SIRETTA ZETA Series Quick user guide

ZETA Series
GPRS/UMTS/LTE Modem with GPIO
Hardware Reference Manual
Rev 1.6
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A member of the Olancha Group Ltd
Registered in England No. 08405712
VAT Registration No. GB163 04 0349
Siretta Ltd
Basingstoke Road
Spencers Wood
Reading
Berkshire RG7 1PW
sales
fax
email
web
[phone]
[phone]
[email protected]
www.siretta.co.uk
2
ZETA Series
GPRS/UMTS/LTE Terminal with GPIO
Table of Contents
Page
Introduction 3
About Siretta 4
General Description 5
Specications 5
AT Commands 7
ZETA Interface 8
System Diagram 10
System Overview 11
Modes of Operation 12
Ordering Information 13
Dimensions 14
ZETA Series Images 17
ZETA LED Indicators 18
Power LED Control Status
User Programmable LED Status Control 19
Modem States 20
Interfaces 21
RS232 Serial Port Interface 21
USB Serial Port Interface 23
USB Interface Drivers 25
GPIO 10-Way Connector 26
Digital Functions 28
Digital Output 28
Digital Input 29
SIM Socket 30
SIM Requirements 30
Antenna Connectors 31
GSM/UMTS Antenna Connector 31
GPS Antenna Connector (Optional) 33
GPS 34
ZETA-G-GPRS Modem 34
ZETA-G-UMTS Modem 34
GPS Performance (ZETA-G Variants) 34
Power 36
RJ12 Power Connector 36
Power Supply Requirements 37
Power Consumption 39
Switching the Modem ON/OFF 40
Embedded Software Support 42
Telit AppZone 42
Telit Easy Script in Python 43
Siretta Recommends 44
Installation 46
Considerations for Installations
Incorporating the ZETA
46
Power Supply Installation 47
Securing the Modem 47
Safety and Product Care 48
General Precautions 48
SIM Card Precautions 48
Antenna Precautions 49
Exposure to RF Energy 49
Safety Recommendations 51
Conformity Assessment 52
Disclaimer 53
Denitions 54
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A member of the Olancha Group Ltd
Registered in England No. 08405712
VAT Registration No. GB163 04 0349
Siretta Ltd
Basingstoke Road
Spencers Wood
Reading
Berkshire RG7 1PW
sales
fax
email
web
[phone]
[phone]
[email protected]
www.siretta.co.uk
3
ZETA Series
GPRS/UMTS/LTE Terminal with GPIO
This document is intended to provide guidance when adding a modem from the
ZETA series to your system.
The ZETA series of GPRS/UMTS/LTE M2M modems are an advanced range of
high performance modems developed for easy integration into existing systems
and for embedded application development.
The ZETA modem range is based on the Telit xE910 GPRS/UMTS/LTE module
series and is available with or without GPS. The modem manages the module
power up sequence and can be programmed to perform additional custom tasks.
This document* discusses the modems states and modes of operation in addition
to the electrical characteristics of the modems interfaces.
Introduction
*This manual doesn’t cover the ZETA-N-GPRS. For technical information on the ZETA-N-
GPRS, please see the ZETA-N-GPRS Hardware Reference Manual.
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A member of the Olancha Group Ltd
Registered in England No. 08405712
VAT Registration No. GB163 04 0349
Siretta Ltd
Basingstoke Road
Spencers Wood
Reading
Berkshire RG7 1PW
sales
fax
email
web
[phone]
[phone]
[email protected]
www.siretta.co.uk
4
ZETA Series
GPRS/UMTS/LTE Terminal with GPIO
Siretta, located in Reading, United Kingdom have been manufacturing antennas,
cable assemblies and cellular modems for over 10 years. We supply our products
globally to many of the world’s leading organisations.
Whether you require an off the shelf or custom solution, Siretta has a wide portfolio of
antenna, RF cable assemblies and modems to t your application.
Our extensive knowledge and experience in the wireless market allows us to support
a wide range of customer applications, focusing on frequencies typically within the
75MHz - 5.8GHz range. These encompass the HF, VHF, ISM, GSM/GPRS/3G/4G
and GPS frequencies as well as industrial WLAN and VHF/UHF antenna/Wi-Fi
antenna solutions.
With a heavy emphasis on design, we have a team of dedicated Application
Engineers and Product Managers, backed up by Field Sales Engineers, who
specialise in wireless applications.
