GSM Commander GC0321 User manual

User Manual for
GC0321, GC0641, GC1281
Applicable to software package Version 7.47 and up
Last Edited 03 October 2017
Before Attempting to connect or operate this product, please read these instructions in its entirety
This manual is intended to provide detailed technical specifications and explanations, to the basic
user as well as the more technically minded person. This manual is a live document, and will be
updated often with new information. Please insure that you have the latest version, by checking our
website at: https://www.gsmcommander.com.
hangelog:
DS 03 October 2017 Fixed specification table error
DS 09 June 2017 Update error codes and content
DS 09 May 2017 Update content (antenna info)
DS 20 April 2017 Update content / IMEI number
DS 04 April 2017 Fix errors and update content
SD 30 September 2016: Fixed errors and updated content
DS 25 August 2016: Updated contents table, fix errors and update content
HM 15 June 2016: Updated contents table with missing references,fixed spelling errors.
HM 14 June 2016: Amended operating parameters and description of settings.
HM 01 June 2016: Added new Airdrive SMS config command, variable population strings.
SJD 25 July 2014: Corrected General Status Message format.
SJD 05 July 2014: Updated General Status Message format.

TABLE OF CONTENTS
Features.......................................................................................................4
Specifications................................................................................................5
System requirements.......................................................................................5
Dimensions...................................................................................................6
Installation....................................................................................................7
Environment...............................................................................................7
Power Supply...............................................................................................7
USB Port....................................................................................................7
SIM Card....................................................................................................7
Antenna.....................................................................................................8
Software Installation.....................................................................................8
Mounting..................................................................................................11
Optically Isolated Digital Inputs.....................................................................11
Outputs....................................................................................................13
Temperature Sensor.....................................................................................14
Analog Input..............................................................................................15
Battery Input.............................................................................................16
Internal Battery..........................................................................................16
Expansion Unit...........................................................................................17
Dimensions of Expansion Unit..........................................................................18
Status LEDs...............................................................................................19
Testing the GSM Commander...........................................................................21
Commissioning Mode....................................................................................22
onfiguration VIA P ......................................................................................23
Basics......................................................................................................23
Software Tabs............................................................................................24
Numbers Tab List A and B...............................................................................24
Messages Tab.............................................................................................24
Behaviour Statements Tab..............................................................................24
Settings Tab...............................................................................................25
Status Tab.................................................................................................25
IO Names Tab.............................................................................................26
Analog Scaling Tab.......................................................................................26
Lock Setup................................................................................................26
onfiguration via SMS.....................................................................................27
Set Administrator number..............................................................................27
Clear Administrator number...........................................................................27
Check Administrator number...........................................................................28
Check Airtime............................................................................................28
Add a Number to the list...............................................................................28
Remove a Number from the list.......................................................................28
Enable/Disable statements.............................................................................28
Override GPRS Settings.................................................................................29
Reset GPRS................................................................................................29
IMEI Number..............................................................................................30
Switch SIM card..........................................................................................30
Reset GSM Commander.................................................................................30
IF-THEN Behaviour statements.........................................................................31
Supported IF Conditions................................................................................31
Supported THEN Actions................................................................................37
Multiple Actions to a Single IF ondition..............................................................39
Message Parameters.......................................................................................40
Variables.....................................................................................................41
Timed operations..........................................................................................41
Prepaid Airtime voucher loading.......................................................................42
Serial port...................................................................................................42
RS232 Configuration.....................................................................................43
Serial Functionality......................................................................................43
© Polygon Technologies. All rights reserved Page 2

