CENTURION SYSTEMS G-SWITCH-22 Operating instructions

Centurion Systems (Pty) Ltd
www.CentSys.com
G-SWITCH-22 2G GSM Module
Programming Guide
TM

1. Programming the G-SWITCH-22
Special Functionality
The G-SWITCH-22 offers various advanced and useful features which can
be easily set up via SMS or using the G-WEB online user interface.
These features are intended to enhance the Module’s capabilities and offer
the user more flexibility in applying the Module as a full monitoring and
control solution.
Below appears a list of the G-SWITCH’s advanced features as well as a
definition of each.
&Sticky Latches: The Module’s Outputs can be configured to
‘remember’ their state between power cycles.
For instance, if Output 2 was active, i.e. the relay
in an energised state, and the power is removed,
when power is reapplied Output 2 will return to the
activated state. This functionality is referred to as a
‘sticky latch’ and can be enabled or disabled.
Sticky latches don’t apply to pulsed Outputs and
are enabled by default
&Filter Time: Filter Time determines how long an Input event
(rising or falling edge) must be present before it is
recognised, i.e. an SMS is sent. The time is set in
increments of one second and the default is 0
&Blanking Time: Blanking Time determines how long the unit will
wait between events before it will recognise the
next event
&Event Count: This refers to how many Input events must occur
before it is recognised and an SMS notification is
sent to users
&All Pass Mode: When enabled, this useful mode allows any number
that gives the Module a Missed Call to activate the
Outputs, irrespective of whether they are learned
into memory. A typical application would be an
event such as a wedding where many guests need
to be given temporary access. Instead of manually
learning in a 100 guests and then having to delete
them again after the occasion, the administrator
can simply enable All Pass Mode and disable it
again afterwards
&Permitted The G-SWITCH-22 allows for time-periods to be
Access Mode specified during which a specific user's phone
(Recurring number will be valid and will be allowed to activate
Weekly) the unit's outputs via Missed Call or SMS.
Any activation from the user initiated outside of the
specified time-period will be ignored.
For instance, a user can be granted access between
8:00 and 17:00, Monday to Friday and his access
barred from activating the outputs after hours and
during weekends
&Permitted In this mode, an administrator can specify two
Access Mode time-based parameters between which a number
(Once off) will be valid. This is ideal for guesthouse and Bed
and Breakfast owners, as it enables them to set
specific arrival and departure dates and times and
allow access to guests based on these
time-dependent limits. This feature and only be
activated via G-Web
Multi-user Capability (1200 phone numbers)
It is important to note that the memory of the G-SWITCH-22 2G GSM
Module is limited to 1200 authorised phone numbers. In other words, a
maximum of 1200 phone numbers can be registered on the system at any
one time. Each phone number can be configured uniquely with respect to
Inputs and Outputs, as well as activation and notification messages. Each
phone number can also be assigned a limited number of uses for each
Output.
When the memory limit is reached, trying to add new phone numbers will
not overwrite or affect the existing numbers stored into the system, it will
just not be possible to add the additional numbers.
3. Command Structure
Programming commands are sent to the Module using a standard text
message (SMS).
The command structure must always take the following form:
p.xxxx.command1.parameter1.parameter2 command2.
parameter1.parameter2, etc.
2. In a Hurry?
To simply add a phone number to the Module to trigger Output 1, with
the default pulse time activated through a Missed Call, send the following
SMS to the Module: p.xxxx.ap.yyyyyyyyyy, where xxxx is the system
password (default is 1234¹), and yyyyyyyyyy is the phone number you
wish to add.
1. For your own security, it is recommended that the default password
be changed and that the SIM PIN code protection is enabled once
the unit has been configured.
(see CO. ‘Configuring the Module’)
Record system password here
Record new SIM PIN here
Ensure that a record of your system password is kept in a safe place.
Ensure that a record of the new SIM PIN number is kept in a safe place.

