US Robotics Courier USR3500 Reference Manual
Courier M2M 3G Cellular Modem
USR3500
Reference Guide
Rev 1.0 1/27/14 2
Reference Guide
Important Notice
Due to the nature of wireless communications, transmission and reception of data
can never be guaranteed. Data may be delayed, corrupted (i.e., have errors) or be
totally lost. Although significant delays or losses of data are rare when wireless
devices are used in a normal manner with a well-constructed network, the modem
should not be used in situations where failure to transmit or receive data could result
in damage of any kind to the user or any other party, including but not limited to
personal injury, death, or loss of property. Neither Sierra Wireless nor USRobotics
accepts any responsibility for damages of any kind resulting from delays or errors in
data transmitted or received using the modem, or for failure of the modem to transmit
or receive such data.
Safety and Hazards
Do not operate the modem in areas where cellular modems are not advised without
proper device certifications. These areas include environments where cellular radio
can interfere such as explosive atmospheres, medical equipment, or any other
equipment which may be susceptible to any form of radio interference. The modem
can transmit signals that could interfere with this equipment. Do not operate the
modem in any aircraft, whether the aircraft is on the ground or in flight. In aircraft, the
modem MUST BE POWERED OFF. When operating, the modem can transmit
signals that could interfere with various onboard systems.
Note: Some airlines may permit the use of cellular phones while the aircraft is on the ground and the door
is open. Modems may be used at this time.
The driver or operator of any vehicle should not operate the modem while in control
of a vehicle. Doing so will detract from the driver or operator’s control and operation
of that vehicle. In some states and provinces, operating such communications
devices while in control of a vehicle may be an offence.
Limitations of Liability
This manual is provided “as is”. Neither Sierra Wireless nor USRobotics makes any
warranties of any kind, either expressed or implied, including any implied warranties
of merchantability, fitness for a particular purpose, or noninfringement. The recipient
of the manual shall endorse all risks arising from its use.
The information in this manual is subject to change without notice and does not
represent a commitment on the part of Sierra Wireless or USRobotics. EACH OF
SIERRA WIRELESS AND USROBOTICS AND THEIR RESPECTIVE AFFILIATES
SPECIFICALLY DISCLAIM LIABILITY FOR ANY AND ALL DIRECT, INDIRECT,
SPECIAL, GENERAL, INCIDENTAL, CONSEQUENTIAL, PUNITIVE OR
EXEMPLARY DAMAGES INCLUDING, BUT NOT LIMITED TO, LOSS OF PROFITS
OR REVENUE OR ANTICIPATED PROFITS OR REVENUE ARISING OUT OF THE
USE OR INABILITY TO USE ANY SIERRA WIRELESS PRODUCT, EVEN IF
Rev 1.0 1/27/14 3
Reference Guide
SIERRA WIRELESS AND/OR USROBOTICS AND/OR THEIR RESPECTIVE
AFFILIATES HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES
OR THEY ARE FORESEEABLE OR FOR CLAIMS BY ANY THIRD PARTY.
Notwithstanding the foregoing, in no event shall Sierra Wireless or USRobotics
and/or their respective affiliates aggregate liability arising under or in connection with
the Sierra Wireless/ USRobotic product, regardless of the number of events,
occurrences, or claims giving rise to liability, be in excess of the price paid by the
purchaser for the Sierra Wireless /USRobotics product.
Customer understands that neither Sierra Wireless nor USRobotics is providing
cellular or GPS (including A-GPS) services. These services are provided by a third
party and should be purchased directly by the Customer.
Rev 1.0 1/27/14 4
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SPECIFIC DISCLAIMERS OF LIABILITY: CUSTOMER RECOGNIZES AND
ACKNOWLEDGES SIERRA WIRELESS IS NOT RESPONSIBLE FOR AND SHALL
NOT BE HELD LIABLE FOR ANY DEFECT OR DEFICIENCY OF ANY KIND OF
CELLULAR OR GPS (INCLUDING A-GPS) SERVICES.
Patents
This product may contain technology developed by or for Sierra Wireless, Inc.
This product includes technology licensed from QUALCOMM®.
This product is manufactured or sold by Sierra Wireless, Inc. or its affiliates under
one or more patents licensed from InterDigital Group and MMP Portfolio Licensing.
