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
Rev 1.0 1/27/14 5
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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!
Rev 1.0 1/27/14 11
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
Rev 1.0 1/27/14 13
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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Interfaces
• Act as a status reading when the GPIO is configured as input.
The GPIOs may be controlled with the following AT commands:
• AT+WIOW for write access to the GPIO value, when the GPIO is used as
an output
• AT+WIOR for read access to the GPIO value, when the GPIO is used
as an input
[1] By default, and when the modem has been reset, both GPIOs are
configured as inputs. The AT command AT+WIOM must be used to change
this configuration. Refer to documents [3] AT Commands Interface Guide
[2] Customer Release Notes for Firmware 7.52 A1
for more information regarding this AT command.
3.1.1.1.1. Setting the GPIO as an Output
Refer to the following example for how to configure the GPIO as an output.
• Enter the following commands:
! AT+WIOM=1,“GPIO21”,1,0 " this command activates
GPIO21 as an output and sets it at a low level.
! AT+WIOW=“GPIO21”,1 " this command sets the output
level of GPIO21 to HIGH.
3.1.1.1.2. Setting the GPIO as an Input
Refer to the following example for how to configure the GPIO as an input.
• Enter the following commands:
! AT+WIOM=1,“GPIO21”,0 " this command activates GPIO21 as
an input.
! AT+WIOR=“GPIO21” " this command reads the
GPIO21 level and returns the value “1” which represents a HIGH level.
• Pull the GPIO21 pin to GND, and read again. The return value should now be
“0” which represents a LOW level.
Refer to the AT Commands Interface Guide at http://www.usr.com/support/3500 for
more information regarding AT commands.
Note: The AT+WIOW and AT+WIOR commands will automatically set the GPIO to the desired mode. For
example, AT+WIOW=42,1 will set GPIO42 to output mode and in High state.
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Interfaces
3.1.1.2. ON/OFF Pin
The modem has an external ON/OFF pin which is used to turn the device ON or OFF.
The following table describes the operation of this pin.
Table 6. ON/OFF Pin Operation
Condition
State
Power Supply
Operation
1
Open
When 4.75V to 32V supply is
applied.
The modem is turned ON.
2
Pulled to GND
When 4.75V to 32V supply is
applied.
The modem remains OFF.
3
Left open when turning
ON the modem, then
pulled to GND
4.75V to 32V supply is initially
applied.
The modem remains ON and will
remain ON until AT+CPOF is sent to
turn the device OFF.
To enable the low power mode, the user may simply pull the ON/OFF pin to GND
and send AT+CPOF to the modem using a communication software such as a
HyperTerminal.
Table 7. ON/OFF Pin Description
Pin #
Signal
I/O
I/O Voltage
Description
8
ON/OFF
I
4V
Pin to turn the modem ON/OFF.
Refer to the power consumption tables in section 6 Power Consumption for the
power consumption values when the modem is in Alarm mode (Low Power mode).
3.1.2. Serial Interface
A SUB-D 15-pin connector is available as a serial interface to directly communicate
with the modem. This serial interface is used for:
• RS232 serial link connection
• Audio lines connection (microphone and speaker)
• RESET signal connection
Figure 14. 15-Pin Serial Connector
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Interfaces
Refer to the following table for the pin description of the 15-pin serial connector.
Table 8. Serial Connector Pin Description
Pin #
Signal
I/O
I/O Type
Reset State
Description
1
CT109/DCD
O
+/- 5.5V
Undefined
Data Carrier Detect
2
CT103/TXD
I
+/- 5.5V
Z
Transmit Serial Data
3
Reserved
Do not connect
4
CMIC2P
I
Analog
Microphone positive input
5
CMIC2N
I
Analog
Microphone negative input
6
CT104/RXD
O
+/- 5.5V
1
Receive Serial Data
7
CT107/DSR
O
+/- 5.5V
Z
Data Set Ready
8
CT108-2/DTR
I
+/- 5.5V
Z
Data Terminal Ready
9
GND
GND
Ground
10
CSPK2P
O
Analog
Speaker positive input
11
CT106/CTS
O
+/- 5.5V
Z
Clear To Send
12
CT105/RTS
I
+/- 5.5V
Z
Request To Send
13
CT125/RI
O
+/- 5.5V
Undefined
Ring Indicator
14
RESET
I/O
1V8 Modem Reset
15
CSPK2N
O
Analog
Speaker negative input
3.1.2.1. RS232 Serial Link Connection
Also known as the main serial link, the RS232 interface performs the voltage level
adaptation (V24/CMOS ⇔ V24/V28) between the internal modem (DCE) and
external applications (DTE).
The signals available on the RS232 serial link are as follows:
• TX data (CT103/TXD)
• RX data (CT104/RXD)
• Request To Send (CT105/RTS)
• Clear To Send (CT106/CTS)
• Data Terminal Ready (CT108-2/DTR)
• Data Set Ready (CT107/DSR)
• Data Carrier Detect (CT109/DCD)
• Ring Indicator (CT125/RI)
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Interfaces
Figure 15. RS232 Serial Link Signals
The RS232 interface has been designed to allow flexibility in the use of the serial
interface signals. However, the use of TXD, RXD, CTS and RTS signals are
mandatory; while the use of DTR, DSR, DCD and RI signals are optional.
Tip: The modem is designed to operate using all serial interface signals and it is recommended to use
CT105/RTS and CT106/CTS for hardware flow control in order to avoid data corruption during
transmission.
The USR3500 also implements the Serial Port Auto Shut Down feature with the DTR signal. It is
recommended to use the CT108-2/DTR signal to benefit from the current consumption
improvement performed by this feature.
3.1.2.2. RS232 Implementation
The following subsections describe how the RS232 serial link can be implemented to
suit different designs.
3.1.2.2.1. 5-wire Serial Interface RS232 Implementation
The signals used in this interface are as follows:
• CT103/TXD
• CT104/RXD
• CT105/RTS
• CT106/CTS
• CT108-2/DTR
Note: The CT108-2/DTR signal must be managed following the V24 protocol signaling if the Sleep Idle
Mode and Serial Port Auto Shut Down feature are to be used.
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Interfaces
Figure 16. V24 Serial Link Implementation for a 5-wire UART
3.1.2.2.2. 4-wire Serial Interface RS232 Implementation
The signals used in this interface are as follows:
• CT103/TXD
• CT104/RXD
• CT105/RTS
• CT106/CTS
Figure 17. V24 Serial Link Implementation for a 4-wire UART
3.1.2.2.3. 2-wire Serial Interface RS232 Implementation
The signals used in this interface are as follows:
• CT103/TXD
• CT104/RXD
Note: Although this case is possible, it is not recommended.
The flow control mechanism must be managed from the customer end.
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Interfaces
Figure 18. V24 Serial Link Implementation for a 2-wire UART
The CT105/RTS and the CT106/CTS signals are not used in this configuration.
Configure the AT command AT+IFC=0,0 to disable the flow control function. Refer to
the AT Commands Interface Guide at http://www.usr.com/support/3500 for more
information regarding AT Commands.
For more information on how to use the RS232 serial link to communicate with the
modem, refer to section 3.1.2.1 RS232 Serial Link Connection.
3.1.2.3. Autobauding Mode
The autobauding mode allows the modem to detect the baud rate used by the DTE
connected to the RS232 serial link. The autobauding mode is controlled by AT
commands. Refer to the AT Commands Interface Guide at
http://www.usr.com/support/3500 for more information.