Load airtime (L)
Query airtime (Q)
Sub-parameters
Airtime voucher number
(Airtime)
Loads or queries
airtime
AT
(Query Phone)
Query phone
settings
Phone number (up to 19 digits)
QP
OU1PU Sets Output 1 as pulsed
OU1LA Sets Output 1 as latched
OU1PT Sets Output 1 pulse time in
milliseconds
OU2PU Sets Output 2 as pulsed
OU2LA Sets Output 2 as latched
OU2PT Sets Output 2 pulse time in
milliseconds
SS Requests Signal strength
CS Changes SIM card PIN number
EP Enables SIM card PIN checking
DP Disables SIM card PIN checking
SP Sets SIM PIN in memory only
QF Queries the Firmware version
QS Queries the Module settings
NP New system password
BE Backs up EEPROM
RE Restores EEPROM
IO Input/Output mappings
QB Queries the battery voltage
CL Clears the transaction logs
REBOOT Reboots the Module
SLE Enables sticky latches
SLD Disables sticky latches
RSL Resets sticky latches
STR Sets the string number and
associated text
ATE Enables the automatic hourly
airtime query
ATD Disables the automatic hourly
airtime query
INxR Makes the selected Input rising
edge active
INxF Makes the selected Input falling
edge active
INxB Makes both of the selected Input
edges active
INxBT Sets the selected Input Blanking
Time
(Configuration)
Configure Inputs,
Outputs and
system settings
OU1 Activates Output 1
DOU1 Deletes Output 1
OU2 Activates Output 2
DOU2 Deletes Output 2
IN1 Activates Input 1
DIN1 Deletes Input 1
IN2 Activates Input 2
DIN2 Deletes Input 2
DIN1S Deletes Input 1 string
DIN2S Deletes Input 2 string
DOU1S Deletes Output 1 string
DOU2S Deletes Output 2 string
(Edit Phone)
Edit a phone
EP
Phone number (up to 19 digits)
(Delete Phone)
Delete a phone
number from the
system
DP
All commands must start with ‘p.xxxx’, where xxxx is a user-
defined four-digit password. The default password is 1234.
For security purposes, this should be changed on commissioning.
&Each command and parameter must be separated by
a period (.)
&Commands can be concatenated (linked), and must be
separated by a space ( )
&The maximum message length is limited to 160 characters
&Commands are not case-sensitive
CO
Phone number(s) (up to 19 digits each).
Output to be activated by a Missed Call or
SMS (OU1/OU2)
Input to be monitored (IN1/IN2)
Sub parameters
User Limit UL (1–65536 activations)²
Output text string (user-configured messages 1-20)
Input text string (user-configured messages 1-20)
2. A user limit restricts the number of
times a Missed Call will activate the unit.
Once the user limit is reached, the phone
number will automatically be deleted from
the system
(Add Phone)
Add a phone
number to the
system
AP
4. Command Overview
Parameters
Four-digit password
(Password)
System
password
P
Description
If you add a ‘space’ and then the text ‘ACK’
to the end of any command, you will receive
an SMS back confirming that the command
has been received by the Module. For
example, p.xxxx.DP.0841234567 ACK
(Airtime)
Loads or queries
airtime
ACK

5. Setting a New System Password
Command Description
p.xxxx.CO.NP.
yyyy yyyy is the new password
Reset to the Factory Default Settings
In the event that you forget the system password you will need to reset
the Module to the Factory Default settings. To do this, please follow the
steps below:
1. Power down the Module.
2. Bridge the following terminals: IN1, IN2 and GND.
3. Short out the defaulting pads by touching across them with the tip
of a screwdriver.
4. Power up the Module.
5. Remove the bridges to the terminals as mentioned in point 2 and 3
above, as well as the defaulting pads.
6. The Module will now be reset to the Factory Default settings.
STR. Programming Input and Output
Text Strings
The system allows the user to pre-program up to 20 text messages
(of 25 characters each); the user can then associate messages with
specific actions such as the activation of an Output or as an Input
notification message. Each message is assigned a number, between
1 and 20, by the user and when an Input is configured to send
notifications, or an Output configured to be activated via SMS, the user
must specify what message number that Input/Output will use.