Copyright
© 2014 USRobotics. All rights reserved.
Trademarks
USRobotics®, CourierTM and the USRobotics logo are registered trademarks of
USRobotics.
Sierra Wireless®, AirPrime®, AirLink®, AirVantage® and the Sierra Wireless logo are
registered trademarks of Sierra Wireless.
Windows® is a registered trademark of Microsoft Corporation.
QUALCOMM® is a registered trademark of QUALCOMM Incorporated. Used under
license.
Other trademarks are the property of their respective owners.
Contact Information
Web:
http://www.usr.com/support
Consult our website for up-to-date product descriptions, documentation, application
notes, firmware upgrades, and troubleshooting tips: http://www.usr.com/support/3500
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Document History
Version
Date
Updates
1.0 Initial release
Rev 1.0 1/27/14 6
Contents
CONTENTS ................................................................................................................ 6!
LIST OF FIGURES ..................................................................................................... 8!
LIST OF TABLES ....................................................................................................... 9!
1.! FUNCTIONAL SPECIFICATIONS ...................................................................... 11!
1.1.! Functional Architecture .............................................................................. 11!
1.2.! RF Functionalities ...................................................................................... 12!
1.3.! Operating System ...................................................................................... 12!
2.! TECHNICAL SPECIFICATIONS ........................................................................ 13!
2.1.! Power Supply ............................................................................................ 13!
2.2.! Mechanical Specifications ......................................................................... 14!
3.! INTERFACES ..................................................................................................... 15!
3.1.! Front Interface ........................................................................................... 15!
3.1.1.! Power Supply Connector .................................................................. 15!
3.1.2.! Serial Interface .................................................................................. 21!
3.1.3.! USB Interface .................................................................................... 29!
3.2.! Back Interface ............................................................................................ 30!
3.2.1.! SIM Interface ..................................................................................... 30!
3.2.2.! RF Interface ....................................................................................... 31!
4.! SIGNALS AND INDICATORS ............................................................................ 37!
4.1.! Alarm Mode ............................................................................................... 37!
4.2.! RESET Signal Connection ........................................................................ 37!
4.2.1.! Reset Sequence ................................................................................ 39!
4.3.! LED Status Indicator .................................................................................. 39!
4.4.! Real Time Clock (RTC) .............................................................................. 40!
4.5.! Interrupt ..................................................................................................... 40!
5.! EXPANSION ....................................................................................................... 41!
5.1.! Expansion Compartment ........................................................................... 41!
6.! POWER CONSUMPTION ................................................................................... 42!
6.1.! Various Operating Modes .......................................................................... 42!
6.2.! Working Mode Features ............................................................................ 43!
6.3.! Connected Mode Power Consumption ...................................................... 44!
6.4.! Non-Connected Mode Power Consumption .............................................. 46!
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7.! RECOMMENDATIONS WHEN USING THE USR3500 ON TRUCKS ............... 48!
7.1.! Recommended Power Supply Connection on Trucks ............................... 48!
7.2.! Technical Constraints on Trucks ............................................................... 49!
8.! RELIABILITY COMPLIANCE AND RECOMMENDED STANDARDS ............... 50!
8.1.! Reliability Compliance ............................................................................... 50!
8.2.! Applicable Standards Listing ..................................................................... 50!
8.3.! Environmental Specifications .................................................................... 51!
8.3.1.! Function Status Classification ........................................................... 52!
9.! CERTIFICATION COMPLIANCE AND RECOMMENDED STANDARDS ......... 53!
9.1.! Certification Compliance ............................................................................ 53!
9.2.! Applicable Standards Listing ..................................................................... 54!
10.!SAFETY RECOMMENDATIONS ........................................................................ 55!
10.1.! General Safety ......................................................................................... 55!
10.2.! RF Safety ................................................................................................. 57!
10.2.1.! General ........................................................................................... 57!
10.2.2.! Exposure to RF Energy ................................................................... 57!
10.2.3.! Efficient Modem Operation .............................................................. 57!
10.3.! Vehicle Safety .......................................................................................... 57!
10.4.! Care and Maintenance ............................................................................ 58!