Firmware Updates.........................................................................................47
Low power / Battery Operation.........................................................................48
4-20mA Analog Application Note.......................................................................49
Special Settings............................................................................................50
NITZ Timekeeping........................................................................................50
Set Variable via SMS.....................................................................................50
Jamming Detection......................................................................................50
Application Examples.....................................................................................51
Example 1: Periodic message..........................................................................51
Example 2: Monitor alarm..............................................................................51
Example 3: Control an appliance......................................................................52
Example 4: Gate / garage door opener..............................................................52
Example 6: Set an Output as a flag...................................................................52
Example 5: Contact to Contact relay.................................................................53
Troubleshooting............................................................................................54
GSM Commander setup software reports............................................................54
GSM Commander setup software reports “Hardware not detected”............................54
GSM Commander does not send any SMS messages / Error codes................................55
GSM Commander does not display the Airtime value..............................................56
GSM Commander does not respond to Voice Calls..................................................56
Guarantee...................................................................................................57
Disclaimer / Important Notice...........................................................................57
Important Notice...........................................................................................57
Manufacturer ontact details...........................................................................58
© Polygon Technologies. All rights reserved Page 3

1. FEATURES
* Only able to view the current status and history (on Historian package) via Airdrive ( http://www.airdrive.co.za).
** 3G capable GSM Commanders are capable of operating on 3G networks, where 2G is not available. Most countries can
operate on 2G without any issue.
© Polygon Technologies. All rights reserved Page 4
Model On-board Inputs On-board Outputs Max Number of Statements Max number of Messages Max Length of Messages GPRS Enabled 3G apable** Temp probes Supported Analog Inputs Battery / Power Monitor Extended Analogs DTMF Decoder SIM ard Slots
G 0321 2 2 12/12 32 256 64 127 YES* NO 2 1 YES NO NO Single
2 2 12/12 32 256 64 127 YES* YES 2 1 YES NO NO Single
G 0641 2 2 22/22 64 512 128 127 YES NO 2 1 YES YES YES Single
2 2 22/22 64 512 128 127 YES YES 2 1 YES YES NO Single
G 1281 2 2 32/32 128 512 128 127 YES NO 2 1 YES YES YES Dual
2 2 32/32 128 512 128 127 YES YES 2 1 YES YES NO Dual
Matrix Feature Descriptions
Model The code used to define between the various units functionality and capabilities
On-board Inputs The number of inputs provided on the base unit itself
On-board Outputs The number of outputs provided on the base unit itself
The maximum total number of messages that can be programmed into the unit
GPRS Enabled
The number of temperature probes the base unit can accept
Analog Inputs
Expandable Inputs / Outputs Max number of Phone Numbers
G 0321 3G
G 0641 3G
G 1281 3G
Expandable
Inputs/Outputs
The maximum total number of Inputs/Outputs that can be expanded to by fitting
expansion units
Max Number of
Statements
A measure of the amount of complexity that can be programmed into the unit.
Each statement is of the form IF <ABC happens> THEN <do something>, such as IF
Input 1 goes Active, THEN send “Generator Tripped” to “0831231234”
Max Number of
Phone Numbers
The maximum total number of phone numbers that can be programmed into the
unit
Max Number of
Messages
Max Number of
Statements
The maximum total number of behavior statements that can be programmed into
the unit
If yes, the unit is able to be registered onto the AirDrive Platform which can allow
it to log it's status, log it's events,have remote config and remote output control
via GPRS.
Temp Probes
Supported
The number of analog Inputs available. By default this is a 0 10V analog port. In
conjunction with a 470 Ohm resistor it can be used for a 4 20mA port as well. See
more information in the Analog port section.