3.1.2.4. Serial Port Auto Shut Down Feature
The RS232 serial link can be shut down when there is no activity between the DTE
and the modem. This can help improve the power consumption performance.
The Serial Port Auto Shut Down feature is controlled by the AT command AT+WASR.
Enter:
• AT+WASR=1 to enter the serial port auto shut down mode
• AT+WASR=0 to exit the serial port auto shut down mode
Refer to the AT Commands Interface Guide at http://www.usr.com/support/3500 for
more information on AT commands.
Caution: GPIO24 is reserved for serial port auto shut down feature. It is prohibited for customer use.
Improper access to GPIO24 by customers may lead to unexpected behavior on serial port
performance.
It is prohibited to use the serial port auto shut down feature when the CT108-2/DTR is not used in
the application. Otherwise, there will be data lost from the DTE side to the modem.
Rev 1.0 1/27/14 26
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Interfaces
3.1.2.5. Audio Lines Connection
The modem supports one microphone input and one speaker output.
3.1.2.5.1. Microphone
The microphone inputs are connected in differential mode to reject common mode
noise and TDMA noise. The microphone inputs have already included biasing for an
electret microphone (0.5mA and 2V) and are ESD protected. An electret microphone
may be directly connected to these inputs allowing an easy connection to a headset.
The microphone gain can be adjusted by AT+VGT and the transmit digital gain can
be adjusted by AT+WDGT. Refer to documents the AT Commands Interface Guide
at http://www.usr.com/support/3500 for more information about these AT commands.
The following table shows the pin assignments of the microphone input.
Table 9. Microphone Pin Description for USR3500
(Sub D
15-pin)
Pin #
Signal
I/O
I/O Type
Description
4
CMIC1P
I
Analog
Microphone positive input
5
CMIC1N
I
Analog
Microphone negative input
Table 10. Equivalent Circuits of CMIC
DC Equivalent Circuit
AC Equivalent Circuit
Table 11. Electrical Characteristics of CMIC for USR3500
Parameters
Min
Typ
Max
Unit
DC Characteristics
N/A V
AC Characteristics 200 Hz<F<4
kHz
Z
70
120
160
kΩ
Working voltage
(CMICxP-CMICxN)
AT+VGT*=3500dB
13.8
mVrms
AT+VGT*=2000dB
77.5 AT+VGT*=700dB
346
Maximum rating voltage
(CMICxP or CMICxN)
Positive
+7.35**
V
Negative
-0.9
Rev 1.0 1/27/14 27
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Interfaces
* The input voltage depends of the input micro gain set by AT command. Refer to the AT Commands Interface
Guide at http://www.usr.com/support/3500.
** Because CMICxP is internally biased, it is necessary to use a coupling capacitor to connect an audio signal
provided by an active generator. Only a passive microphone can be directly connected to the CMICxP and CMICxN inputs.
Refer to the following table for the list of recommended microphone characteristics.
Table 12. Recommended Microphone Characteristics
Feature
Values
Type
Electret 2V/0.5 mA
Impedance
Z = 2kΩ
Sensitivity
-40dB to -50dB
SNR
> 50dB
Frequency response
Compatible with GSM specifications
3.1.2.5.2. Speaker
The speaker outputs are connected in differential mode to reject common mode
noise and TDMA noise.
Speaker outputs are connected to internal push-pull amplifiers and may be loaded
down with components between 32 – 150Ω and up to 1nF. These outputs may be
directly connected to a speaker.
The output power may be adjusted by 2dB steps. The gain of the speaker outputs is
internally adjusted and may be tuned using the AT+VGR command. Furthermore,
the digital gain can be adjusted using AT+WDGR. Refer to the AT Commands
Interface Guide at http://www.usr.com/support/3500 for more information about these
AT commands.
The following table shows the pin assignments of the speaker output.
Table 13. Speaker Outputs Pin Description for USR3500
(Sub D
15-pin)
Pin #
Signal
I/O
I/O Type
Description
10
CSPK1P
O
Analog
Speaker positive output
15
CSPK1N
O
Analog
Speaker negative output
Rev 1.0 1/27/14 28
Reference Guide
Interfaces
Figure 19. Equivalent Circuit of CSPK
Table 14. Electrical Characteristics of CSPK for USR3500
Parameters
Min
Typ
Max
Unit
Biasing voltage
CSPKxP and CSPKxN
-1.5 1.5
mV
Output swing
voltage
RL=16Ω: AT+VGR=-1600*; single-ended
-
1.7 Vpp
RL=32Ω: AT+VGR=-1600*; single-ended
-
1.9
2.75
Vpp
RL
Load resistance
14.5
32 - Ω
IOUT
Output current; peak value; RL=16Ω
-
40
85
mA
Output current; peak value; RL=32Ω
-
22 - mA
POUT
RL=16Ω; AT+VGR=-1600*
-
25 - mW
RL=32Ω; AT+VGR=-1600*
-
16
27
mW
RPD
Output pull-down resistance at power-down
28
40
52
kΩ
* The output voltage depends of the output speaker gain set by AT command. Refer to the AT Commands
Interface Guide at http://www.usr.com/support/3500. This value is given in dB, but it’s possible to toggle this to index value.
Refer to the following table for the list of recommended speaker characteristics.
Table 15. Recommended Speaker Characteristics
Feature
Values
Type
10mW, electro-magnetic
Impedance
Z = 30 to 50Ω
Sensitivity
110dB SPL min. (0dB = 20µPa)
Frequency response
Compatible with GSM specifications
Rev 1.0 1/27/14 29
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Interfaces
3.1.3. USB Interface
Aside from the serial interface, the Mini-B USB interface (USB slave) may also be
used to directly communicate with the modem.
Figure 20. Mini-B USB Connector
Refer to the following table for the pin description of the mini-B USB connector.
Table 16. Mini-B USB Pin Description
Pin #
Signal
Description
1
VBUS
+5V Power supply
2
D-
Differential data interface negative
3
D+
Differential data interface positive
4
ID
Not connected
5
GND
Ground
The USR3500 USB slave interface complies with USB 2.0 protocol signaling and
with USB 2.0 electrical interface.
The USB interface features:
• 480Mbit/s high-speed transfer rate
• 3.3V type compatible
• USB Soft-connect feature
• USB Download feature
• CDC 1.1 – ACM compliant
Table 17. USB Electrical Characteristics for USR3500
Parameter
I/O
Min
Typ
Max
Unit
VBUS
Input
4.75 5
V
D-, D+ (Low / Full speed)
Input High
2.00
3.30
3.60 V Input Low
0 0.80 V Output High
2.80
3.30
3.60 V Output Low
0.30
V
D-, D+ (High speed)
Input High
0.30 0.44
V
Rev 1.0 1/27/14 30
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Interfaces
Parameter
I/O
Min
Typ
Max
Unit
Input Low
0 0.01 V Output High
0.36
0.38
0.44
V
Output Low
0 0.01
V
The USB feature can be activated by using the AT+WMFM=0,1,3 AT command.
Refer to the AT Commands Interface Guide at http://www.usr.com/support/3500 for
more information regarding this AT command.
3.2. Back Interface
Figure 21. USR3500 Back Interface
3.2.1. SIM Interface
A SIM card can be directly connected to the USR3500 through the embedded SIM
socket. This interface controls 3V / 1V8 SIM cards and it is fully compliant with GSM
11.11 recommendations concerning SIM functions.
The SIM interface of the USR3500 is ESD protected. Transient overvoltage
protections in ESD are internally added on the signals connected to the SIM interface
in order to prevent any damage from electrostatic discharge.