We have made signicant investments in R&D facilities which boast GPS hardware
development equipment and a GSM Pico Cell on site, as well as development
software and a comprehensive suite of Industrial, Scientic and Medical band, and
non ISM band frequency products. We have many technology partners enabling us to
keep at the forefront of the communications industry and offer class leading wireless
solutions.
About Siretta
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A member of the Olancha Group Ltd
Registered in England No. 08405712
VAT Registration No. GB163 04 0349
Siretta Ltd
Basingstoke Road
Spencers Wood
Reading
Berkshire RG7 1PW
sales
fax
email
web
[phone]
[phone]
[email protected]
www.siretta.co.uk
5
ZETA Series
GPRS/UMTS/LTE Terminal with GPIO
Specications
ZETA-GPRS ZETA-UMTS ZETA-LTE
2G frequency band: 850, 900, 1800, 1900MHz 850, 900, 1800, 1900MHz (EU) 900, 1800MHz
3G frequency band: - 800/850, 900, 1700, 1900,
2100MHz
850, 900, 2100MHz
4G frequency band: - - 800, 1800, 2600MHz
GPS support (optional): GPS, Glonass, Galileo, QZSS GPS GPS
Dimensions: 93 x 67 x 28mm 93 x 67 x 28mm 93 x 67 x 28mm
Weight: 101g 101g 101g
Supply voltage: 5 - 42V 5 - 42V 5 - 42V
Operating temperature: -30 to +80°C -30 to +80 °C -30 to +80 °C
GSM antenna connector: SMA Female SMA Female SMA Female
GPS antenna connector
(optional): SMA Female SMA Female SMA Female
The ZETA range of GPRS/UMTS/LTE modems are amongst the most versatile
modem series available today. The ZETA series offers a range of interface options
including USB and RS232 serial port communication, 2 x general purpose inputs, 1 x
general purpose output, 2 x general purpose input/outputs as well as 1 x ADC input.
In addition to this, the ZETA series provides a 3.3V reference power supply output to
use with external equipment and can be congured to offer 2 independent serial ports
into the modem.
The ZETA contains a powerful Python interpretor which will run user uploaded Python
scripts. These allow the user to develop and run their own scripts on the modem.
This is an easy way to add additional functionality with the minimum of time, effort
and cost.
General Description
Table 1. Specications of the ZETA modem
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A member of the Olancha Group Ltd
Registered in England No. 08405712
VAT Registration No. GB163 04 0349
Siretta Ltd
Basingstoke Road
Spencers Wood
Reading
Berkshire RG7 1PW
sales
fax
email
web
[phone]
[phone]
[email protected]
www.siretta.co.uk
6
ZETA Series
GPRS/UMTS/LTE Terminal with GPIO
Table 2. Modem data transfer speeds
Model Region Coverage Max Download Max Upload
ZETA-N-GPRS Global 236.8Kbps 59.2Kbps
ZETA-G-GPRS Global 236.8Kbps 59.2Kbps
ZETA-N-UMTS Global 21Mbps 5.76Mbps
ZETA-G-UMTS Global 21Mbps 5.76Mbps
ZETA-N-UMTS (EU) (Europe) 7.2Mbps 5.76Mbps
ZETA-G-UMTS (EU) (Europe) 7.2Mbps 5.76Mbps
ZETA-N-LTE (EU) (Europe) 100Mbps 50Mbps
ZETA-G-LTE (EU) (Europe) 100Mbps 50Mbps
NOTE - For part numbering and ordering information see page 13
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A member of the Olancha Group Ltd
Registered in England No. 08405712
VAT Registration No. GB163 04 0349
Siretta Ltd
Basingstoke Road
Spencers Wood
Reading
Berkshire RG7 1PW
sales
fax
email
web
[phone]
[phone]
[email protected]
www.siretta.co.uk
7
ZETA Series
GPRS/UMTS/LTE Terminal with GPIO
AT Commands
The ZETA range of wireless modems has a GSM engine at its heart which can be
controlled via the serial interface using standard AT commands.
The AT command is an ATTENTION command and is used as a prex to other
parameters in a formatted string. The AT command combined with other parameters
can be sent to the modem with your preferred terminal emulator package (TMSTerm/
TeraTerm/HyperTerminal) and typed in manually as a command line instruction.
The wireless module is compliant with the following AT command formats:
1) Hayes standard AT command set, in order to maintain the compatibility with
existing SW programs.
2) 3GPP 27.007 specic AT command and GPRS specic commands.
