SIRETTA ZULU Series Quick user guide

inspired wireless technology
ZULU Series
GPRS/UMTS/LTE ARM Cortex M4 Modem
Range with USB Serial Port Interface
Hardware Reference Manual
Rev 3.7

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
inspired wireless technology
2
ZULU Series
GPRS/UMTS/LTE ARM Cortex M4 Modem Range
with USB Serial Port Interface
Table of Contents
Page
Introduction 3
About Siretta 4
General Description 5
Specications 5
AT Commands 7
ZULU Interface 8
System Diagram 10
System Overview 11
Modes of Operation 13
Ordering Information 14
Dimensions 15
DIN Rail Mount 16
Mounting the ZULU 16
Removing the ZULU 16
ZULU Series Images 17
ZULU LED Indicators 18
User Programmable LED Status Control 19
Modem States 20
Interfaces 21
RS232 Serial Port Interface 21
USB Serial Port Interface 23
GPIO 36-Way Connector 24
Digital Functions 30
Digital Output 30
Digital Input 31
SIM Socket 32
SIM Requirements 32
Antenna Connectors 33
GSM/UMTS Antenna Connector 34
GPS Antenna Connector (Optional) 35
GPS 36
ZULU-G-GPRS Modem 36
ZULU-G-UMTS Modem 36
GPS Performance (ZULU-G Variants) 36
Internal Connections 38
Onboard LEDs 39
Relay 40
Power 41
RJ12 Power Connector 41
Power Supply Requirements 42
Current Consumption 43
Switching the Modem ON/OFF 45
Embedded Software Support 47
Telit AppZone 47
Telit Easy Script in Python 48
Embedded C/C++ Development for ARM
Cortex M4
49
Siretta Recommends 53
Installation 56
Considerations for Installations
Incorporating the ZULU
56
Power Supply Installation 57
Securing the Modem 57
Safety and Product Care 58
General Precautions 58
SIM Card Precautions 58
Antenna Precautions 59
Exposure to RF Energy 59
Safety Recommendations 61
Conformity Assessment 62
Disclaimer 63
Denitions 64

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
inspired wireless technology
3
ZULU Series
GPRS/UMTS/LTE ARM Cortex M4 Modem Range
with USB Serial Port Interface
Introduction
This document is intended to provide guidance when adding a modem from the
ZULU Series to your system.
The ZULU series of GPRS/UMTS/LTE M2M ARM microprocessor modems is an
advanced range of USB modems developed for easy application development.
The ZULU modem range is based on the Telit xE910 GPRS/UMTS/LTE module
series and is available with or without GPS. The additional ARM Cortex M4 32bit
processor manages the Telit module and is intended for the user to program custom
applications.
This document discusses the device states and modes of operation in addition to the
electrical characteristics of the device interfaces.

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
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4
ZULU Series
GPRS/UMTS/LTE ARM Cortex M4 Modem Range
with USB Serial Port Interface
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

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]
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5
ZULU Series
GPRS/UMTS/LTE ARM Cortex M4 Modem Range
with USB Serial Port Interface
Specications
ZULU-GPRS ZULU-UMTS
2G frequency band: 850, 900, 1800, 1900MHz 850, 900, 1800, 1900MHz (EU Version)
3G frequency band: - 850, 900, 1700, 1900, 2100MHz
GPS support (optional): GPS, Glonass, Galileo, QZSS GPS
Dimensions: 134mm x 74mm x 33mm 134mm x 74mm x 33mm
Weight: 125g 125g
Supply voltage: 5 - 42V 5 - 42V
Operating temperature range: -30 to +80°C -30 to +80 °C
GSM antenna connector: SMA Female SMA Female
GPS antenna connector (optional): SMA Female SMA Female
The ZULU range of GPRS modems are amongst the most advanced and capable
modems available today. The ZULU series offers a range of options including USB
and RS232 serial port communication. With its powerful built in ARM Cortex M4 32bit
processor you are able to develop your own applications directly on the modem to
implement the functionality you require.
General Description
Table 1. Specications of ZULU modem