The SIM interface uses 5 SIM signals, namely:
• SIM-VCC: SIM Power supply
• ~SIM-RST: Reset
• SIM-CLK: Clock
• SIM-IO: I/O Port
• SIMPRES: SIM card detection
Secondary RF Interface
SIM Interface
Main RF Interface
LED Status Indicator
Expansion Compartment
GPS RF Interface
Rev 1.0 1/27/14 31
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Interfaces
3.2.1.1. SIM Socket Pin Description
Refer to the following table for the pin description of the SIM socket.
Table 18. SIM Socket Pin Description
Pin #
Signal
I/O
I/O Type
Reset State
Description
1
SIMVCC
O
2V9 / 1V8
SIM Power Supply
2
SIMRST
O
2V9 / 1V8
O
SIM RESET
3
SIMCLK
O
2V9 / 1V8
O
SIM Clock
7
SIMDATA
I/O
2V9 / 1V8
Pull up*
SIM DATA
8
SIMPRES
I
1V8
Pull low**
SIM Card Detect
* SIM-IO pull up is about 10KΩ.
** SIMPRES pull low is about 100KΩ.
3.2.2. RF Interface
The USR3500 has three RF interfaces. Refer to the following table for the list of
available RF interfaces.
Table 19. Available RF Interfaces
Main RF Interface
Secondary RF
Interface
GPS RF Interface
# # #
The main antenna connector allows the transmission of radio frequency (RF) signals
from the device to an external customer supplied antenna. This interface is an SMA
type connector and its nominal impedance is 50Ω.
Figure 22. Main RF Connector
The secondary RF interface is used in USR3500 for 3G diversity antenna connection.
It is an SMA type connector and its nominal impedance is 50Ω.
Rev 1.0 1/27/14 32
Reference Guide
Interfaces
Figure 23. Secondary RF Connector for USR3500
The GPS RF interface is used for GPS antenna connection. It is an MMCX type
connector and its nominal impedance is 50Ω. It also provides bias for active antenna.
For more details, refer to section 3.2.2.3.6 Active GPS Antenna Bias.
Figure 24. GPS RF Connector for USR3500
3.2.2.1. RF Performances
RF performances are compliant with ETSI recommendation GSM 05.05. Refer to the
tables below for the main parameters used for both the Receiver and the Transmitter.
Table 20. Main Receiver Parameters for USR3500
Parameters
Typical Values
GSM850 Reference Sensitivity
-108dBm
E-GSM900 Reference Sensitivity
-109dBm
DCS1800 Reference Sensitivity
-107dBm
PCS1900 Reference Sensitivity
-107dBm
3G Band I 2100 Reference Sensitivity
-108dBm
3G Band II 1900 Reference Sensitivity
-107dBm
3G Band V 850 Reference Sensitivity
-110dBm
3G Band VI 800 Reference Sensitivity
-110dBm
3G Band VIII 900 Reference Sensitivity
-108dBm
Selectivity @ 200 kHz
> +9dBc
Selectivity @ 400 kHz
> +41dBc
Linear dynamic range
63dB
Co-channel rejection
>= 9dBc
Table 21. Main Transmitter Parameters for USR3500
Parameters
Typical Values
Output power at PCL5 (EGSM & GSM850)
32dBm
Output power at PCL0 (GSM1800 & PCS1900)
29dBm
Rev 1.0 1/27/14 33
Reference Guide
Interfaces
Parameters
Typical Values
Output power at PCL19 (EGSM & GSM850)
5dBm
Output power at PCL15 (GSM1800 & PCS1900)
0dBm
Output power Class 3 (3G all band)
23dBm
3.2.2.2. Antenna Specifications
The main/secondary antenna must meet the requirements specified in the table
below.
The optimum operating frequency depends on the application. A dual-band or quadband antenna should operate in these frequency bands and have the following
characteristics.
Antennas used with the USR3500 must have a maximum antenna gain of 1 dBi for
Bands 900 and 1800, and 2.5 dBi for Band 2100.
Table 22. Antenna Specifications for USR3500
Characteristics
GSM850
and
WCDMA
Band V
WCDMA
Band VI
EGSM 900
and
WCDMA
Band VIII
DCS 1800
PCS 1900
and
WCDMA
Band II
WCDMA
Band I
TX Frequency
824 to 849
MHz
830 to 840
MHz
880 to 915
MHz
1710 to
1785 MHz
1850 to
1910 MHz
1920 to
1980 MHz
RX Frequency
869 to 894
MHz
875 to 885
MHz
925 to 960
MHz
1805 to
1880 MHz
1930 to
1990 MHz
2110 to
2170 MHz
Impedance
50Ω
VSWR
Rx max
1.5:1
Tx max
1.5:1
Typical radiated
gain
0dBi in one direction at least
Rev 1.0 1/27/14 34
Reference Guide
Interfaces
The USR3500 GPS antenna must meet the requirements specified in the table
below.
Table 23. GPS Antenna Specifications for USR3500
Characteristic
GPS L1
RX Frequency
1575.42 MHz
RF Impedance
50Ω
VSWR
Rx max
1.5:1
LNA Bias Voltage
5V
LNA Current
Consumption
40mA MAX
Polarization
Linear, vertical
Typical radiated
gain
0dBi in one direction at least
3.2.2.3. GPS Specifications for USR3500
Note: These specifications are preliminary targets that are subject to change without notice. Actual GPS
functionality depends on the firmware version and module configuration.
The USR3500 provides the GPS features listed in the following sub-sections. This
GPS feature can be used through AT commands provided by the Extended Open AT
application (which is pre-loaded at the factory) or from a custom Open AT application
using Location Library.
3.2.2.3.1. Standalone GPS
• Leading standalone/autonomous GPS performance
• -145 dBm cold start sensitivity
• -153 dBm hot start sensitivity
• -155 dBm tracking sensitivity
• < 45 second average cold start TTFF (Time To First Fix) in open air
• < 3 second average super hot TTFF in open sky
• < 10 m accuracy in open sky
Note: For optimum performance, the modem should be registered on the GSM/UMTS network, but does
not need to be on an active data or voice call.
3.2.2.3.2. gpsOneXTRATM
• Enables enhanced standalone GPS operation by downloading < 40 kB file
from a server on the Internet
• Performance closer to UE-based operation than traditional standalone GPS
operation
Rev 1.0 1/27/14 35
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Interfaces
• Best if downloaded once every 1–2 days, but valid for up to 7 days with some
accuracy degradation
Rev 1.0 1/27/14 36
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Interfaces
3.2.2.3.3. A-GPS Features
• Leading A-GPS performance
Exceeds 3GPP RAN 4 AGPS performance specification
• -153 dBm cold start sensitivity
• -155 dBm tracking sensitivity
• < 5 second average cold start TTFF in open sky (UE-based)
• < 3 second average super hot TTFF in open sky
• < 2 m accuracy in open sky 1 Hz tracking with CEP-50
• UMTS Control Plane (CP) – UE-assisted and UE-based
• GSM Control Plane (CP) – UE-assisted and UE-based
3.2.2.3.4. Enhanced Navigation 2.0 Feature
• Provides leading performance in car and walking navigation modes as well as
accuracy while stationary
• Airline/Game/Offline mode
• GPS capability is available while phone is offline
3.2.2.3.5. NMEA
Supported sentences: GGA, GSA, GSV, RMC, VTG
3.2.2.3.6. Active GPS Antenna Bias
The USR3500 provides bias for active antenna, which can be enabled or disabled
using GPIO44. Note that GPIO44 needs to be at high level for antenna bias to be
activated.