3) 3GPP 27.005 specic AT commands for SMS (Short Message Service) and CBS
(Cell Broadcast Service)
4) FAX Class 1 compatible commands
5) Proprietary command set, the module family also supports a proprietary set of AT
commands for special purposes outside of the standard AT specication.
To obtain the latest AT command reference guide* with a full list of supported AT
commands, please contact your Siretta representative or alternatively visit:
www.siretta.co.uk
NOTE - This following document refers to useful AT commands throughout and offers
descriptions of how to use the AT commands with the ZETA wireless modems.
*For GPRS modems refer to the GPRS AT Command Manual, for UMTS modems refer to the
UMTS AT Command Manual.
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A member of the Olancha Group Ltd
Registered in England No. 08405712
VAT Registration No. GB163 04 0349
Siretta Ltd
Basingstoke Road
Spencers Wood
Reading
Berkshire RG7 1PW
sales
fax
email
web
[phone]
[phone]
[email protected]
www.siretta.co.uk
8
ZETA Series
GPRS/UMTS/LTE Terminal with GPIO
ZETA Interface
Standard Hardware Interfaces
The ZETA series modem comes with the following interfaces:
»1 x RS232 serial port interface for direct serial connection to module
»1 x RJ12 power connection with 2 power lines (5 - 42V) and 4 input interfaces
»1 x SMA female GSM antenna connector
»1 x SIM card reader (push-push)
»3 x external LED status indicators (Red, Blue, Green)
»10-Way connector
○1 x wired (10-way) RS232 debug port for direct serial connection to module
○1 x wired (10-way) 3.3V power supply output interface
○1 x wired (10-way) 12-bit ADC interfaces (42V tolerant)
○2 x wired (10-way) general purpose input interfaces
○1 x wired (10-way) general purpose output interface
○2 x wired (10-way) general purpose input/output interfaces
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A member of the Olancha Group Ltd
Registered in England No. 08405712
VAT Registration No. GB163 04 0349
Siretta Ltd
Basingstoke Road
Spencers Wood
Reading
Berkshire RG7 1PW
sales
fax
email
web
[phone]
[phone]
[email protected]
www.siretta.co.uk
9
ZETA Series
GPRS/UMTS/LTE Terminal with GPIO
Optional Coverage
The ZETA series modems have the following coverage options available:
»(EU) European Union
»(NA) North America
»(GL) Global
Optional Technologies
The ZETA series modems have the following optional technologies available:
»GPRS (2G)
»UMTS (3G)
»LTE (4G)
Optional Modem Features*
Optional Hardware
The ZETA series modems have the following optional hardware features:
»High performance SirfStarIV GPS engine (Options available for GPS/Glonass/Galileo/QZSS)
*To add optional features on your modem, see ordering Information on page 13
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A member of the Olancha Group Ltd
Registered in England No. 08405712
VAT Registration No. GB163 04 0349
Siretta Ltd
Basingstoke Road
Spencers Wood
Reading
Berkshire RG7 1PW
sales
fax
email
web
[phone]
[phone]
[email protected]
www.siretta.co.uk
10
ZETA Series
GPRS/UMTS/LTE Terminal with GPIO
System Diagram
Figure 1. ZETA system diagram
The ZETA series is a versatile range of modems offering multiple communication
channels and interfaces to connect into other systems. The system diagram below
gives a visual representation of the ZETA interfaces available to the user and shows
the various subsections which make up the complete ZETA modem.
GSM
5 - 42V
PSU Power Input
SIM
RS232 Serial Port Interface
Visual Indicators
Debug Serial Port
10-way Connector Interfaces
Power Supply Subsection
Communication Subsection
2 x I
USB Port
1 x O
2 x I/O
1 x ADC
GPS
Telit xE910 Module
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A member of the Olancha Group Ltd
Registered in England No. 08405712
VAT Registration No. GB163 04 0349
Siretta Ltd
Basingstoke Road
Spencers Wood
Reading
Berkshire RG7 1PW
sales
fax
email
web
[phone]
[phone]
[email protected]
www.siretta.co.uk
11
ZETA Series
GPRS/UMTS/LTE Terminal with GPIO
This ZETA can be used in a number of applications, some examples are shown
below:
»GPIO Monitor (Monitor/Set and report on GPIO status)
»Standard RS232 modem attached to existing equipment (PC/MAC/Server etc.)