2. SPE IFI ATIONS
Weight 200 grams
Dimensions 146.2 x 85,2 x 27 mm
Power Supply 12 24V DC via DC Jack
Power onsumption ~ 2.5W
urrent onsumption ~ 60mA at idle (no inputs or outputs active)
Operating Temperature 30°C to +60°C
Storage Temperature 30°C to +80°C
Digital Inputs
Opto isolated. Inputs draw 2 45mA, depending on
voltage. Can accept any DC signals of any type,
including:
➢Dry Contacts
➢Open Collector (NPN)
➢Closed Collector (PNP)
➢DC Voltage (3 20V)
Digital Outputs 2 x SPDT Relay Contact rating: 8 Amp DC (10 48V) or
4 Amp AC (110 – 250V). Expandable to maximum of 32*
Analog Inputs 1 x Analog input 8 bit resolution 0 10.8V / 4 20mA
IO onnector type Pluggable terminals
GSM-850/900MHz Output Power Class 4 +33dBm (2W)
GSM-850/900MHz Sensitivity 107dBm
GSM-1800/P S-1900 Output
Power Class 1 +30dBm (1W)
GSM-1800/P S-1900 Sensitivity 106dBm
* Model Dependent (See Feature Matrix in Section 2 )
3. SYSTEM REQUIREMENTS
The setup software requires a PC with the following specifications:
Operating system Windows 2000 / XP / Vista / 7 / 8 /10
omputer Architecture Pentium 2 or higher IBM compatible PC
Disk space 20MB
Ports 1 x free USB port
© Polygon Technologies. All rights reserved Page 5

4. DIMENSIONS
© Polygon Technologies. All rights reserved Page 6

5. INSTALLATION
5.1. Environment
Due to the make up of the GSM Commander and it's electronics, we STRONGLY advise that it not be
installed in close proximity to a variable speed drive or any other electrically noisy equipment. DO
NOT install the GSM Commander into a metal enclosure unless an antenna is mounted on the outside
of the enclosure.
5.2. Power Supply
The GSM Commander has a 2.1mm DC jack connector where a power supply must be connected. The
power supply should have the following specifications:
•Output Voltage: 14V nominal
•Output urrent: 0.5A
•Polarity:
A suitable power supply is supplied with the retail product.
Please Note: It is advised to use a 14V Switching Power Suppl if more than one Expansion Unit is
connected to the GSM Commander.
In industrial applications, it is advised that the GSM Commander be installed into its own
metal housing and be powered from a separate power supply with a DC Filter. As opposed to
sharing one with other equipment).
Please Note: While the GSM Commander has fairl rugged internal power suppl circuitr , no
special provision for lightning protection is made. If the GSM Commander is used in an area that is
prone to thunderstorms, it is advisable to use a commerciall available lightning suppressor (The
same applies to inputs or outputs that are connected to wires longer than 2 or 3 meters). The
guarantee does not cover damage resulting from lightning strikes! The GSM Commander can
operate reliabl from voltages in the range of 12 to 24V DC.
5.3. USB Port
The GSM Commander provides a USB port that connects to a PC using the supplied USB cable. This
allows the PC to configure the unit.
5.4. SIM ard
The GSM Commander accepts a standard GSM SIM card from any network. The SIM card may be
prepaid or on contract. If the SIM Card is purchased as part of a prepaid plan, ensure than the card
is loaded with sufficient airtime.
WARNING: DO NOT Insert or remove the SIM card while the GSM ommander is powered!!
Note that airtime will decrease with every SMS that is sent from the unit. The unit can
automatically detect if the airtime is running low. It is user's responsibility to make sure than the
airtime is topped up. See your network's documentation on how to purchase and load airtime.
The SIM card is fitted into the back of the unit, as indicated by the legend on the enclosure. The SIM
card will click into place and is removed simply by pressing against it. The card will pop out with a
“click” sound, ready to be completely removed.
© Polygon Technologies. All rights reserved Page 7

