RISC-based mobile Linux computer with cellular, Wi-Fi, and GPS modules, 2 Ethernet, 2 serial, 2 USB 2.0 ports, & 2 mini PCIe sockets

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Features and BenefitsMoxa UC-8100 Wireless Computer Product Review

  • Intel XScale IXP435 533 MHz processor
  • 512 MB DDR2 SDRAM
  • 512 MB NAND Flash for data storage
  • 32 MB NOR Flash to store OS 
  • Fanless and rugged design for rolling stock applications that require EN 50155 standards
  • Extra Wi-Fi and cellular slots for cross-operator expansions
  • Wi-Fi, Cellular, and GPS modules for full communications mobility
  • Independent, software-based power control of cellular modules
  • Ready-to-run embedded Linux operating system
  • -25 to 70°C wide temperature models available


The UC-8481 embedded computer comes with 2 RS-232/422/485 serial ports, 2 Ethernet ports, 4 digital input channels, 4 digital output channels, a CompactFlash socket, and 2 USB 2.0 ports.


The computer uses the Intel XScale IXP435 533 MHz RISC CPU. This powerful computing engine supports several useful communication functions, but will not generate too much heat. The built-in 32 MB NOR Flash ROM and 512 MB SDRAM give you enough memory to run your application software directly on the UC-8481, and the 512 MB NAND Flash can be used to provide additional data storage.


Mostly importantly, the UC-8481 series comes with seven connectors that allow users to connect various wireless and GPS modules, making it particularly well-suited for rolling stock and moving vehicles. The UC-8481 is a convenient cornerstone for customizing intelligent, cost-effective wireless communication platforms.


With an embedded Linux operating system pre-installed, the UC-8481 series provides an open software platform perfect for custom-authored software. Software written on desktop PCs can be easily ported to the UC-8481 via a common compiler, without any modification of code. This makes the UC-8481 an optimal solution for industrial applications, allowing ample customization with minimal cost and effort.


In addition, the UC-8481 comes in a wide-temperature model designed to operate reliably in extremes from -25° to 70° C.