Typically connected devices are:
»PC/MAC/Linux platforms for use as modem
»Embedded (connected directly to remote equipment without a PC attached)
Operating System Connected Modem
»Internet enable a remote device with RS232 connectivity over 2.5G/3G. Internet
connectivity can be retrotted to end equipment without changing the software or
conguration of the remote device.
»Used in countries or places where broadband and WiFi is a less common method
to connect to the internet or where services are unavailable. The ZETA modem
can overcome this restriction by providing a mobile internet solution over the
GPRS/3G network.
System Overview
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A member of the Olancha Group Ltd
Registered in England No. 08405712
VAT Registration No. GB163 04 0349
Siretta Ltd
Basingstoke Road
Spencers Wood
Reading
Berkshire RG7 1PW
sales
fax
email
web
[phone]
[phone]
[email protected]
www.siretta.co.uk
12
ZETA Series
GPRS/UMTS/LTE Terminal with GPIO
Examples:
»Vending machine where the head ofce would poll for drinks remaining/money
taken etc. This would be an on-demand pull to obtain results in real time.
»Monitoring AMR/temperature/equipment in a home, i.e. Interrogate lights etc.
»Monitoring GPIO, i.e. Open doors/windows
»Remote entry system, i.e. Send a message to the modem to open a gate/door to
allow access.
»Streaming live data from remote system to a central location
»Remote printing applications (remotely print over the GPRS network)
»Polling remote devices for information to prevent an engineer callout
USB Interface
This is a USB standard Communication Device Class (CDC) device. A device driver
is available for Windows OS. Linux uses standard CDC ACM drivers. Please contact
your siretta representative for more information.
Modes of Operation
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A member of the Olancha Group Ltd
Registered in England No. 08405712
VAT Registration No. GB163 04 0349
Siretta Ltd
Basingstoke Road
Spencers Wood
Reading
Berkshire RG7 1PW
sales
fax
email
web
[phone]
[phone]
[email protected]
www.siretta.co.uk
13
ZETA Series
GPRS/UMTS/LTE Terminal with GPIO
Ordering Information
ZETA X XXXX (XX)
Module Type
N = Without GPS
G = With GPS
Product Module Version
GPRS = GPRS Technology
UMTS = UMTS Technology
LTE = LTE Technology
Coverage Options
(EU) = European Coverage of GSM and UMTS Only
(NA) = North American Coverage of GSM and UMTS Only
(GL) = Global Coverage of GSM and UMTS Only
Part Numbering Examples
»ZETA-N-GPRS = GPRS Modem with GPIO, without GPS
»ZETA-G-UMTS (EU) = EU Coverage UMTS and GPS Modem with GPIO
Modem Identier
ZETA = Intelligent Siretta Modem with GPIO
- -
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A member of the Olancha Group Ltd
Registered in England No. 08405712
VAT Registration No. GB163 04 0349
Siretta Ltd
Basingstoke Road
Spencers Wood
Reading
Berkshire RG7 1PW
sales
fax
email
web
[phone]
[phone]
[email protected]
www.siretta.co.uk
14
ZETA Series
GPRS/UMTS/LTE Terminal with GPIO
Dimensions

All dimensions are shown in mm. The mounting holes are suitable for a M3 xing
screwing. These drawings are relevant for the entire ZETA series modems.
Figure 3. ZETA modem serial connector view - dimensions
Figure 2. ZETA modem GPIO 10-way connector, SIM holder and LED indicator view - dimensions
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A member of the Olancha Group Ltd
Registered in England No. 08405712
VAT Registration No. GB163 04 0349
Siretta Ltd
Basingstoke Road
Spencers Wood
Reading
Berkshire RG7 1PW
sales
fax
email
web
[phone]
[phone]
[email protected]
www.siretta.co.uk
15
ZETA Series
GPRS/UMTS/LTE Terminal with GPIO
Figure 5. ZETA-N modem antenna and power view - dimensions
All dimensions are shown in mm. The mounting holes are suitable for a M3 xing
screwing. These drawings are relevant for the ZETA-N modems.