Rev 1.0 1/27/14 37
4. Signals and Indicators
4.1. Alarm Mode
The USR3500 can be turned on using the Alarm mode when power supply is applied.
The USR3500 will remain in Low Power mode until the alarm is triggered to start the
USR3500 up.
Note: Refer to section 3.1.1.2 ON/OFF Pin for more information on how to turn the USR3500 ON or OFF
using the ON/OFF pin.
Table 24. Alarm Mode (Low Power Mode)
Steps
State
Power Supply
Operation
1
AT+CALA=“YY/MM/DD,H
H:MM”
4.75V to 32V supply is
applied.
The alarm is set.
The USR3500 remains ON.
2
Pulled ON/OFF PIN to
GND
4.75V to 32V supply is
applied.
The USR3500 remains ON.
3
AT+CPOF
4.75V to 32V supply is
applied. (The ON/OFF signal
remains at GND.)
The USR3500 turns OFF and will
remain OFF until the Alarm mode is
activated to turn the device ON.
Note: The USR3500’ clock must be set before Alarm mode is activated. To set the clock, refer to the
AT+CCLK command in the AT Commands Interface Guide at http://www.usr.com/support/3500.
4.2. RESET Signal Connection
This signal is used to force a reset procedure by providing the USR3500 with a LOW
level that lasts at least 200µs (when the power supply is already stabilized). It is
activated by either an external Reset signal or by an internal signal (from the Reset
generator); and is automatically driven by an internal hardware during the power ON
sequence.
Note: The USR3500 remains in Reset mode for as long as the Reset signal is held LOW.
A software reset is always preferred to a hardware reset. Refer to document documents the AT
Commands Interface Guide at http://www.usr.com/support/3500 for more information regarding
software resets.
This signal may also be used to provide a reset to an external device when the pin is
configured as an output. If no external reset is necessary, this input may be left open.
When used (as an emergency reset), it has to be driven by either an open collector
or an open drain output.
Caution: This signal is for emergency resets only.
Rev 1.0 1/27/14 38
Reference Guide
Signals and Indicators
Table 25. USR3500 Reset Status
(Serial
Port) Pin #
Signal
I/O
I/O Type
Voltage
Description
14
Reset
I/O
Open drain
1V8
USR3500 Reset
Table 26. Reset Electrical Characteristics for USR3500
Parameter
Minimum
Typical
Maximum
Unit
Input Impedance (R)*
10 kΩ
Input Impedance (C)
20 nF
* Internal pull-up
Table 27. Reset Operating Conditions
Parameter
Minimum
Typical
Maximum
Unit
~Reset time (Rt)1
200
µs
~Reset time (Rt)2 (at power up only)
20
40
100
ms
Cancellation time (Ct)
34 ms
VH*
0.57 V VIL 0
0.57 V VIH
1.33
V
* VH = Hysterisis Voltage
1: This reset time is the minimum to be carried out on the ~Reset signal when the power supply is stabilized.
2: This reset time is internally carried out by the embedded module power supply supervisor only when the
embedded module power supplies are powered ON.
Rev 1.0 1/27/14 39
Reference Guide
Signals and Indicators
4.2.1. Reset Sequence
To activate the Reset sequence, the Reset signal has to be set to LOW for a
minimum of 200µs. As soon as the reset is done, the application can send the
command AT! and the AT interface will send an “OK” back to the application. If the
application manages hardware flow control, the AT command may be sent during the
initialization phase.
Figure 25. Reset Sequence Diagram
Another solution is to use the AT+WIND command to get an unsolicited status from
the USR3500. Refer to the AT Commands Interface Guide at
http://www.usr.com/support/3500 for more information regarding AT commands.
4.3. LED Status Indicator
The USR3500 has a red LED that indicates the current operational status of the
device.
Table 28. USR3500 LED Status
USR3500 State
LED Status
USR3500 Status
ON
Permanently lighted
The modem is switched ON, but not
registered in the network.
Flashing slowly
LED is ON for 200ms, OFF for 2s
The modem is switched ON and is
registered in a network (Idle mode).
Flashing rapidly
LED is ON for 200ms, OFF for
600ms
The modem is switched ON and is
registered in a network (Connected mode).
Very quick flash
LED is ON for 100ms, OFF for
200ms
The modem is switched on, and the
software downloaded is either corrupted or
non-compatible (“BAD SOFTWARE”).
OFF
OFF
The modem is either switched OFF, or the
Flash LED has been disabled by the user*.
Rev 1.0 1/27/14 40
Reference Guide
Signals and Indicators
* The Flash LED can be disabled by the user when in Sleep mode in order to save power consumption. Refer to
the AT Commands Interface Guide at http://www.usr.com/support/3500 for more information on how to disable the Flash
LED using an AT command.
4.4. Real Time Clock (RTC)
The USR3500 has implemented Real Time Clock for saving date and time when the
USR3500 is unplugged from the DC power supply through the DC power cable.
Table 29. Real Time Clock Specifications
Item
Minimum
Typical
Maximum
Charging Time start from fully discharged to fully charged
15 Hours
RTC Time Period*
Guaranteed
30 Hours
Not guaranteed
60 Hours
* This RTC time period is measured when the RTC battery is fully charged before the modem is unplugged from
the DC power source.
* This RTC time period is for temperature from -20°C to +60°C. Once the operating/storage temperature is
beyond this range, this time period is not guaranteed.
Caution: When the modem is shipped out, the charging voltage of the RTC battery is not guaranteed. Once
the modem is on power, the RTC battery will start charging and the RTC feature can then be
resumed.
4.5. Interrupt
An interrupt pin, INT1, is multiplexed with GPIO25 on pin 1 of the Microfit connector.
Additional interrupt pins are also available via the expansion card connector. Refer to
the following table for the list of available interrupt pins in the modem.
Table 30. Available Interrupt Pins on the USR3500
Interface Location
Pin Number
Signal Name
Multiplex
Notes
Microfit connector
1
INT1
GPIO25
Expansion connector
32
INT0
GPIO3
Rev 1.0 1/27/14 41
5. Expansion
5.1. Expansion Compartment
The expansion compartment allows users to easily expand the USR3500’s features
(Ethernet, for example) for their own applications.
Figure 26. USR3500 expansion compartment
Refer to the Ethernet Expansion Card User Guide at
http://www.usr.com/support/3500 for more information regarding this feature.
Rev 1.0 1/27/14 42
6. Power Consumption
The following sub-sections details out the power consumption values of the
USR3500 for various modes and RF bands. These consumption values were
obtained by performing measurements on USR3500 samples at a temperature of
25°C using a 3V SIM card.
Note: For power consumption, the software version used is R7.50 A1.
Refer to the Courier M2M Application guide at http://www.usr.com/support/3500 for
details on how to upgrade modem firmware.
The table below gives the average power consumption of the USR3500 for the first
10s when power supply (DC-IN, supplied by Agilent 66321D in this example) is
initially applied to it with no serial port, LED ON or SIM card at ambient temperature.
Table 31. Initial Power Consumption (Typical)
Configuration
USR3500 Average Power
Consumption with FW R7.50 A1
DC-IN @ 13.2V
18mA
6.1. Various Operating Modes
The power consumption levels of the USR3500 vary depending on the operating
mode used. Refer to the table below for the different kinds of operating modes
available. Refer to Appendix 3.1 of the AT Commands Interface Guide at
http://www.usr.com/support/3500 for the working mode description.