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Hardware Specifications
CPU Intel XScale IXP435, 533 MHz
OS (pre-installed) Linux
DRAM 512 MB DDR2 SDRAM onboard
Flash 32 MB NOR Flash onboard to store OS
512 MB NAND Flash, up to 1 GB for OS file system, caching storage, and data logger
USB USB 2.0 hosts x 2
Storage Expansion CompactFlash socket
Ethernet Interface
LAN 2 auto-sensing 10/100 Mbps ports (M12)
Magnetic Isolation Protection 1.5 kV built in
GPS Module (U-Blox LEA-6S)
Receiver Types • 50-channel U-blox 6 engine
• GPS L1 C/A code
Acquisition • Cold starts 28s
• Warm starts: 28s
• Aided starts: 1s
• Hot starts: 1s
Sensitivity • Tracking -160 dBm
• Reacquisition: -160 dBm
• Cold starts: -147 dBm
Timing accuracy • RMS 30 ns
• 99%: <60 ns
• Granularity: 21 ns
Accuracy • Position 2.5m CEP
• SBAS: 2.0m CEP
Protocols NMEA, UBX binary, max. update rate: 5Hz (ROM version )
Time Pulse 0.25Hz to 1KHz
Velocity Accuracy 0.1 m/s
Heading Accuracy 0.5 degrees
A-GPS Supports AssistNow Online and AssistNow Offline, OMA SUPL compliant
Operational Limits Velocity:500m/s(972 knots)
Connector Type TNC
WLAN Module (Atheros AR9220)
WAPN001 IEEE802.11a/b/g/n wireless LAN module with U.FL antenna connector
Standards IEEE802.11a/b/g/n for wireless LAN
Connector Type QMA connector (female type) x 2
Mode Client
Cellular Module (Cinterion PH8)
Band Options • Five band UMTS(WCDMA/FDD)
• 800/850/1900 AWS and 2100 MHz
• Quad-band GSM: 850/900/1800/1900 MHz
HSDPA/HSUPA Data Rates DL: 3.6/7.2/14.4 Mbps; UL: 2.0/5.76 Mbps
UMTS Data Rates DL: max 384 kbps; UL: max 384 kbps
EDGE Class 12 DL: max 237 kbps; UL: max 237 kbps
GPRS Class 12 DL: max 85.6 kbps; UL: max 85.6 kbps
Connector Type QMA connector (female type) x 1
Serial Interface
Serial Standards 2 RS-232/422/485 ports, software-selectable (DB9)
Console Port RS-232 (TxD, RxD, GND), 4-pin pin header output (115200, n, 8, 1)
Serial Communication Parameters
Data Bits 5, 6, 7, 8
Stop Bits 1, 1.5, 2
Parity None, Even, Odd, Space, Mark
Flow Control RTS/CTS, XON/XOFF, ADDC® (automatic data direction control) for RS-485
Baudrate 50 bps to 921.6 kbps (supports non-standard baudrates; see user’s manual for details)
Serial Signals
RS-422 TxD+, TxD-, RxD+, RxD-, GND
RS-485-4w TxD+, TxD-, RxD+, RxD-, GND
RS-485-2w Data+, Data-, GND
Digital Input
Input Channels 4, source type
Input Voltage 0 to 30 VDC
Digital Input Levels for Dry Contacts • Logic level 0: Close to GND
• Logic level 1: Open
Digital Input Levels for Wet Contacts • Logic level 0: +3 V max.
• Logic level 1: +10 V to +30 V (COM to DI)
Connector Type 10-pin screw terminal block (4 points, COM, GND)
Isolation 2 kV optical isolation
Digital Output
Output Channels 4, sink type
Output Current Max. 200 mA per channel
On-state Voltage 24 VDC nominal, open collector to 30 V
Connector Type 10-pin screw terminal block (4 points, GND)
System Power, Ready, Storage, Programmable
LAN 10M/Link x 2, 100M/Link x 2 (on connector)
Serial TxD x 2, RxD x 2
Reset Button Supports “Reset to Factory Default”
Physical Characteristics
Housing SECC sheet metal (1 mm)
Weight 1 kg
Dimensions 200 x 57 x 120 mm (7.87 x 2.24 x 4.72 in)
Mounting DIN rail, wall
Environmental Limits
Operating Temperature Standard Models: -25 to 55°C (-13 to 131°F)
Wide Temp. Models: -25 to 70°C (-13 to 158°F)
Storage Temperature Standard Models: -25 to 75°C (-13 to 167°F)
Wide Temp. Models: -40 to 80°C (-40 to 176°F)
Ambient Relative Humidity 5 to 95% (non-condensing)
Anti-vibration IEC 61373 standard
Anti-shock IEC 61373 standard
Power Requirements
Input Voltage 24 VDC (9 to 48 V), M12 connector
Power Consumption 20 W
• 833 mA @ 24 VDC
Standards and Certifications
Safety UL 60950-1, EN 60950-1
EMC EN 55022 Class B, EN 55024-4-2, EN 55024-4-3, EN 55024-4-4, FCC Part 15 Subpart B Class B
Rail Traffic EN 50155*, EN 50121-2-3, EN 50121-4, IEC 61373
Note *Complies with a portion of EN 50155 specifications. Please contact Moxa or a Moxa distributor for details.
Alert Tools Built-in buzzer and RTC (real-time clock)
Automatic Reboot Trigger Built-in WDT (watchdog timer)
Warranty Period 5 years (does not apply to cellular module)
Details See www.moxa.com/warranty
Note These hardware specifications describe the embedded computer unit itself, but not its official accessories. In particular, the wide temperature specification does not apply to accessories such as power adaptors and cables.
Software Specifications
OS Linux 2.6.38
File System JFFS2, NFS, Ext2, Ext3, YAFFS2
Internet Protocol Suite TCP, UDP, IPv4, IPv6, SNMPv1, ICMP, ARP, HTTP, CHAP, PAP, DHCP, NTP, NFS, SMTP, Telnet, FTP, TFTP, PPP, PPPoE
Internet Security OpenVPN, iptables firewall, OpenSSL
Web Server (Apache) Allows you to create and manage web sites; supports PHP and XML
Terminal Server (SSH) Provides secure encrypted communications between two un-trusted hosts over an insecure network
Dial-up Networking PPP Daemon for Linux that allows Unix machines to connect to the Internet through dialup lines, using the PPP protocol, as a PPP server or client. Works with ‘chat’, ‘dip’, and ‘diald’, among (many) others. Supports IP, TCP, UDP, and (for Linux) IPX (Novell).
Watchdog Features a hardware function to trigger system reset in a user specified time interval (Moxa API provided)
Wireless wpa_supplicant is configured using a text file that lists all accepted networks and security policies, including pre-shared keys.
GPS gpsd is a daemon that receives data from a GPS receiver, and provides the data back to multiple applications such as Kismet or GPS navigation software.
Application Development Software • Moxa API Library (Watchdog timer, Moxa serial I/O control, Moxa DI/DO API)
• GNU C/C++ cross-compiler, supports EABI
• GNU C library
• GDB source-level debugging server
Software Protection Encryption tool for user executable files (based on patented Moxa technology)

