN + 8 x SIM, BOM
optional) w/ cover
nROK 7251 Series Hardware Specifications

Copyright © 2020 NEXCOM International Co., Ltd. All Rights Reserved. 5
Chapter 1: Product Introduction
nROK 7251 Series User Manual
▪1 x Reset button
▪2 x 2.5” external SSD/HDD
▪12 x SMA antenna holes
▪nROK 7251-WI-7C4IP
- 3 x USB 3.1 Gen1 Type A (5V/1A) w/ cover
- 1 x USB 3.1 Gen2 Type A (5V/1A) w/ cover
▪nROK 7251-7C4, nROK 7251-7A
- 3 x USB 3.1 Gen1 Type A (5V/1A)
- 1 x USB 3.1 Gen2 Type A (5V/1A)
I/O Interface-Rear
▪nROK 7251-WI-7C4IP, nROK 7251-7C4:
- 4 x M12 X-coded PoE 802.3af/at, max. 60W
- 1 x M12 X-coded LAN port, 10/100/1000 Mbps
▪nROK 7251-7A:
- 2 x M12 X-coded LAN port, 10/100/1000 Mbps
▪1 x Waterproof DC input connector with ignition, male type
▪1 x M8 for 1 x Mic-in, 1 x Line-out
▪2 x Waterproof DB9 (COM1/COM2) for full RS232 (isolation)
▪1 x Waterproof DB9 (COM3) for full RS232/422/485 (isolation)
▪1 x M12 A-coded 10-pin (DIO)
- 4 x DI and 4 x DO (isolation)
- Power in for DIO isolation, 9~36VDC
▪1 x M12 A-coded for 2 x USB 2.0
▪1 x VGA
▪1 x HDMI (nROK 7251-7C4, nROK 7251-7A)
Power Management & Software Support
▪nROK 7251-WI-7C4IP: power input 24~110 VDC w/ isolation
▪nROK 7251-7C4, nROK 7251-7A: power input 24 VDC w/o isolation
▪Reverse protection, OCP & UVP
▪Selectable boot-up & shut-down voltage for low power protection by
software
▪Setting 8-level power on/off delay time by software
▪10~255 seconds WDT support, setup by software
▪SDK (Windows/Linux) including utility and sample code
Operating System
▪Windows 10
▪Linux
Dimensions
▪nROK 7251-WI-7C4IP: 260 x 256 x 110 (W x D x H) (mm)
▪nROK 7251-7C4, nROK 7251-7A: 260 x 256 x 84 (W x D x H) (mm)
Weight
▪nROK 7251-WI-7C4IP: 6.5kg
▪nROK 7251-7C4: 4.6kg
▪nROK 7251-7A: 4.3kg
Environment
▪Operating temperatures
- EN 50155, class OT4 (-40~70°C), 85°C for 10 minutes (w/ 35W TDP
CPU, industrial SSD) with air flow
▪Storage temperatures: -40°C~80°C
▪Relative humidity: 90% (non-condensing)
▪Vibration (random)
- 2g@5~500 Hz (in operation, SSD)
▪Vibration (SSD)
- Operating: MIL-STD-810G, Method 514.6, Category 4, common
carrier US highway truck vibration exposure