To configure text strings for Output activation and Input notification,
send the following command to the Module:
p.xxxx.CO.STR.y.‘‘text string’’, where ‘xxxx’ represents the password
and ‘y’ represents the memory slot – between 1 and 20 – to which the
text string should be assigned in the system’s memory.
The text between the double inverted commas is the command that will
be sent to the Module in order to activate an Output, or the text that will
appear on the user’s mobile phone screen when the associated Input is
activated.
Text strings are allocated to specific Outputs or Inputs by means of the
following command structure:
p.xxxx.AP.phone number.OUz.‘‘y’’.INz.‘‘y’’. In this instance, ‘‘xxxx’’
again represents the password, ‘‘z’’ is the number of the
Input/Output to which one wishes to assign a text string, and ‘‘y’’ is
the text string slot in the system’s memory.
Examples
&p.xxxx.CO.STR.1.‘‘pump active’’
This command will configure text string ‘‘1'’ as ‘‘pump active’’.
&p.xxxx.CO.STR.5.‘‘tan'k full’’.STR.6.‘‘tank empty’’
Configures text string 5 as ‘‘tank full’’ and text string 6 as
‘‘tank empty’’.
&P.xxxx.CO.STR.3.‘‘Open gate’’
This command configures text string 3 as ‘‘Open gate’’. The ‘‘Open
gate’’ command would be used to activate an output, the next
example illustrates this.
&p.xxxx.AP.0821234596.OU1.‘‘3’’
Adds phone number 0821234596 to the system and enables
Output 1 to be activated by an SMS. To activate the Output,
either SMS the text stored in memory location 3 to the Module, or
use the Output activation command p.xxxx.OU.OU1on
All of the information on the Module will be erased.
INxFT Sets the selected Input Filter Time
INxEC Sets the Input event counter
LM List all the messages stored in
the system; up to 20 messages
are allowed
Reset.all Resets all settings on the Module
Reset.usr Resets User Data on the Module
Reset.con Resets Configuration Data on the
Module
APME Enables All Pass Mode so that any
number that gives the Module a
Missed Call will activate the Outputs
AMPD Disables All Pass Mode
IMEI Retrieves the Module's IMEI
number
ENABLE Enables the unit
DISABLE Disables the unit
PCMS This command configures the
Module to react to free
Please Call Me messages,
either from any learn-in phone
number, or from a specific
authorised user.
(Maximum message length is
19 characters)
Sub-parameters
Pulse time: In milliseconds
New PIN: Four digits
New
password: Four digits
IO Mapping
Blanking
Time: In seconds
Filter Time: In seconds
Event count: Numeric value
(Configuration)
Configure Inputs,
Outputs and
system settings
CO
Parameters
Description

1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
Message number Message text string
(max. 25 character including spaces)
Description Parameters
Phone number(s) (up to 19 digits each)
Output to be activated by a Missed Call or SMS
(OU1/OU2)
Input to be monitored (IN1/IN2)
Sub-parameters
User Limit UL (1 – 65536 activations)
Output text string (user-configured messages 1-20)
Input text string (user-configured messages 1-20)
(Add phone)
Add a phone
number to the
system
AP
AP. Adding a Phone
This command allows new phone numbers to be added to the system.
When adding a new phone, it is possible to specify which Outputs are to
be activated by a Missed Call from the phone, and which Inputs will
cause a message to be sent to the phone. The number of times the
phone can be used to activate the system can also be specified.
Examples (Commands have been highlighted for clarity)
p.xxxx.AP.0841
234567.OU2
Adds phone number 0841234567 to the system,
and assigns Output 2 to be activated by a
Missed Call from this number.
Command Description
p.xxxx.AP.0841
234567
Adds phone number 0841234567 to the system and,
since no parameters are specified, by default
assigns Output 1 to be activated by a Missed Call
from this number. This allows easy addition of new
phones to a basic system.