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Available Models

  Model No. Description
UC-8481-LX RISC-based industrial wireless mobile computer with 2 LANs, 2 serial ports, 4 DIs, 4 DOs, 2 USB 2.0 hosts, CF, 1 cellular module, 1 Wi-Fi module, 1 GPS module, 2 Mini PCIe sockets (USB interface), Linux OS, -25 to 55°C operating temperature (EN 50155 Class T1)
UC-8481-T-LX RISC-based industrial wireless mobile computer with 2 LANs, 2 serial ports, 4 DIs, 4 DOs, 2 USB 2.0 hosts, CF, 1 cellular module, 1 Wi-Fi module, 1 GPS module, 2 Mini PCIe sockets (USB interface), Linux OS, -25 to 70°C operating temperature (EN 50155 Class T3)
UC-8481 Wi-Fi Accessory Package ● WAPN001: Wireless LAN module, supporting IEEE 802.11 a/b/g/n ● Wireless Antenna Connector and Cable: QMA (Female) antenna connector with 140 mm cable to Wi-Fi module ● Installation Kit: Bronze screws x 3, M2.5 screws x 3, thermal pad x 1
UC-8481 PH8 Cellular Accessory Package ● EPM-PH8: Cellular Module ● Wireless Antenna Connector and Cable: QMA (Female) antenna connector with 140 mm cable to cellular module ● Installation Kit: Bronze screw x 1, M2.5 screw x 1, thermal pad x 1

Optional Accessories

Power Cords
  Model No. Description
CBL-M12(FF5P)/Open-100 IP67 1-meter A-coded M12-to-5-pin power cable, 5-pin female M12 connector, IP67-rated
Connection Cables
  Model No. Description
CBL-M12D(MM4P)/RJ45-100 IP67 1-meter D-coded M12-to-RJ45 Cat-5C UTP Ethernet cable, 4-pin male M12 connector, IP67-rated
Wireless Antenna Cable
  Model No. Description
A-CRF-RFQMAM-R2-50 QMA (male) to RP-SMA (male), 0.5 m
  Model No. Description
M12D-4P-IP68 Field-installation D-coded screw-in Ethernet connector, 4-pin male M12 connector, IP68-rated
Computing Hardware Accessories
  Model No. Description
A-CRF-QMAMSF-R2-50 QMA (male) to SMA (male) adapter with 50 cm cable
  Model No. Description
A-CRF-CTPSF-R2-50 TNC to SMA (female) adapter with 50 cm cable
Adaptors / Power Cords
  Model No. Description
PWR-24250-DT-S1 Power adaptor
PWC-C7US-2B-183 Power cord with 2-pin connector, USA plug
PWC-C7EU-2B-183 Power cord with 2-pin connector, Euro plug
PWC-C7UK-2B-183 Power cord with 2-pin connector, British plug
PWC-C7AU-2B-183 Power cord with 2-pin connector, Australia plug
PWC-C7CN-2B-183 Power cord with 2-pin connector, China plug

Professional Design Service


Moxa’s customization service for industrial computing products is based on the Professional Design Service (PDS) concept, which aims to provide customers with tailor-made solutions. Industrial applications often have specific requirements, and specialized solutions are often needed. With more than 20 years of experience in the industrial networking and automation field, Moxa can offer professional, customized products and services that are ideal for your own industrial applications.

Customer Benefits
• Comprehensive consideration of platform system design gives optimal solutions, and guarantees that proposals address customer needs
• Our sophisticated customization procedures are built on meticulous production and quality control processes
•  A full-time technical support team gives customers quick and reliable solutions