Before you install your SIM ard:
•Install the SIM card into a normal cellular phone
•Verify that there is no SIM PIN enabled (The phone must not ask for a PIN when switched on with
this SIM card inside). If the phone does request a PIN, you need to enter the correct pin so that
the phone can start, and then disable the SIM Card PIN. See your cellphone documentation on
how this can be done.
•Verify that you are able to send an SMS message.
The SIM card will now work with the GSM Commander.
Please Note: If ou are using a prepaid SIM card, be aware that if the SIM card has not produced a
billable event on the network for a long period of time (t picall 3 months), the card will be de-
activated b the network, and the SIM card then becomes useless. It is strongl recommended that
ou configure the GSM Commander to send ou an SMS ever now and then (once or twice a week)
so that our SIM card remains active on the network.
The GSM Commander can ONLY check the airtime of a PREPAID SIM card.
5.5. Antenna
The GSM Commander is supplied with a basic antenna operating in the correct frequency band for
your area / country. Connect the antenna to the GSM Commander securely. Verify, using a cellphone,
that there is sufficient signal at the proposed installation site. On a phone with a 4 or 5 bar signal
strength indicator, you should have at least 1 2 bars of signal.
If the signal is too weak, the GSM Commander may have trouble sending or receiving SMS messages.
Low signal can also affect the unit and might result in more data charges (using the GPRS gateway).
In these cases, try and find a better location, or order one of our special antennas.
If you are outside South Africa, you may require a different antenna.
The frequency bands are:
➢2G : 850 / 900 / 1800 / 1900MHz
➢3G : 800 / 850 / 900 / 1900 / 2100MHz
Your network will be able to tell you which frequency band(s) are in use. Contact your local
electronics supplier about antennas that operate in your area.
Feel free to contact Polygon Technologies with your request for a special antenna.
5.6. Software Installation
The latest software is supplied on a CD (where applicable) with the product and is also available to
download from our website for free at https://www.gsmcommander.com.
We do recommend downloading the latest version from our website.
The setup program (on the CD) will start automatically, or if the autorun feature is not enabled on
your PC, you may run the “setup.exe” executable file on the CD to start the setup process. The
software has been tested to work on Windows XP, Windows Vista, Win7, Win8 and Win10.
The setup process for Windows 7 has been documented here, but the process is similar in the other
versions of Windows.
© Polygon Technologies. All rights reserved Page 8

Screen 1:
Click
Screen 2:
It is recommended that you leave the
install path at the default location.
Click
Screen 3:
Click
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Screen 4:
Installation is in progress.
Screen 5:
Installation has been completed
successfull . Click
Screen 6:
Click
© Polygon Technologies. All rights reserved Page 10

5.7. Mounting
The GSM Commander is housed in a very durable ABS casing which has 4 protruding tabs, which
allows it to be mounted firmly to any surface by means of a screw. There is also a DIN rail mounting
kit available separately.
Please note: The GSM Commander is not water- or weatherproof. The GSM Commander must be
mounted indoors, or inside an appropriate IP65-rated weatherproof enclosure. The guarantee does
not cover damage resulting from water ingress! DO NOT mount the GSM Commander inside a steel
cabinet, unless ou also mount a separate antenna on the outside of the cabinet.
5.8. Optically - Isolated Digital Inputs
The GSM Commander itself provides 2 signal inputs. The number of inputs can be expanded by the
addition of Expansion modules, up to a maximum of 32 inputs*. Each of these inputs have 4
terminals associated with them:
Internal positive supply
Positive input
Negative input
Internal negative supply
To connect a switch or contact to an input, simply connect the switch between the - and -IN
terminals, and a wire between the + and + IN terminals. The reverse is just as suitable, i.e. that
you connect a wire between - and -IN and place the switch between + and +IN.
* Model Dependent (See Feature Matrix in Section 2)
© Polygon Technologies. All rights reserved Page 11

You may need an input to activate when power is supplied from some other unit. A good example
will be a burglar alarm that applies power to the wires going to the siren. In such a case, it will be a
simple matter of connecting the positive wire to the +IN input, and the negative wire to the –IN
input.
Please keep in mind that these inputs are designed for 3V to 20V operation. If you require to connect
a voltage above 20V to these terminals, you should connect a resistor in series with the input, as
shown below.
Input Voltage range Required Series resistor:
20V – 40V DC 1K ohm
The + and – terminals are connected to the input power supply of the GSM Commander.
If the power supply is 14V, the voltage at the + and – terminals will be slightly less at about 13.8V
(due to an internal series diode for reverse polarity protection).
© Polygon Technologies. All rights reserved Page 12