ZETA-N Modems

Figure 4. ZETA-N modem top view - dimensions
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A member of the Olancha Group Ltd
Registered in England No. 08405712
VAT Registration No. GB163 04 0349
Siretta Ltd
Basingstoke Road
Spencers Wood
Reading
Berkshire RG7 1PW
sales
fax
email
web
[phone]
[phone]
[email protected]
www.siretta.co.uk
16
ZETA Series
GPRS/UMTS/LTE Terminal with GPIO
28
67
15.25 17.55
15.4
17.5
FRONT ELEVATION
100
SIDE ELEVATIONSIDE ELEVATION
100
55
19
45 11
PLAN
1:1 @ A3 Sheet Size
A
B
C
D
E
F
G
H
I
7 6
5 4
3
I
H
G
F
E
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A
1
AMENDMENTS JOB NUMBER DRAWING TITLE STATUS PROJECT INFO
COPYRIGHT WARNING These drawings and designs remain the property of Sequoia Technology Group. Any unauthorised use will render the offender liable for damages.
ALL DIMENSIONS ARE IN UNLESS OTHERWISE STATED
Sheet1
DRAWING: X:\Sequoia Design\Sequoia\SQ864\ SQ864 Dual Antenna
MODEL: X:\Sequoia Design\Sequoia\SQ864\ SQ864 v2.0
DESIGNER
03/05/2013
ISSUE DATE
DO NOT SCALE OFF DRAWING EMAIL [email protected] FOR DXFS OR OTHER SCALABLE FILES.
Page No: 01 /01
GENERAL NOTES:
PART NUMBER
REV
SCALE
All dimensions are shown in mm. The mounting holes are suitable for a M3 xing
screwing. These drawings are relevant for the ZETA-G modems.
ZETA-G
Figure 7. ZETA-G modem antenna and power view - dimensions
Figure 6. ZETA-G modem top view - dimensions
28
67
15.25 17.55
15.4
17.5
FRONT ELEVATION
100
SIDE ELEVATIONSIDE ELEVATION
100
55
19
45 11
PLAN
1:1 @ A3 Sheet Size
A B C D E F G H I
7
6
5
4
3
I H G F E D C B
2
A
1
AMENDMENTS
JOB NUMBER
DRAWING TITLE
STATUS
PROJECT INFO
COPYRIGHT WARNING
These drawings and designs remain
the property of Sequoia Technology
Group. Any unauthorised use will
render the offender liable for damages.
ALL DIMENSIONS ARE IN UNLESS OTHERWISE STATED
Sheet1
DRAWING: X:\Sequoia Design\Sequoia\SQ864\ SQ864 Dual Antenna
MODEL: X:\Sequoia Design\Sequoia\SQ864\ SQ864 v2.0
DESIGNER
03/05/2013
ISSUE DATE
DO NOT SCALE OFF DRAWING
EMAIL [email protected] FOR DXFS OR OTHER
SCALABLE FILES.
Page No: 01 /01
GENERAL NOTES:
PART NUMBER
REV
SCALE
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A member of the Olancha Group Ltd
Registered in England No. 08405712
VAT Registration No. GB163 04 0349
Siretta Ltd
Basingstoke Road
Spencers Wood
Reading
Berkshire RG7 1PW
sales
fax
email
web
[phone]
[phone]
[email protected]
www.siretta.co.uk
17
ZETA Series
GPRS/UMTS/LTE Terminal with GPIO
ZETA Series Images
Figure 8. ZETA-N variant Figure 9. ZETA-G variant
Figure 10. 3D view of the ZETA
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A member of the Olancha Group Ltd
Registered in England No. 08405712
VAT Registration No. GB163 04 0349
Siretta Ltd
Basingstoke Road
Spencers Wood
Reading
Berkshire RG7 1PW
sales
fax
email
web
[phone]
[phone]
[email protected]
www.siretta.co.uk
18
ZETA Series
GPRS/UMTS/LTE Terminal with GPIO
ZETA LED Indicators
There are 3 LED outputs on the ZETA modem that can be congured simply and
easily to indicate the functional/operational state of the modem. This can be done via
software conguration.
The red status LED is driven directly by the GSM engine within the modem to indicate
GSM network registration status. Please refer to table 3 below for more information.
Table 3. LEDs
LEDs Description
Red Congurable via software control (default setting to show visual indication of
network registration status. Please see AT#SLED command.)*
Green Power up control status** - Congurable via software control***
Blue Power up control status** - Congurable via software control***
Figure 11. LEDs
Red LED
Blue LED
Green LED
*LED default state is off. Need to congure AT#SLED command to enable software control of
LED ashing state.