10.5.! Your Responsibility .................................................................................. 58!
11.!REFERENCE DOCUMENTS .............................................................................. 59!
11.1.! Firmware Documentation ........................................................................ 59!
11.2.! Expansion Card Documentation .............................................................. 59!
12.!LIST OF ABBREVIATIONS ................................................................................ 60!
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List of Figures
Figure 1.! Functional Architecture ............................................................................ 11!
Figure 2.! RF Architecture ........................................................................................ 12!
Figure 3.! USR3500 Mechanical Drawing ................................................................ 14!
Figure 4.! Front Interface ......................................................................................... 15!
Figure 5.! Power Supply Connector ......................................................................... 16!
Figure 6.! Equivalent Circuit of VIL, Vref = 2.8V ....................................................... 17!
Figure 7.! Equivalent Circuit of VIH, Vref = 2.8V ....................................................... 18!
Figure 8.! Equivalent Circuit of VOL, Vref = 2.8V ...................................................... 18!
Figure 9.! Equivalent Circuit of VOH, Vref = 2.8V ..................................................... 18!
Figure 10.! Equivalent Circuit of VIL, Vref > 2.8V ....................................................... 19!
Figure 11.! Equivalent circuit of VIH, Vref > 2.8V ....................................................... 19!
Figure 12.! Equivalent circuit of VOL, Vref > 2.8V ...................................................... 19!
Figure 13.! Equivalent circuit of VOH, Vref > 2.8V ...................................................... 19!
Figure 14.! 15-Pin Serial Connector .......................................................................... 21!
Figure 15.! RS232 Serial Link Signals ....................................................................... 23!
Figure 16.! V24 Serial Link Implementation for a 5-wire UART ................................. 24!
Figure 17.! V24 Serial Link Implementation for a 4-wire UART ................................. 24!
Figure 18.! V24 Serial Link Implementation for a 2-wire UART ................................. 25!
Figure 19.! Equivalent Circuit of CSPK ...................................................................... 28!
Figure 20.! Mini-B USB Connector............................................................................. 29!
Figure 21.! USR3500 Back Interface ......................................................................... 30!
Figure 22.! Main RF Connector.................................................................................. 31!
Figure 23.! Secondary RF Connector for USR3500 .................................................. 32!
Figure 24.! GPS RF Connector for USR3500 ............................................................ 32!
Figure 25.! Reset Sequence Diagram ....................................................................... 39!
Figure 26.! USR3500 expansion compartment .......................................................... 41!
Figure 27.! Recommended Power Supply Connection on Trucks ............................. 48!
Figure 28.! Example of an Electrical Connection That May Damage the modem ..... 49!
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List of Tables
Table 1.! Power Supply Electrical Characteristics ................................................... 13!
Table 2.! Power Supply Connector Pin Description ................................................. 16!
Table 3.! GPIO Pin Description ................................................................................ 17!
Table 4.! GPIO Pin Operating Conditions when Vref is at 2.8V ............................... 17!
Table 5.! GPIO Pin Operating Conditions when Vref > 2.8V ................................... 18!
Table 6.! ON/OFF Pin Operation ............................................................................. 21!
Table 7.! ON/OFF Pin Description ........................................................................... 21!
Table 8.! Serial Connector Pin Description .............................................................. 22!
Table 9.! Microphone Pin Description for USR3500 ................................................ 26!
Table 10.! Equivalent Circuits of CMIC ..................................................................... 26!
Table 11.! Electrical Characteristics of CMIC for USR3500 ..................................... 26!
Table 12.! Recommended Microphone Characteristics ............................................ 27!
Table 13.! Speaker Outputs Pin Description for USR3500 ....................................... 27!
Table 14.! Electrical Characteristics of CSPK for USR3500 ..................................... 28!
Table 15.! Recommended Speaker Characteristics ................................................. 28!
Table 16.! Mini-B USB Pin Description ..................................................................... 29!
Table 17.! USB Electrical Characteristics for USR3500 ........................................... 29!
Table 18.! SIM Socket Pin Description ..................................................................... 31!
Table 19.! Available RF Interfaces ........................................................................... 31!
Table 20.! Main Receiver Parameters for USR3500 ................................................ 32!