Here is a schematic of the input circuit used on the GSM Commander:
Drawing power for external hardware from the power terminals on the input:
One should not attempt to draw more than 50 100mA in total from the power terminals at the inputs
on the GSM Commander. For each expansion unit, the same applies.
5.9. Outputs
The GSM Commander itself provides 2 x 8A (DC) Relay outputs. The number of outputs can be
expanded by the addition of Expansion modules, up to a maximum of 32 outputs*. Each of these
inputs each have 3 terminals associated with them:.
Each of these inputs each have 3 terminals associated with them:
OM – Common Terminal
N/ – Normally Closed Terminal
N/O – Normally Open Terminal
When the output is off, the OM and N/ terminals will be internally connected to each other.
When the output is on, the OM and N/O terminals will be internally connected to each other.
Note that there are small LED indicators above the output terminals, that will show if the output is
ON or OFF (if the LED is on, then the output is also on).
* Model Dependent (See Feature Matrix in Section 2)
© Polygon Technologies. All rights reserved Page 13

In the picture below, the output is connected so that the lamp will light up when the output is on.
This output can be used to control devices and appliances, and is rated for 8A DC. It may be used to
control most types of electrical loads, excluding AC motors above 500W.
Here are some examples of things you CAN directly switch on and off using the outputs on the GSM
Commander:
•Gate motors and any other motor less than 500W
•Mains Lights (energy savers, incandescents, halogens) (maximum 750W)
Here are some examples of things that you can NOT directly switch on and off using the outputs on
the GSM Commander:
•Ovens, Heaters, kettles
•Pumps and motors above 500W
Please note: Keep in mind that if required, the above loads can easil be switched on and off using
an externall connected rela or contactor.
5.10. Temperature Sensor
One can connect 2 temperature sensors to the GSM Commander (at the expansion port via a
temperature interface module) to measure temperature and allow the GSM commander to perform
certain tasks if the temperature falls above or below a certain point. The sensor provides an
accuracy of 2°C.
The temperature sensor (with 2m, 4m or 8m lead) and temperature interface is available from
Polygon Technologies.
© Polygon Technologies. All rights reserved Page 14

5.11. Analog Input
The GSM Commander provides a single 0 10.8V analog input, which can be used to measure incoming
voltages from sensor devices or power sources (example: battery banks). Using an appropriate
resistor, one can also connect 4 20mA sources to the GSM Commander. (See application note under
section 18)
What makes this input so special, is that the GSM
Commander can interpret the analog value on your
behalf. It is perhaps the best to explain this at the
hand of a good example.
Suppose you have a water tank, with a level sensor
that is connected to the analog input of the GSM
Commander. The sensor is such, that when the tank is
empty, the voltage is 1.2V, and when the tank is full,
the voltage is 7.8V. The configuration software allows
you to request the current reading in a scaled format.
You would thus tell the software that 7.8V should correspond to 5000 litres, and 1.2V should
correspond to 0 litres, and leave the rest of the calculations to the GSM Commander.
You can now receive a message from the GSM Commander, detailing the actual contents of the tank
in litres, instead of just a raw value. (Which ou would otherwise have had to convert back to
“real” numbers ourself).
Please note: This feature assumes a linear relationship between the input voltage and the desired
output units. Thus, this will not work ver well for a c lindrical tank that is mounted on its side,
as the voltage from the level sensor is not linearl proportional to the actual contents of the tank.
The user is also able to define the message to precede, and the message to follow the analog value.
The output of the circuit above feeds to an Analog to Digital converter with a reference voltage of
0.98V, and a resolution of 8 bits. The full scale input voltage to the GSM Commander is therefore
10.8V. The range of the analog input can easily be increased by the addition of a resistor in series
with the analog input.
Below are some examples of resistor values, and the resultant input ranges.
RESISTOR MAX VOLTAGE RESISTOR MAX VOLTAGE
1K Ohm 0 – 11.8V 18K Ohm 0 – 28.4V
3.3K Ohm 0 14.0V 22K Ohm 0 – 32.3V
6.8K Ohm 0 – 17.4V 39K Ohm 0 – 49.0V
10K Ohm 0 – 20.6V 56K Ohm 0 – 65.6V
15K Ohm 0 – 25.5V 68K Ohm 0 – 77.4V
The configuration software assumes no series input resistor, when defining behaviour statements for
the analog input.
© Polygon Technologies. All rights reserved Page 15