Table 32. USR3500 Operating Modes
Operating Mode
Description
GSM Connected Mode
The modem is connected to a live GSM network, during circuit switch voice or data
call.
Transfer Mode
The modem has GPRS data transfer connection with a live network, during packet
data transmission.
Active mode with GSM
stack in Idle
When the RF function is active and the modem is synchronized with the network, but
there is currently no communication.
Sleep mode with GSM
stack in Idle
When the RF function is disabled but is regularly activated to remain synchronized
with the network.
This mode only works when the DTE sends an AT command to shut the serial link
down (DTE turns DTR to inactive state).
Active Mode
When the RF function is disabled and there is no synchronization with the network
but the UART is available.
Sleep Mode
When the RF function is disabled, and there is no synchronization with the network
and the UART is not available.
Rev 1.0 1/27/14 43
Reference Guide
Power Consumption
Operating Mode
Description
Alarm Mode
Low power consumption mode, the only feature which is available in this mode is the
alarm wake up.
When the alarm clock is set for the modem with ALL of the following conditions:
• before the alarm time is up
• with the ON/OFF signal pulled to GND
• with AT+CPOF entered from a computer that is connected to the modem
Serial Port Auto Shut
Down Feature
The serial link can be shut down when there is no activity between the DTE and the
modem.
This auto shut down feature can be enabled by AT command. Refer to section
3.1.2.4 Serial Port Auto Shut Down Feature for more information on this feature.
FLASH LED
Activated/Deactivated
The modem Flash LED can be enabled or disabled by AT command. Refer to
section for more information on this feature.
6.2. Working Mode Features
The table below sums up the feature availability in each mode.
Table 33. USR3500 Operating Modes Feature Availability
Features
Alarm
Mode
ACTIVE
Mode
with GSM
Stack in
Idle
SLEEP
Mode
with GSM
Stack in
Idle
ACTIVE
Mode
SLEEP
Mode
Connected
Mode
Transfer
Mode
Alarm √ √ √ √ √ √
√
Wake-up Open AT
Application
Framework on timer
events
- √ √ √ √ √ √
GSM/GPRS paging
(alert from the
network for
incoming call,
incoming SMS or
incoming GPRS
data)
- √ √ - - √ √
SIM - √ - - - √
√
UARTs - √ - √ - √
√
USB - √ - √ - √
√
SPIs - √ - √ - √
√
I2C - √ - √ - √
√
GPIO - √ - √ - √
√
ADCs - √ - √ - √
√
Buzzer - √ - √ - √
√
Keypad - √ √ √ √ √
√
External IT
- √ √ √ √ √ √
Flash LED
- √ √ √ √ √ √
Rev 1.0 1/27/14 44
Reference Guide
Power Consumption
6.3. Connected Mode Power Consumption
Table 34. Power Consumption of USR3500 in Connected Mode with Serial Port OFF, Flash LED OFF and USB ON
(typical values)
Mode
Parameters
I
average
I
peak
Unit
DC-IN
=4.75V
DC-IN
=13.2V
DC-IN
=32V
DC-IN
=4.75V
DC-IN
=13.2V
GSM
850 MHz
PCL5 (TX power 33dBm)
420
107
46
3625
703
mA
PCL19 (TX power 5dBm)
97
34
15
682
249
mA
900 MHz
PCL5 (TX power 33dBm)
428
109
47
3782
710
mA
PCL19 (TX power 5dBm)
99
35
15
698
215
mA
1800 MHz
PCL0 (TX power 30dBm)
299
91
39
2374
536
mA
PCL15 (TX power 0dBm)
101
35
16
728
226
mA
1900 MHz
PCL0 (TX power 30dBm)
269
86
37
2169
497
mA
PCL15 (TX power 0dBm)
102
36
16
813
255
mA
GPRS
class 8
(1TX,
4RX)
850 MHz
PCL5 (gamma 3)
363
102
45
3478
702
mA
900 MHz
PCL5 (gamma 3)
384
107
42
3600
720
mA
1800 MHz
PCL0 (gamma 3)
291
84
38
2413
538
mA
1900 MHz
PCL0 (gamma 3)
253
83
36
2008
486
mA
GPRS
class 10
(2TX,
3RX)
850 MHz
PCL5 (gamma 3)
654
174
76
3503
880
mA
900 MHz
PCL5 (gamma 3)
698
185
78
3489
1001
mA
1800 MHz
PCL0 (gamma 3)
476
143
61
2348
910
mA
1900 MHz
PCL0 (gamma 3)
459
129
58
2201
833
mA
GPRS
class 12
(4TX, 1
RX)
850 MHz
PCL5 (gamma 3)
467
147
72
1414
749
mA
900 MHz
PCL5 (gamma 3)
519
180
75
1510
787
mA
1800 MHz
PCL0 (gamma 3)
553
184
78
1587
794
mA
1900 MHz
PCL0 (gamma 3)
570
183
76
1598
801
mA
EGPRS
class 8
(1TX,
4RX)
850 MHz
PCL8 (gamma 6)
197
67
58
1508
401
mA
900 MHz
PCL8 (gamma 6)
203
66
29
1464
406
mA
1800 MHz
PCL2 (gamma 5)
192
68
29
1404
497
mA
1900 MHz
PCL2 (gamma 5)
193
64
28
1357
387
mA
EGPRS
class 10
(2TX,
3RX)
850 MHz
PCL8 (gamma 6)
312
100
42
1453
740
mA
900 MHz
PCL8 (gamma 6)
301
95
43
1470
772
mA
1800 MHz
PCL2 (gamma 5)
313
108
49
1521
775
mA
1900 MHz
PCL2 (gamma 5)
293
97
43
1454
785
mA
EGPRS
class 12
(4TX,
1RX)
850 MHz
PCL8 (gamma 6)
437
150
66
1441
718
mA
900 MHz
PCL8 (gamma 6)
459
164
70
1460
804
mA
1800 MHz
PCL2 (gamma 5)
567
185
78
1557
811
mA
1900 MHz
PCL2 (gamma 5)
507
174
72
1494
765
mA
Rev 1.0 1/27/14 45
Reference Guide
Power Consumption
Mode
Parameters
I
average
I
peak
Unit
DC-IN
=4.75V
DC-IN
=13.2V
DC-IN
=32V
DC-IN
=4.75V
DC-IN
=13.2V
UMTS
(Voice)
Band I
+22 dBm
637
222
94
1090
767
mA
+10 dBm
227
81
34
1057
442
mA
Band II
+22 dBm
616
210
88
1074
830
mA
+10 dBm
232
80
35
1062
423
mA
Band V
+22 dBm
606
204
89
1042
898
mA
+10 dBm
204
70
31
842
417
mA
Band VI
+22 dBm
609
204
88
1036
858
mA
+10 dBm
200
71
30
978
404
mA
Band VIII
+22 dBm
582
200
87
1050
895
mA
+10 dBm
328
114
51
804
646
mA
UMTS
(Data
Transfer
2) 384
kbit/s
Band I
+22 dBm
694
225
97
585
781
mA
+10 dBm
243
85
42
987
457
mA
Band II
+22 dBm
798
226
107
1306
899
mA
+10 dBm
250
89
38
1121
481
mA
Band V
+22 dBm
628
208
90
1095
961
mA
+10 dBm
206
73
33
1117
430
mA
Band VI
+22 dBm
669
221
92
1133
827
mA
+10 dBm
216
76
32
1170
406
mA
Band VIII
+22 dBm
594
201
87
1045
1003
mA
+10 dBm
330
118
52
810
708
mA
HSDPA
Data
Transfer
2 Cat.10
14.4
Mbit/s
Band I
+22 dBm
736
243
103
1155
754
mA
+10 dBm
314
109
48
747
592
mA
Band II
+22 dBm
636
213
96
1032
724
mA
+10 dBm
322
107
46
703
585
mA
Band V
+22 dBm
664
225
96
1024
863
mA
+10 dBm
278
98
42
774
509
mA
Band VI
+22 dBm
705
227
95
885
928
mA
+10 dBm
269
92
42
668
415
mA
Band VIII
+22 dBm
668
219
91
988
656
mA
+10 dBm
386
133
61
820
749
mA
HSUPA
Data
Transfer
2 Cat.5
2 Mbit/s
Band I
+22 dBm
697
238
91
960
509
mA
+10 dBm
377
130
58
659
519
mA
Band II
+22 dBm
635
217
85
899
498
mA
+10 dBm
483
132
58
786
534
mA
Band V
+22 dBm
660
226
87
951
499
mA
+10 dBm
347
120
54
625
514
mA
Band VI
+22 dBm
657
224
88
922
549
mA
+10 dBm
335
117
52
618
506
mA
Band VIII
+22 dBm
638
220
85
946
557
mA
+10 dBm
401
140
54
715
558
mA
Rev 1.0 1/27/14 46
Reference Guide
Power Consumption
6.4. Non-Connected Mode Power Consumption
Note: The USB port must be deactivated to enter Sleep Mode.