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Berkshire RG7 1PW
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6
ZULU Series
GPRS/UMTS/LTE ARM Cortex M4 Modem Range
with USB Serial Port Interface
Table 2. Modem data transfer speeds
Model Region Coverage Max Download Max Upload
ZULU-V2-N-GPRS Global 236.8Kbps 59.2Kbps
ZULU-V2-G-GPRS Global 236.8Kbps 59.2Kbps
ZULU-V2-N-UMTS Global 21Mbps 5.76Mbps
ZULU-V2-G-UMTS Global 21Mbps 5.76Mbps
ZULU-V2-N-UMTS (EU) (Europe) 7.2Mbps 5.76Mbps
ZULU-V2-G-UMTS (EU) (Europe) 7.2Mbps 5.76Mbps
ZULU-V2-N-LTE (EU) (Europe) 100Mbps 50Mbps
ZULU-V2-G-LTE (EU) (Europe) 100Mbps 50Mbps
NOTE - For part numbering and ordering information see page 14

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
inspired wireless technology
7
ZULU Series
GPRS/UMTS/LTE ARM Cortex M4 Modem Range
with USB Serial Port Interface
*For GPRS modems refer to the GPRS AT Command Manual, for UMTS modems refer to the
UMTS AT Command Manual.
AT Commands
The ZULU 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 modem 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 ZULU wireless modems.

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
inspired wireless technology
8
ZULU Series
GPRS/UMTS/LTE ARM Cortex M4 Modem Range
with USB Serial Port Interface
ZULU Interface
Standard Hardware Interfaces
As standard, the ZULU series modem comes with the following interfaces:
»1 x RS232 serial port interface for direct serial connection to microprocessor / module
»1 x USB serial port interface
»1 x RJ12 power connection with 2 power lines and 4 input interfaces (5 - 42V)
»1 x SMA female GSM antenna connector
»1 x SIM card reader (push-push)
»1 x internal LED charge status indicator (Green)
»9 x internal LED GPIO status indicators (Orange)
»3 x external LED status indicators (Red, Blue, Green)
»128Mbit internal SPI ash
»3-axis high sensitivity accelerometer to detect motion, rotation and freefall
»High power relay with independent microprocessor control (600mA 60V DC normally open)
»Intelligent Li-Ion battery charge management controller with battery protection
»Standard 36-Way Connector Interfaces
○1 x wired (36-way) power supply
○1 x wired (36-way) Vcc_IO general purpose output voltage control line
○1 x wired (36-way) hardware boot loader control signal
○1 x wired (36-way) RS232 serial command port
○1 x wired (36-way) RS232 debug port for direct serial connection to module
○1 x wired (36-way) Ignition interface
○1 x wired (36-way) CAN interface
○1 x wired (36-way) I2C interface
○1 x wired (36-way) 1-wire interface
○1 x wired (36-way) 3.3V power supply output interface
○1 x wired (36-way) relay interface
○2 x wired (36-way) 12-bit DAC interfaces (0-42V)
○2 x wired (36-way) 12-bit ADC interfaces (42V tolerant)
○5 x wired (36-way) general purpose input interfaces
○4 x wired (36-way) general purpose output interfaces

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
inspired wireless technology
9
ZULU Series
GPRS/UMTS/LTE ARM Cortex M4 Modem Range
with USB Serial Port Interface
Optional Software Packages
The ZULU series modems have the following optional software packages available:
»V-LinkUSB Software
Wireless cable replacement using USB over GPRS/UMTS
»V-Link232 Software
Wireless cable replacement using RS232 serial cable over GPRS/UMTS
Optional Coverage
The ZULU series modems have the following coverage options available:
»(EU) European
»(NA) North America
Optional Modem Features*
Optional Hardware
The ZULU series modems have the following optional hardware features:
»High performance SirfStarIV GPS engine (Options available for GPS/Glonass/Galileo/QZSS)
»2000mAh Li-Ion battery
Optional Technologies
The ZULU series modems have the following optional technologies available:
»GPRS (2G)
»UMTS (3G)
»LTE (4G)
*To add optional features on your modem, see ‘Ordering Information’ on page 14

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
inspired wireless technology
10
ZULU Series
GPRS/UMTS/LTE ARM Cortex M4 Modem Range
with USB Serial Port Interface
System Diagram
ARM Cortex M4
32bit Processor
(STM32F417VGT6)
GPIO
GSM
5 - 42V
PSU
Power Input
Battery
(2000mAh)
SIM
RS232 Serial Port Interface
Accelerometer
X
Visual Indicators
USB Serial Port Interface
Microprocessor Subsection Power Supply Subsection
Communication Subsection
USB
RS232
128Mbit
Debug Serial Port
RS232 Serial Port
9 x GPIO (5 x I, 4 x O)
36-way Connector Interfaces
Power Input
Ignition Line
Relay (600mA)
2 x ADC
2 x DAC
1 x CAN
1 x 1-Wire
1 x I2C
Telit xE910 Module
GPS
Figure 1. ZULU system diagram
The ZULU Series is an intelligent range of ARM Cortex M4 32bit processor modems
offering USB V2 for full 12Mbit serial communication. The system diagram below
gives a visual representation of the ZULU interfaces available to the user and shows
the various subsections which make up the complete ZULU modem.