Table 21.! Main Transmitter Parameters for USR3500 ............................................ 32!
Table 22.! Antenna Specifications for USR3500 ...................................................... 33!
Table 23.! GPS Antenna Specifications for USR3500 .............................................. 34!
Table 24.! Alarm Mode (Low Power Mode) .............................................................. 37!
Table 25.! USR3500 Reset Status ........................................................................... 38!
Table 26.! Reset Electrical Characteristics for USR3500 ......................................... 38!
Table 27.! Reset Operating Conditions .................................................................... 38!
Table 28.! USR3500 LED Status .............................................................................. 39!
Table 29.! Real Time Clock Specifications ............................................................... 40!
Table 30.! Available Interrupt Pins on the USR3500 ................................................ 40!
Table 31.! Initial Power Consumption (Typical) ........................................................ 42!
Table 32.! USR3500 Operating Modes .................................................................... 42!
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Functional Specifications
Table 33.! USR3500 Operating Modes Feature Availability ..................................... 43!
Table 34.! Power Consumption of USR3500 in Connected Mode with Serial Port
OFF, Flash LED OFF and USB ON (typical values) .................................................. 44!
Table 35.! Power Consumption of USR3500 in Non-Connected Mode with UART
ON, FLASH LED OFF and USB OFF (typical values) ............................................... 47!
Table 36.! Standards Conformity for the modem ...................................................... 50!
Table 37.! Applicable Standards and Requirements for the modem ........................ 50!
Table 38.! Operating Class Temperature Range ...................................................... 51!
Table 39.! ISO Failure Mode Severity Classification ................................................ 52!
Table 40.! Standards Conformity for USR3500 ........................................................ 53!
Table 41.! Applicable Standards and Requirements for USR3500 .......................... 54!
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1. Functional Specifications
This section discusses the functional specifications of the USR3500.
1.1. Functional Architecture
The global architecture of the USR3500 is shown in the figure below.
Figure 1. Functional Architecture
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Functional Specifications
1.2. RF Functionalities
Figure 2. RF Architecture
1.3. Operating System
The modem is Open AT Application Framework compliant. With the Courier M2M
Open AT application loaded, the modem becomes a solution for many specific
market needs. The operating system of the modem is responsible for the following
functions:
• AT Command processing
• Real Time Clock (RTC) with calendar
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2. Technical Specifications
2.1. Power Supply
The modem is supplied by an external DC voltage, DC-IN, with a voltage range of
+4.75V to +32V.
The main regulation is made with an internal DC/DC converter in order to supply all
the internal functions with a DC voltage. The correct operation of the modem in
Communication mode is not guaranteed if the input voltage falls below 4.75V.
Refer to the following table for the modem’s operating voltage range and maximum
current.
Table 1. Power Supply Electrical Characteristics
Operating Voltage Range
• 4.75V to 32V DC, nominal at 13.2V
Maximum Current (Typical)
• 850mA, average at 4.75V; 3.7A Peak at 4.75V
The modem is permanently powered once the power supply is connected. In the
case of Alarm mode (Low Power mode), the user can set the modem “Turn-on” time.
Refer to section 4.1 Alarm Mode for more information.
Caution: The minimum input voltage specified here is the modem input. Be mindful of the input voltage
decrease caused by the power cable. When using the optional 6-wire cable accessory, this input
drop is at around 800mV at 4.75V and 220mV at 32V (EDGE 4TX).
The modem is designed for use with the original power cable, and the fuse that came with the
original cable is a 2A/250V Slow Break fuse 5.2mm*20mm.
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Technical Specifications
2.2. Mechanical Specifications
Figure 3. USR3500 Mechanical Drawing
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3. Interfaces
This section describes the different interfaces that connect with the USR3500. The
modem comes with the following interfaces:
• 10-pin Micro-Fit Connector
• USB Interface (mini-B connector)
• 15-pin Sub-D Serial Interface
• Main RF Interface
• Secondary RF Interface
• GPS RF Interface
• SIM Interface
• LED Status Indicator
3.1. Front Interface
Figure 4. Front Interface
3.1.1. Power Supply Connector
The power supply connector is a 10-pin Micro-Fit connector that is used for:
• External DC Power Supply connection with voltage from +4.75V to +32V, at
3.7A
• GPIO connections and GPIO voltage reference
• ON/OFF pin to power OFF the modem
• Interrupt pin
Mini-B USB
15-pin Sub-D Serial Interface
10-pin Micro-Fit
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Interfaces
Figure 5. Power Supply Connector
Refer to the following table for the pin description of the power supply connector.