Rev 1.0 1/27/14 47
Reference Guide
Power Consumption
Table 35. Power Consumption of USR3500 in Non-Connected Mode with UART ON, FLASH LED OFF and USB OFF
(typical values)
Mode
Serial Port
Status
I
average
Unit
DC-IN=4.75V
DC-IN=13.2V
DC-IN=32V
Active Idle Mode, HSPA
ON
45.82
16.56
7.6
mA
OFF
15.48
5.96
2.81
mA
Sleep Idle Mode, HSPA
ON
32.66
11.89
5.8
mA
OFF
3.09
1.39
0.78
mA
Active Idle Mode, 2G page 9
ON
46.01
16.47
7.5
mA
OFF
16.43
6.01
2.96
mA
Sleep Idle Mode, 2G page 9
ON
31.91
11.51
5.65
mA
OFF
2.7
1.12
0.81
mA
Active Idle Mode, 2G page 2
ON
47.11
16.82
7.75
mA
OFF
17.54
6.4
3.15
mA
Sleep Idle Mode, 2G page 2
ON
33.51
12.07
5.65
mA
OFF
4.3
1.64
1.14
mA
Alarm Mode
OFF
2.7
1.23
0.91
mA
Rev 1.0 1/27/14 48
7. Recommendations when Using the
USR3500 on Trucks
Caution: The power supply connection of the modem must never be directly connected to the truck battery.
7.1. Recommended Power Supply Connection on
Trucks
All trucks have a circuit breaker on the exterior of the cabin. The circuit breaker is
used for safety reasons: if a fire blazes in the trucks, (for example, on the wiring trunk)
the driver may cut the current source to avoid any damage (explosion). The circuit
breaker is connected to the truck ground, most often associated with the fuse box.
Most truck circuit breakers do not cut the Positive Supply line of the battery, but cut
the ground line of the latter.
Figure 27. Recommended Power Supply Connection on Trucks
The figure above shows the recommended power supply connection where the
ground connection of the modem is not directly connected to the battery but is
connected after the Circuit Breaker (on the truck ground or the fuse box).
Rev 1.0 1/27/14 49
Reference Guide
Recommendations when Using
the USR3500 on Trucks
7.2. Technical Constraints on Trucks
It is highly recommended to directly connect the power supply on the circuit breaker
rather than on the battery. The modem may be damaged when starting the truck if
the circuit breaker is switched OFF (in this case, the truck ground and the battery
ground will be connected through the modem as shown in the following figure).
Figure 28. Example of an Electrical Connection That May Damage the modem
The figure above gives an example of an electrical connection which may
dramatically damage the modem when its ground connection is directly connected to
the battery ground.
In this example, when the circuit breaker is switched OFF, the current flows through
the modem and powers the electrical circuit of the truck (for example, the
dashboard). Furthermore, when the Starter Engine command is used, it will destroy
the cables or the modem.
Since the internal tracks of the modem are not designed to support high currents (up
to 60A when starting the truck), they will be destroyed.
Rev 1.0 1/27/14 50
8. Reliability Compliance and
Recommended Standards
8.1. Reliability Compliance
The USR3500 is compliant with the following requirements.
Table 36. Standards Conformity for the modem
Abbreviation
Definition
IEC
International Electro technical Commission
ISO
International Organization for Standardization
8.2. Applicable Standards Listing
The table hereafter gives the basic list of standards applicable to the USR3500.
Note: References to any features can be found from these standards.
Table 37. Applicable Standards and Requirements for the modem
Document
Current
Version
Title
IEC6006826
7.0
Environmental testing - Part 2.6: Test FC: Sinusoidal Vibration.
IEC60068234
73
Basic environmental testing procedures part 2: Test FD: random vibration
wide band - general requirements.
Cancelled and replaced by IEC60068-2-64. For reference only.
IEC60068264
2.0
Environmental testing - part 2-64: Test FH: vibration, broadband random and
guidance.
IEC60068232
2.0
Basic environmental testing procedures - part 2: Test ED: (procedure 1)
Withdrawn & replaced by IEC60068-2-31. For reference only.
IEC60068231
2.0
Environmental testing part 2-31: Test EC: rough handling shocks, primarily
for equipment-type specimens.
IEC60068229
2.0
Basic environmental testing procedures - part 2: Test EB and guidance:
bump.
Withdrawn and replaced by IEC60068-2-27. For reference only.
IEC60068227
4.0
Environmental testing - part 2-27: Test EA and guidance: shock.
IEC60068214
6.0
Environmental testing - part 2-14: Test N: change of temperature.
IEC6006822
5.0
Environmental testing - part 2-2: Test B: dry heat.
IEC6006821
6.0
Environmental testing - part 2-1: Test A: cold.
IEC60068230
3.0
Environmental testing - part 2-30: Test DB: damp heat, cyclic (12 h + 12 h
cycle).
IEC6006823
69 w/A1
Basic environmental testing procedures part 2: Test CA: damp heat, steady
State.
Withdrawn and replaced by IEC60068-2-78. For reference only.
IEC60068278
1.0
Environmental testing part 2-78: Test CAB: damp heat, steady state.
Rev 1.0 1/27/14 51
Reference Guide
Reliability Compliance and
Recommended Standards
Document
Current
Version
Title
IEC60068238
2.0
Environmental testing - part 2-38: Test Z/AD: composite
temperature/humidity cyclic test.
IEC60068240
1.0 w/A1
Basic environmental testing procedures - part 2: Test Z/AM combined
cold/low air pressure tests.
ISO167501
2ND
Road vehicles - environmental conditions and testing for electrical and
electronic equipment - part 1: general.
ISO167502
2ND
Road vehicles - environmental conditions and testing for electrical and
electronic equipment - part 2: electrical loads.
ISO167503
2ND
Road vehicles - environmental conditions and testing for electrical and
electronic equipment - part 3: mechanical loads.
ISO167504
2ND
Road vehicles - environmental conditions and testing for electrical and
electronic equipment - part 4: climatic loads.