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
inspired wireless technology
11
ZULU Series
GPRS/UMTS/LTE ARM Cortex M4 Modem Range
with USB Serial Port Interface
System Overview
ARM Cortex M4 32bit Processor
The ZULU core is built around the ARM Cortex M4 32bit processor which
has been congured to offer the following features as standard:
»32bit CPU running at 168MHz (210DMIPS)
»Onboard 16Mbit ash storage
»192 Kbyte SRAM volatile memory
»Memory controller supporting: Compact Flash, Flash, SRAM, PSRAM, NOR, NAND memory
»1 x UART H/W port (supporting TX, RX, CTS, RTS) for connection to the outside world
»1 x RS232-SEL controller input to interface directly to the microprocessor or module from the
outside world
»1 x UART-Debug port (supporting TX, RX) for connection to the module
»1 x USB OTG port for connection to the outside world
»1 x USB host controller for high speed internal connection to the modem
»1 x high speed CAN interface
»1 x I2C bus
»1 x 1-wire bus
»5 x high speed GPI (0 - 42V tolerant)
»1 x ignition line (0 - 42V tolerant)
»4 x high speed GPO (0 - 42V driven output hardware controlled with Vcc_IO pin)
»2 x 12bit A/D converters (0 - 42V tolerant)
»2 x 12bit D/A converters
»Hardware cryptographic accelerator
»RTC and hardware watchdog timer
»Low power utilising sleep, stop and standby modes
»Internal JTAG interface for system debug and programming
This ZULU can be used in a number of applications, some examples are shown
below:
»V-Link232 Software (Wireless cable replacement using RS232 serial cable over
GPRS/3G)
»GPIO Monitor (Monitor/Set and report on GPIO status)
»Standard RS232 modem attached to equipment (Modem)
»V-LinkUSB Software (Wireless cable replacement using USB serial cable over
GPRS/3G)

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]
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12
ZULU Series
GPRS/UMTS/LTE ARM Cortex M4 Modem Range
with USB Serial Port Interface
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 or USB connectivity over 2.5G/3G. Internet
connectivity can be retrotted to end equipment without changing the software of
conguration.
»Used in countries where broadband and WiFi is a less common method to connect to
the internet or where services are unavailable. The ZULU modem can overcome this
restriction by providing a mobile internet solution over the GPRS/3G network.
Embedded Systems
The V-Link software can be used with an embedded system where automated end to end
communication is required.
If the embedded system has limited intelligence or has limited conguration capability the
Siretta V-Link software can be used to connect the system to a central server easily and
simply.
The V-Link software can also be used to control and manage the remote modem so that the
connection from the embedded system to the central server/control head ofce is seamless
and reliable.
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

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
inspired wireless technology
13
ZULU Series
GPRS/UMTS/LTE ARM Cortex M4 Modem Range
with USB Serial Port Interface
USB Interface
This is a USB standard Communication Device Class (CDC) device. This is provided
with a driving for the OS, i.e. a standard OS supported driver.
V-Link Software
Embedded systems can use the RS232 serial port to connect to a remote device to
a central server. The serial conguration supports most congurations and can be
changed either via the USB interface, or via SMS commands.
Modes of Operation

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]
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14
ZULU Series
GPRS/UMTS/LTE ARM Cortex M4 Modem Range
with USB Serial Port Interface
Part Numbering
Modem Identier
ZULU = Intelligent Siretta Modem with ARM Cortex M4
32bit Processor, USB and RS232 Serial Port Interfaces
Module Type
N = Without GPS
G = With GPS
Product Module Version
GPRS = GPRS Technology
UMTS = UMTS Technology
LTE = LTE Technology
European Coverage Options
(EU) = European Coverage of GSM and UMTS Only
(NA) = North American Coverage of GSM and UMTS Only
Software Package Options
(V-LinkUSB) = V-LinkUSB Software
(V-Link232) = V-Link232 Software
*This is an additional option and doesn’t have to be selected
Part Numbering Example
»ZULU-N-GPRS = GPRS Modem with ARM Cortex M4 Processor, USB and RS232 Serial Port Interfaces,
without GPS
»ZULU-GB-UMTS (EU) (V-Link232) = EU Coverage UMTS and GPS Modem with ARM Cortex M4 32bit
Processor, USB and RS232 Serial Port Interfaces, Battery and V-Link232 Software
Modem Options*
B = With Battery
ZULU X X XXXX (XX) (XXXX)
- -