Table 2. Power Supply Connector Pin Description
Pin #
Signal
Description
1
GPIO25/INT1
General purpose input/output or Interrupt
2
GPIO35
General purpose input/output
3
Vref
Voltage reference for the GPIOs
4
Reserved
Reserved
5
Reserved
Reserved
6
GND
Ground
7
DC-IN
Input Supply for the modem (4.75V to 32V)
8
ON/OFF
Control pin to power OFF the modem
9
Reserved
Reserved
10
Reserved
Reserved
The input voltage range (DC-IN) is from 4.75V to 32V, with a typical operating
voltage of 13.2V.
Caution: Pins 1, 2, 3, 4, 5, 8, 9 and 10 are low voltage interfaces. It is strictly prohibited to connect these pins
to any power supply as there is a risk of damaging the modem.
3.1.1.1. General Purpose Input/Output
The modem has two external GPIO ports:
• GPIO35
and
• GPIO25;
as well as a voltage reference line, Vref.
Vref sets the reference voltage of the input or output of the two GPIOs. Leaving it
unconnected sets the GPIO level at 2.3V – 2.6V by default. It is strongly
recommended to connect to the required GPIOs’ output voltage (2.8V ~ 15V).
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Interfaces
Refer to the following table for the pin description of the GPIOs.
Table 3. GPIO Pin Description
Pin #
Signal
I/O
I/O Voltage
Description
1
GPIO25/INT 1
I/O
Vref
General purpose input/output or Interrupt
2
GPIO35
I/O
Vref
General purpose input/output
3
Vref I 2.8V ~ 15V
Voltage reference for the GPIOs
Note: It is recommended to use a 6-wire cable accessory for easy access to these three lines. Please
refer to the Getting Started Guide at http://www.usr.com/support/3500 for more information about
the 6-wire cable accessory.
When the voltage reference, Vref, is not connected, if one of the GPIO output is in High state while
the other is in Low state, the GPIO in high level voltage will be at 2.3V.To avoid this voltage drop, it
is recommended to use Vref to the desired output voltage.
With Vref connected to 2.8V, both GPIO35 and GPIO25 may be interfaced with a
component that complies with the following levels.
Table 4. GPIO Pin Operating Conditions when Vref is at 2.8V
Parameter
Mininum
Typical
Maximum
Condition
VIL
0.84V
Please refer to Figure 6.
VIH
1.96V
Please refer to Figure 7.
VOL
0.4*
Please refer to Figure 8.
VOH
2.8*
modem Zout = 100K Pull-up to Vref, please
refer to Figure 9.
* Value without external load.
Figure 6. Equivalent Circuit of VIL, Vref = 2.8V
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Interfaces
Figure 7. Equivalent Circuit of VIH, Vref = 2.8V
Figure 8. Equivalent Circuit of VOL, Vref = 2.8V
Figure 9. Equivalent Circuit of VOH, Vref = 2.8V
With Vref > 2.8V, both GPIO35 and GPIO25 may be interfaced with a component
that complies with the following levels.
Table 5. GPIO Pin Operating Conditions when Vref > 2.8V
Parameter
Min
Typ
Max
Condition
VIL
0.84V
Please refer to Figure 10.
VIH
1.96V
Please refer to Figure 11.
VOL
*
058.0
110
+
Vref
Please refer to Figure 12.
VOH
Vref*
modem Zout = 100K Pull-up to Vref, please
refer to Figure 13.
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Interfaces
* Value without external load.
Figure 10. Equivalent Circuit of VIL, Vref > 2.8V
Figure 11. Equivalent circuit of VIH, Vref > 2.8V
Figure 12. Equivalent circuit of VOL, Vref > 2.8V
Figure 13. Equivalent circuit of VOH, Vref > 2.8V
The GPIO pin is mainly used to:
• Act as a switch for a transistor when the GPIO is configured as output.
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