IEC60529
2.1 w/COR2
Degrees of protection provided by enclosures (IP code).
IEC60068217
4.0
Basic environmental testing procedures - part 2: Test Q: sealing.
IEC60068218
2.0
Environmental testing - part 2-18: Tests - R and guidance: water.
IEC60068270
1.0
Environmental testing - part 2: tests - test XB: abrasion of markings and
letterings caused by rubbing of fingers and hands.
IEC60068268
1.0
Environmental testing - part 2: tests - test l: dust and sand.
IEC60068211
3.0
Basic environmental testing procedures, part 2: test KA: salt mist.
IEC60068260
2.0
Environmental testing - part 2: Test KE: flowing mixed gas corrosion test.
IEC60068252
2.0 w/COR
Environmental testing - part 2: Test KB: salt mist, cyclic (sodium chloride
solution).
8.3. Environmental Specifications
The USR3500 is compliant with the operating classes listed below. The ideal
temperature range of the environment for each operating class is also specified.
Table 38. Operating Class Temperature Range
Conditions
Temperature Range
Operating / Class A
-20 °C to +55°C
Operating / Class B*
-30 °C to +75°C
Operating / Class C*
-30 °C to +85°C
Storage*
-40 °C to +85°C
* Refer to the Footnotes of Table 29 Real Time Clock Specifications for RTC battery related issues.
Rev 1.0 1/27/14 52
Reference Guide
Reliability Compliance and
Recommended Standards
8.3.1. Function Status Classification
The classes reported below comply with the Annex “ISO Failure Mode Severity
Classification”, ISO Standard 7637, and Section 1.
Note: The word “function” used here only concerns the function performed by the modem.
Table 39. ISO Failure Mode Severity Classification
Class
Definition
CLASS A
All equipment/system functions are fulfilled normally (100% functional) during and after the
constraint.
The modem shall exhibit normal function during and after environmental exposure. The
modem performance shall meet the minimum requirements of 3GPP or appropriate wireless
standards.
CLASS B
All equipment/system functions are fulfilled normally during application of the constraint;
however, one or several of them may be out of the specified tolerances. After application of the
constraint, all functions automatically return within standard limits. The memories shall remain
in compliance with Class A.
The modem shall exhibit the possibility at all times to establish a voice, SMS or DATA call.
Unless otherwise stated, full performance should return to normal after the external influence
has been removed.
CLASS C
No functional requirement will be fulfilled during the application of the constraint; however, full
functionality will automatically be returned after the constraint has been removed.
Rev 1.0 1/27/14 53
9. Certification Compliance and
Recommended Standards
9.1. Certification Compliance
Refer to the following tables for the requirements compliance of the USR3500.
Table 40. Standards Conformity for USR3500
Domain
Applicable Standard
Safety & Health
IEC 60950:2005+A1:2009
EN 60950:2006+A11:2009+A1:2010+A12:2011
EN 62311: 2008
Efficient use of the radio frequency spectrum
EN 301 440-1, v1.6.1
EN 301 440-2 v1.4.1
EN 301 511, v9.0.2
EN 301 908-1, v4.2.1
EN 301 908-2, v5.2.1
EMC
EN 301 489-1, v1.9.2
EN 301 489-3, v1.4.1
EN 301 489-7, v1.3.1
EN 301 489-24, v1.5.1
FCC
FCC Part 22, 24
IC
RSS-132 Issue 2
RSS-133 Issue 5
International Standard for Battery
IEC 61951-2
Rev 1.0 1/27/14 54
Reference Guide
Certification Compliance and
Recommended Standards
9.2. Applicable Standards Listing
The table hereafter gives the basic list of standards applicable for 2G and 3G
(HSPA).
Note: References to any features can be found from these standards.
Table 41. Applicable Standards and Requirements for USR3500
Document
Current
Version
Title
GCF-CC
3.46.0
GSM Certification Forum-Certification Criteria
NAPRD.03
5.11
Overview of PCS Type certification review board (PTCRB) Mobile Equipment
Type Certification and IMEI control
TS 51.010-1
10.1.0
3rd Generation Partnership Project; Technical Specification Group GSM/EDGE
Radio Access Network; Digital cellular telecommunications system (Phase 2+);
Mobile Station (MS) conformance specification; Part 1: Conformance
specification
TS 51.010-2
10.1.0
3rd Generation Partnership Project; Technical Specification Group GSM/EDGE
Radio Access Network; Mobile Station (MS) conformance specification; Part 2:
Protocol Implementation Conformance Statement (PICS) proforma specification
TS 51.010-4
4.23.0
3rd Generation Partnership Project; Technical Specification Group GSM/EDGE
Radio Access Network; Digital cellular telecommunications system (Phase 2+);
Mobile Station (MS) conformance specification; Part 4: SIM Application Toolkit
Conformance specification
EN 301 511
9.0.2
Global System for Mobile Communications (GSM); Harmonized standard for
mobile stations in the GSM 900 and DCS 1800 bands covering essential
requirements under article 3.2 of the R&TTE directive (1999/5/EC)
EN 301 908-2
5.2.1
Global System for Mobile Communications (GSM); Harmonized standard for
mobile stations in the GSM 900 and DCS 1800 bands covering essential
requirements under article 3.2 of the R&TTE directive (1999/5/EC)
Rev 1.0 1/27/14 55
10. Safety Recommendations
10.1. General Safety
For the efficient and safe operation of your programmable modem, please read the
following information carefully.
It is important to follow any special regulations regarding the use of radio equipment
due in particular to the possibility of radio frequency (RF) interference. Carefully
follow the safety advice given.
Switch OFF your programmable modem:
• When in an aircraft. The use of cellular telephones in an aircraft may
endanger the operation of the aircraft, disrupt the cellular network and is
illegal. Failure to observe this instruction may lead to suspension or denial of
cellular telephone services to the offender, or legal action or both,
• When at a refueling point,
• When in any area with a potentially explosive atmosphere which could cause
an explosion or fire,
• In hospitals and any other place where medical equipment may be in use.
Respect restrictions on the use of radio equipment in:
• Fuel depots,
• Chemical plants,
• Places where blasting operations are in progress,
• Any area where the use of a cellular telephone is forbidden or dangerous.
• Any other area where you would normally be advised to turn off your vehicle
engine.
Turn your modem OFF when in any area with a potentially explosive atmosphere. It
is rare, but your modem or its accessories could generate sparks. Sparks in such
areas could cause an explosion or fire resulting in bodily injuries or even death.
Areas with a potentially explosive atmosphere are often, but not always, clearly
marked. They include below decks on boats and areas where the air contains
chemicals or particles, such as grain, dust, or metal powders.
Do not transport or store flammable gas, liquid, or explosives, in the compartment of
your vehicle which contains your modem or accessories.
Before using your modem in a vehicle powered by liquefied petroleum gas (such as
propane or butane) ensure that the vehicle complies with the relevant fire and safety
regulations of the country in which the vehicle is to be used.
Rev 1.0 1/27/14 56
Reference Guide
Safety Recommendations
There may be a hazard associated with the operation of your USR3500 close to
inadequately protected personal medical devices such as hearing aids and
pacemakers. Consult the manufacturers of the medical device to determine if it is
adequately protected.
Operation of your USR3500 close to other electronic equipment may also cause
interference if the equipment is inadequately protected. Observe any warning signs
and manufacturers’ recommendations.
The USR3500 is designed for and intended to be used in "fixed" and "mobile"
applications:
"Fixed" means that the device is physically secured at one location and is not able
to be easily moved to another location.