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]
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15
ZULU Series
GPRS/UMTS/LTE ARM Cortex M4 Modem Range
with USB Serial Port Interface
Dimensions
All dimensions are shown in mm.
FRONT ELEVATION
134.26
74.26
PLAN
SIDE ELEVATION
33
SIDE ELEVATION
BOTTOM ELEVATION
ISOMETRIC
1:2 @ 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
Concept
DRAWING TITLE STATUS PROJECT INFO
UK
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 Millimeters UNLESS OTHERWISE STATED
SA10921
6.0
Enclosure
µPro
Assembly 1
Sequoia Technology Group
20/02/2013 B.Hulman
DRAWING: X:\Sequoia Design\Sequoia\SEQ910\Enclosure\ SEQ910 Enclosure
MODEL: X:\Sequoia Design\Sequoia\SEQ910\Enclosure\ SEQ910 Enclosure
DESIGNER
25/04/2013
ISSUE DATE
DO NOT SCALE OFF DRAWING EMAIL [email protected] FOR DXFS OR OTHER SCALABLE FILES.
Page No: 01 /05
GENERAL NOTES:
PART NUMBER
REV
SCALE
6.0_Altered s10923_25/04/13_BH 5.0_Altered to mold feasibility report_15/04/13_BH 4.0_Alterations to S10922_08/04/13_BH 3.0_Alterations to S10923_04/04/13_BH 2.0_Changes to all parts_03/04/13_BH 1.0_Preliminary issue_01/03/13_BH
Figure 2. ZULU front view Figure 3. ZULU underside view
35
5.1
5.1
52.7 36.20
LEFT SIDE
74.26
13.6 14
BOTTOM ELEVATION
134.26
33
47 39.9
RIGHT SIDE
50
74.26
120
134.26
FRONT ELEVATION
33
74.26
19.52 25
PLAN
1:2 @ 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
Concept
DRAWING TITLE
STATUS
PROJECT INFO
UK
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 Millimeters UNLESS OTHERWISE
STATED
SA10921
6.0
Enclosure
µPro
Sheet1
Sequoia Technology Group
20/02/2013
B.Hulman
DRAWING: X:\Sequoia Design\Sequoia\SEQ910\Enclosure\ SEQ910 Enclosure - Outer Dimensions
MODEL: X:\Sequoia Design\Sequoia\SEQ910\Enclosure\ SEQ910 Enclosure
DESIGNER
07/11/2013
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
6.0_Altered s10923_25/04/13_BH
5.0_Altered to mold feasibility
report_15/04/13_BH 4.0_Alterations to
S10922_08/04/13_BH 3.0_Alterations to
S10923_04/04/13_BH 2.0_Changes to
all parts_03/04/13_BH 1.0_Preliminary
issue_01/03/13_BH
35
5.1
5.1
52.7 36.20
LEFT SIDE
74.26
13.6 14
BOTTOM ELEVATION
134.26
33
47 39.9
RIGHT SIDE
50
74.26
120
134.26
FRONT ELEVATION
33
74.26
19.52 25
PLAN
1:2 @ 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
Concept
DRAWING TITLE
STATUS
PROJECT INFO
UK
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 Millimeters UNLESS OTHERWISE
STATED
SA10921
6.0
Enclosure
µPro
Sheet1
Sequoia Technology Group
20/02/2013
B.Hulman
DRAWING: X:\Sequoia Design\Sequoia\SEQ910\Enclosure\ SEQ910 Enclosure - Outer Dimensions
MODEL: X:\Sequoia Design\Sequoia\SEQ910\Enclosure\ SEQ910 Enclosure
DESIGNER
07/11/2013
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
6.0_Altered s10923_25/04/13_BH
5.0_Altered to mold feasibility
report_15/04/13_BH 4.0_Alterations to
S10922_08/04/13_BH 3.0_Alterations to
S10923_04/04/13_BH 2.0_Changes to
all parts_03/04/13_BH 1.0_Preliminary
issue_01/03/13_BH
Figure 4. ZULU antennas and LED view
Figure 5. ZULU 36-way connector view