The software shows both a voltage and a “counts” value when selecting trip points for the analog
input. The “counts” value is a variable from zero to 255 (8 bits). If you have connected a 3.3K Ohm
resistor in series, and you want to select a trip point at, say 12V, you will ignore the voltage shown
by the configuration software, and simply select the correct counts value of 214. ((12 / 14) x 250*)
Please note: The analog input counts never go above 250 (This is a known hardware limitation
problem) and the input is NOT isolated, and must be used with care.
5.12. Battery Input
The GSM Commander provides connections for an external rechargeable 12V battery. Under normal
circumstances, the GSM Commander will trickle charge the battery at a current of about 60mA. In
the case of a power failure, the GSM Commander then starts drawing power from the battery to
continue operating.
In the case of a power failure, the GSM Commander can continue operating from the external
battery. The unit can be configured to perform certain tasks (like sending a warning SMS) if the
battery voltage falls below a certain point, and can also perform tasks in the case of a power
failure. (Like sending an SMS and switching on emergency lighting)
In cases where the GSM Commander is used in conjunction with a large system with its own battery
(such as UPS systems), the battery terminals of the GSM Commander can be safely connected to the
large (12V) battery, and the GSM Commander can then monitor the battery voltage for you (only
while power is NOT supplied to the power input connector).
Also, in cases where the user may want to connect other hardware directly to the battery, be aware
that this will probably drain the battery, since the charging current from the GSM Commander is so
low. Other hardware should rather be connected to the power terminals provided at the inputs
(See sec 5.8 for more information on this).
Internal to the GSM Commander, the Battery terminal is wired with a 47ohm resistor between the +
Batt terminal and the positive power supplied to the GSM Commander. There is a diode in parallel
with this resistor (cathode facing to the battery) to allow the GSM Commander to draw power from
the battery under power fail conditions.
A resettable fuse has now also been added to give the Battery terminal added protection against
voltage spikes and short circuits.
Suitable batteries are available from Polygon Technologies.
5.13. Internal Battery
GSM Commanders with a "+" at the end of their part numbers (GCXXXX+), are equipped with an
internal 3.7V li ion battery. This battery can keep the unit going even when the mains power is
turned off.
Please Note: Because of the low batter voltage, the GSM Commander will not be full functional
when running from the internal batter . Specificall , ALL INPUTS and OUTPUTS will be disabled.
The GSM Commander will still be able send/receive SMSes and voice calls. This is very handy for
applications where the only requirement of a battery is for power failure notifications. Mounting an
external lead acid battery can be troublesome. This option will effectively solve the problem.
Another area where this feature is important, is in security applications. Sometimes criminals would
break open the enclosure and cut all the wires in an effort to prevent an SMS or call from being
made. The internal battery will be impossible to turn off, and thus they cannot prevent the
transmission.
© Polygon Technologies. All rights reserved Page 16

5.13.1. Resetting the GSM Commander (GCXXXX+)
The GSM Commander will leave the factory in a constant reset state.
The moment an external power supply is connected to the GSM Commander, the internal battery will
switch on.
Now that it is almost impossible to turn the GSM Commander off, it may be a problem to reset it. To
reset the GSM Commander, the "Turn Off " dongle that is supplied with the unit must be inserted into
the GSM Commander's RS232 port. This will place the GSM Commander in in a constant reset state.
Removing it will return the GSM Commander to normal functionality.
5.13.2. Pitfalls
It is NOT recommended to remove or insert the SIM card while the GSM Commander is powered up,
thus we advise that the GSM Commander should first be in the reset state (See sec 5.4) before
removing or inserting the SIM card.
5.14. Expansion Unit
The GSM Commander supports comprehensive expansion by means of the GSM Commander Expansion
unit, which provides an additional 5 inputs and 5 outputs similar to the ones found on the GSM
Commander itself. A total of 6 Expansion units may be daisy chained to provide a maximum of 30
outputs and 30 inputs* in addition to those on the GSM Commander itself.
14V D Jack and Battery Input on Expansion Unit
Each Expansion unit has both a 14V DC jack and battery input, so that it could also be powered by a
separate power supply and battery. Applying power to the Expansion unit either through the DC jack
or battery terminal is optional. The Expansion unit can draw power via the ribbon cable, but under
certain conditions it is better to supply a separate 14V source and battery to the expansion unit.
These conditions are:
➢When the ribbon cable run becomes very long (>5m)
➢If you are going to connect more than one expansion unit
➢If you expect to draw power from the input on the Expansion unit
➢If you expect most of the inputs and outputs on the expansion to likely be active at once
© Polygon Technologies. All rights reserved Page 17