"Mobile" means that the device is designed to be used in other than fixed locations
and generally in such a way that a separation distance of at least 20 cm (8 inches) is
normally maintained between the transmitter’s antenna and the body of the user or
nearby persons.
The USR3500 is not designed for nor intended to be used in portable applications
(within 20 cm or 8 inches of the body of the user) and such uses are strictly
prohibited.
Rev 1.0 1/27/14 57
Reference Guide
Safety Recommendations
10.2. RF Safety
10.2.1. General
Your GSM modem is based on the GSM standard for cellular technology. The GSM
standard is spread all over the world. It covers Europe, Asia and some parts of
America and Africa. This is the most used telecommunication standard.
Your GSM modem is actually a low power radio transmitter and receiver. It sends out
and receives radio frequency energy. When you use your GSM application, the
cellular system which handles your calls controls both the radio frequency and the
power level of your cellular modem.
10.2.2. Exposure to RF Energy
There has been some public concern about possible health effects of using GSM
modems. Although research on health effects from RF energy has focused on the
current RF technology for many years, scientists have begun research regarding
newer radio technologies, such as GSM. After existing research had been reviewed,
and after compliance to all applicable safety standards had been tested, it has been
concluded that the product was acceptable for use.
If you are concerned about exposure to RF energy there are things you can do to
minimize exposure. Obviously, limiting the duration of your calls will reduce your
exposure to RF energy. In addition, you can reduce RF exposure by operating your
cellular modem efficiently by following the below guidelines.
10.2.3. Efficient Modem Operation
For your GSM modem to operate at the lowest power level, consistent with
satisfactory connection quality:
Do not hold the antenna when the modem is « IN USE ». Holding the antenna affects
connection quality and may cause the modem to operate at a higher power level
than needed.
10.3. Vehicle Safety
Do not use your USR3500 while driving, unless equipped with a correctly installed
vehicle kit allowing ‘Hands-Free’ Operation.
Respect national regulations on the use of cellular telephones in vehicles. Road
safety always comes first.
If incorrectly installed in a vehicle, the operation of the USR3500 could interfere with
the correct functioning of vehicle electronics. To avoid such problems, make sure
Rev 1.0 1/27/14 58
Reference Guide
Safety Recommendations
that the installation has been performed by qualified personnel. Verification of the
protection of vehicle electronics should form part of the installation.
The use of an alert device to operate a vehicle’s lights or horn on public roads is not
permitted.
10.4. Care and Maintenance
Your USR3500 is the product of advanced engineering, design and craftsmanship
and should be treated with care. The suggestion below will help you to enjoy this
product for many years.
Do not expose the USR3500 to any extreme environment where the temperature or
humidity is high.
Do not use or store the USR3500 in dusty or dirty areas. Its moving parts can be
damaged.
Do not attempt to disassemble the modem. There are no user serviceable parts
inside.
Do not expose the USR3500 to water, rain or beverages. It is not waterproof.
Do not abuse your USR3500 by dropping, knocking, or violently shaking it. Rough
handling can damage it.
Do not place the USR3500 alongside computer discs, credit or travel cards or other
magnetic media. The information contained on discs or cards may be affected by the
embedded module.
The use of third party equipment or accessories not authorized by USRobotics may
invalidate the warranty of the modem.
Contact USRobotics in the unlikely event of a modem failure.
10.5. Your Responsibility
This USR3500 is under your responsibility. Please treat it with care, respecting all
local regulations. It is not a toy. Therefore, keep it in a safe place at all times and out
of the reach of children.
Remember your Unlock and PIN codes. Become familiar with and use the security
features to block unauthorized use and theft.
Rev 1.0 1/27/14 59
11. Reference Documents
For more details, several reference documents can be consulted. The documents
referenced herein are provided by USRobotics. Visit the USRobotics website at
http://www.usr.com/ for the latest documentation available.
11.1. Firmware Documentation
[3] AT Commands Interface Guide
[4] Customer Release Notes for Firmware 7.52 A1
11.2. Expansion Card Documentation
[5] Ethernet Expansion Card User Guide
Rev 1.0 1/27/14 60
12. List of Abbreviations
Abbreviation
Definition
AC
Alternating Current
ACM
Accumulated Call Meter
AMR
Adaptive Multi-Rate
AT
ATtention (prefix for Wireless CPU® commands)
CLK
CLocK
CMOS
Complementary Metal Oxide Semiconductor
CS
Coding Scheme
CTS
Clear To Send
dB
Decibel
dBc
Decibel relative to the Carrier power
dBi
Decibel relative to an Isotropic radiator
dBm
Decibel relative to one milliwatt
DC
Direct Current
DCD
Data Carrier Detect
DCE
Data Communication Equipment
DCS
Digital Cellular System
DSR
Data Set Ready
DTE
Data Terminal Equipment
DTMF
Dual Tone Multi-Frequency
DTR
Data Terminal Ready
EEPROM
Electrically Erasable Programmable Read-Only Memory
EFR
Enhanced Full Rate
E-GSM
Extended GSM
EMC
ElectroMagnetic Compatibility
EMI
ElectroMagnetic Interference
ESD
ElectroStatic Discharges
ETSI
European Telecommunications Standards Institute
FIT
Series of connectors (micro-FIT)
FR
Full Rate
FTA
Full Type Approval
GCF
Global Certification Forum
GND
GrouND
GPIO
General Purpose Input Output
GPRS
General Packet Radio Service
GSM
Global System for Mobile communications
HR
Half Rate
HSDPA
High Speed Downlink Packet Access
HSPA
High Speed Packet Access
HSUPA
High Speed Uplink Packet Access
I
Input
Rev 1.0 1/27/14 61
Reference Guide
List of Abbreviations
Abbreviation
Definition
IEC
International Electrotechnical Commission
IES
Internal Expansion Socket
IESM
Internal Expansion Socket Module
IMEI
International Mobile Equipment Identification
I/O
Input / Output
LED
Light Emitting Diode
MAX
MAXimum
ME
Mobile Equipment
MIC
MICrophone
Micro-Fit
Family of connectors from Molex
MIN
MINimum
MNP
Microcom Networking Protocol
MO
Mobile Originated
MS
Mobile Station
MT
Mobile Terminated
NOM
NOMinal
O
Output
Pa
Pascal (for speaker sound pressure measurements)
PBCCH
Packet Broadcast Control Channel
PC
Personal Computer
PCL
Power Control Level
PDP
Packet Data Protocol
PIN
Personal Identity Number
PLMN
Public Land Mobile Network
PUK
Personal Unblocking Key
RF
Radio Frequency
RFI
Radio Frequency Interference
RI
Ring Indicator
RMS
Root Mean Square
RTS
Request To Send
RX
Receive
SIM
Subscriber Identification Module
SMA
SubMiniature version A RF connector
SMS
Short Message Service
SNR
Signal-to-Noise Ratio
SPL
Sound Pressure Level
SPK
SpeaKer
SRAM
Static RAM
TCP/IP
Transmission Control Protocol / Internet Protocol
TDMA
Time Division Multiple Access
TU
Typical Urban fading profile
TUHigh
Typical Urban, High speed fading profile
TX
Transmit
Rev 1.0 1/27/14 62
Reference Guide
List of Abbreviations
Abbreviation
Definition
TYP
TYPical
UMTS
Universal Mobile Telecommunications System
VSWR
Voltage Standing Wave Ratio
Rev 1.0 1/27/14 63
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