AT#GPIO=1,0,2
AT#SLED=2
AT#SLEDSAV
**See ‘Power Status LED’ section on page 19.
***See ‘User Programmable LED Status Control’ section on page 19.
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A member of the Olancha Group Ltd
Registered in England No. 08405712
VAT Registration No. GB163 04 0349
Siretta Ltd
Basingstoke Road
Spencers Wood
Reading
Berkshire RG7 1PW
sales
fax
email
web
[phone]
[phone]
[email protected]
www.siretta.co.uk
19
ZETA Series
GPRS/UMTS/LTE Terminal with GPIO
The green and blue LED’s can be controlled by the modem using the module general
purpose outputs.
The GPIO lines on the embedded module can be congured to control the LED
indicators directly. This allows the embedded modem to control the LED’s via
standard AT commands or using python to indicate modem status to the user.
Example AT Commands to Control LED Status
In the examples shown below the following AT commands can be entered on the
modem to directly control the user programmable LED’s. (The ZETA green LED is
directly connected to GPIO2 and the ZETA blue LED is directly connected to GPIO3).
AT#GPIO=2,1,1 (switch general purpose output 2 on, connected to green LED)
AT#GPIO=2,0,1 (switch general purpose output 2 off, connected to green LED)
AT#GPIO=3,1,1 (switch general purpose output 3 on, connected to blue LED)
AT#GPIO=3,0,1 (switch general purpose output 3 off, connected to blue LED)
User Programmable LED Status Control
During the power up and power down procedure the control of the blue and green
LED’s is managed by the internal CPLD. The status of the LED’s is as follows:
Power up procedure (When mains power is applied or when PWRON_IN is
enabled - Pin 4 RJ12 connector)
1) Green led ashes 300ms on / 300ms off whilst the CPLD performs the power up
process
2) After around 15-20 seconds the red LED will permanently illuminate indicating
that the modem is powered up and searching for a cellular network
3) After the modem has powered up correctly the control of the green and blue
LED’s is passed to the modem via GPIO 2 and GPIO 3 (See Example AT
Commands to Control LED Status)
Power up procedure (When PWROFF_IN is enabled - Pin 3 RJ12 connector)
1) Control of the green and blue LED’s is passes to the CPLD
2) Green led ashes 300ms on / 300ms off whilst the CPLD performs the power off
process
3) After around 5-10 seconds the red LED will go out indicating that the modem is
powered off
4) After the modem has powered off green LED’s will go out
Power LED Control Status
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A member of the Olancha Group Ltd
Registered in England No. 08405712
VAT Registration No. GB163 04 0349
Siretta Ltd
Basingstoke Road
Spencers Wood
Reading
Berkshire RG7 1PW
sales
fax
email
web
[phone]
[phone]
[email protected]
www.siretta.co.uk
20
ZETA Series
GPRS/UMTS/LTE Terminal with GPIO
Table 4. Modem states (assume AT#SLED=2*)
Current Modem State Input Next state Indication of new state
Power Off Connect power Run Mode
Green LED will ash 300ms on /
300ms off then red LED will be on
continuously*
Run Mode Insert a valid SIM card On Network Red LED will ash once every 3
seconds*
On Network
Hold PWROFF_IN (Pin 3 -
RJ12 Power connector) to
0.5V - 42V for >0.5 seconds
Power off Green LED will ash 300ms on /
300ms off**
Run Mode
Hold PWROFF_IN (Pin 3 -
RJ12 Power connector) to
0.5V - 42V for >0.5 seconds
Power off Green LED will ash 300ms on /
300ms off**
Power Off
Hold PWRON_IN (Pin 4 -
RJ12 Power connector) to
0.5V - 42V for >0.5 seconds
Run Mode
Green LED will ash 300ms on /
300ms off then red LED will be on
continuously*
Run Mode Insert a valid SIM card On Network Red LED will ash once every 3
seconds*
NOTE - Normal Operation: When the modem is rst switched on with a valid SIM card, the
red LED will be on continuously for about 10-15 seconds (this may vary considerably) whilst
the modem searches for the network. After this period if the modem correctly registers to
the network then the red LED will start to blink once every 3 seconds indicating everything is
running correctly and the modem is registered to the network.
If the red LED is on continuously for a long period of time (more than 5 minutes) then this
suggests there may be a problem with the SIM setup, the network signal or the antenna
connection.
The current modem state and function is shown below in table 4.
*LED default state is off. Need to congure AT#SLED command to enable software control of
LED ashing state.
AT#GPIO=1,0,2
AT#SLED=2
AT#SLEDSAV
**When the command SLED=2 has been set then no activity on the red LED indicates that the
modem is powered off.
Modem States
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