A member of the Olancha Group Ltd
Registered in England No. 08405712
VAT Registration No. GB163 04 0349
Siretta Ltd
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Spencers Wood
Reading
Berkshire RG7 1PW
sales
fax
email
web
[phone]
[phone]
[email protected]
www.siretta.co.uk
inspired wireless technology
16
ZULU Series
GPRS/UMTS/LTE ARM Cortex M4 Modem Range
with USB Serial Port Interface
DIN Rail Mount
Figure 6. Mounting ZULU to DIN rail Figure 7. Removing ZULU from DIN rail
The ZULU has an integrated DIN rail mount housing which allows the unit to
connect on to the standard rail widely used for mounting industrial control
equipment inside equipment racks. This has been adopted as a European (EN)
and International (ISO) Standard.
Hook the bottom modem DIN rail clip onto the
bottom of the DIN rail
Push modem 45° until the top DIN rail clip locks
onto the top of DIN rail
1
2
1
2
Mounting the ZULU Removing the ZULU
Slide DIN rail clip upwards
Pull modem 45° until the top DIN rail clip unlocks
from the top of DIN rail
Slide modem down, until bottom DIN rail clip
unlocks from the bottom of the DIN rail
1
2
1
2
3
3

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VAT Registration No. GB163 04 0349
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inspired wireless technology
17
ZULU Series
GPRS/UMTS/LTE ARM Cortex M4 Modem Range
with USB Serial Port Interface
ZULU Series Images
Figure 8. 3D view of the ZULU-G variant Figure 9. Front view of the ZULU-G variant
Figure 10. Underside view of the ZULU modem

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
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inspired wireless technology
18
ZULU Series
GPRS/UMTS/LTE ARM Cortex M4 Modem Range
with USB Serial Port Interface
ZULU LED Indicators
There are 3 LED outputs on the ZULU 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 ARM Cortex M4 32bit processor (default setting to show visual
indication of network registration status. Please see AT#SLED command.)*
Green Congurable via ARM Cortex M4 32bit processor**
Blue Congurable via ARM Cortex M4 32bit processor**
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 ‘User Programmable LED Status Control’ section on page 19

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Siretta Ltd
Basingstoke Road
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Berkshire RG7 1PW
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inspired wireless technology
19
ZULU Series
GPRS/UMTS/LTE ARM Cortex M4 Modem Range
with USB Serial Port Interface
The green and blue LED’s can be controlled in two different ways:
1) The ARM cortex M4 directly controls the LED indicators and can control the
LED’s independently to the modem. This allows the application running in the
ARM processor to indicate the modem status to the user.
2) Alternatively the GPIO lines on the modem can be congured to control the LED
indicators directly. This allows the module 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 example below the green LED is congured in the ARM Cortex M4 to directly
connect to GPIO2 on the module and the blue LED is congured in the ARM Cortex
M4 to directly connect to GPIO3 on the module. (This is a special case which
has been programmed in software running on the ARM Cortex M4 processor to
demonstrate the example. This conguration can be changed as required and is
purely to demonstrate the capability of the two devices working together.)
The AT commands are entered on the module via the serial port to control the LED’s
directly. (This could also be achieved by executing the commands in Python script
running on the module.)
AT#GPIO=2,1,1 (switch general purpose output 1 on, PIN7, 36-way connector -
connected to green LED)
AT#GPIO=2,0,1 (switch general purpose output 1 off, PIN7, 36-way connector -
connected to green LED)
AT#GPIO=3,1,1 (switch general purpose output 2 on, PIN9, 36-way connector -
connected to blue LED)
AT#GPIO=3,0,1 (switch general purpose output 2 off, PIN9, 36-way connector -
connected to blue LED)
User Programmable LED Status Control

A member of the Olancha Group Ltd
Registered in England No. 08405712
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inspired wireless technology
20
ZULU Series
GPRS/UMTS/LTE ARM Cortex M4 Modem Range
with USB Serial Port Interface
Table 4. Modem states (assume AT#SLED=2*)
Current Modem State Input Next state Indication of new state
Power Off Connect power Run Mode 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 on
RJ12 Power Connector) to
0.5V - 42V for >0.5 seconds
Power off No activity on any LED**
Run Mode
Hold PWROFF_IN (Pin 3 on
RJ12 Power Connector) to
0.5V - 42V for >0.5 seconds
Power off No activity on any LED**
Power Off
Hold PWRON_IN (Pin 4 on
RJ12 Power Connector) to
0.5V - 42V for >0.5 seconds
Run Mode Red LED will be on*
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. You will 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