The Expansion unit will automatically detect if power is applied at either of the it's 14V inputs (DC
jack and battery) and thus stop drawing power via the ribbon cable. So to ensure that the Expansion
unit functions properly in mains power failure conditions, it is advised that you connect a 12V
battery to it's battery terminals together with it's main 14V power supply.
Interface Ribbon cable
Supplied with each Expansion unit is a short (40cm) ribbon cable for interface purposes, but this
ribbon can also be very long. We have tested up to 10m, but we generally recommend a maximum
cable run of 7 8m. Please contact us if you need a longer ribbon cable.
The ribbon cable connectors are mounted such that pin 1 on the one end connects to pin 10 on the
other, Pin 2 connects to pin 9 etc.
It is important to connect the Expansion port on the GSM Commander to the IN connection on the
expansion unit. An additional Expansion unit must be connected with its IN connection to the OUT
connection of the “upstream” Expansion unit.
* Model Dependent (See Feature Matrix in Section 2)
5.15. Dimensions of Expansion Unit
© Polygon Technologies. All rights reserved Page 18

5.16. Status LEDs
The GSM Commander has 2 LEDs to show the current status of the GSM Commander. The red LED,
labelled “GSM”, shows the status of the internal GSM cellular engine, while the green LED, labelled
“STATUS”, shows the status of the GSM Commander as a whole.
The following table shows how one can determine the current status:
GREEN LED (STATUS)
➢ Solid On
: Busy Booting
➢ on for 500ms, off for 500ms (slow flash)
: All OK
➢ on for 200ms, off for 200ms (fast flash)
: Airtime running low
➢ on for 10ms, off for 500ms (2 short flashes per second)
: Signal is low
➢ on for 50ms, off for 50ms (very fast flash)
: Problem with GSM engine
➢ on for 100ms, off for 500ms, on for 100ms, off for 500ms,
on for 500ms, off for 500ms (2 short and 1 long flash)
: Setup is corrupt
➢ on for 50ms, off for 100ms, on for 50ms, off for 100ms,
on for 50ms, off for 1000ms (3 short flashes)
: Supply voltage below 9,5V
RED LED (GSM)
Applicable to units with SN:xxxxxx 3 xxxx:
➢ OFF : GSM engine OFF
➢ on for 600ms, off for 600ms
: GSM engine searching for network
➢ on for 75ms, off for 3000ms (1 short flash every 3 seconds)
: GSM engine registered OK
➢ Solid On
: GSM busy with a voice call
© Polygon Technologies. All rights reserved Page 19

Applicable to units with SN:xxxxxx 4 xxxx:
➢ OFF : GSM engine OFF
➢ on for 64ms, off for 800ms
: GSM engine searching for network
➢ on for 64ms, off for 2000ms (1 short flash every 2 seconds)
: GSM engine registered OK
Applicable to units with SN:xxxxxx 5 xxxx:
➢ OFF : GSM engine OFF
➢ on for 200ms, off for 1800ms
: GSM engine searching for network
➢ on for 1800ms, off for 200ms
: GSM engine registered OK
➢ Solid On
: GSM busy with a voice call
© Polygon Technologies. All rights reserved Page 20