For your convenience, a template has been provided below which can
be used to note down which text strings have been associated with
which number in the system’s memory. It is also possible to query the
Module as to which messages are saved in its memory by sending the
following command:
p.xxxx.co.lm, where ‘‘xxxx’’ represents the system password.
&p.xxxx.AP.0823359981.OU2.‘‘10’’.IN1R.‘‘3’’.IN1F.‘‘4’’
Adds phone number 0823359981 to the system and configures
Output 2 to be activated by text string 10, Input 1 to send an
SMS with text string 3 on rising edge activation and the same
Input to send an SMS with text string 4 on falling edge activation.
In such a case, text string 3 would typically be something like
‘‘power off’’ and text string 4 could be ‘‘power back on’’.
p.xxxx.AP.0841
234567.OU1.
OU2
Adds phone number 0841234567 to the system,
and assigns both Output 1 and Output 2 to be
activated by a Missed Call from this number.
p.xxxx.AP.0841
234567.083765
4321.OU1
Adds phone numbers 0841234567 and 0837654321
to the system, and assigns Output 1 to be activated
by a Missed Call from either of these numbers.
The number of phone numbers that can be added
in one command is limited only by the maximum
allowed message length (160 characters).
p.xxxx.AP.0841
234567.OU2.”5”
Adds phone number 0841234567 to the system,
and assigns Output 2 to be activated by sending
user-configured message number 5.
When programming the Output to be
activated by a specific text string, the text
string number MUST begin and end with
double quotation marks (” “). The quotation
marks (” “) are only required when
programming - they must not be included
when sending the text message to activate
the Output.
p.xxxx.AP.0845
632347.OU1.
UL20. “7"
Adds phone number 0841234567 to the system,
and assigns Output 1 to be activated by sending
user-configured message number 7 with a user
limit of 20 uses. After 20 SMSs (activations),
this number will automatically be deleted from the
system, but only if the number has no other
functionality associated with it.

This command produces the following Output:
&A Missed Call from this number will trigger
Output 1
&Output 2 is enabled for SMS and will be
triggered by message number 9
&A rising edge on Input 1 will send message
number 2
&A falling edge on Input 1 will send message
number 1
p.xxxx.AP.0844
332211.ou1.ou
2.‘‘9”.IN1r.‘‘2”.
IN1f.‘‘1”
p.xxxx.AP.0841
234567.OU1.
UL25.OU2
Adds phone number 0841234567 to the system,
and assigns both Output 1 and Output 2 to be
activated by a Missed Call from this number.
Output 1 has a limit of 25 uses. After 25 Missed
Calls (activations), Output 1 will no longer be
activated by a Missed Call. However, Output 2 will
continue to function indefinitely.
p.xxxx.AP.0841
234567.OU1.
UL25.OU2.
UL100
Adds phone number 0841234567 to the system,
and assigns both Output 1 and Output 2 to be
activated by a Missed Call from this number.
Output 1 has a limit of 25 uses, and Output 2 has
a limit of 100 uses. After 25 Missed Calls
(activations), Output 1 will no longer be activated
by a Missed Call. However, Output 2 will continue
to function for a further 75 calls. Thereafter, this
number will automatically be deleted from the
system.
This command allows one or more numbers to be deleted from
the system
Examples (Commands have been highlighted for clarity)
Command Description
p.xxxx.DP.0841
234567
Deletes phone number 0841234567 from the
system
p.xxxx.DP.0841
234567.08376
54321.082776
6554
Deletes phone numbers 0841234567, 0837654321
and 0827766554 from the system
Description Parameters
Phone number(s) (up to 19 digits)
(Delete Phone)
from the system
DP
DP. Deleting a Phone
This command allows the functionality of a phone to be edited.
It is useful when a number has been added with the wrong
functionality, or when circumstances have changed.
EP. Editing a Phone
Description Parameters
Phone number(s) (up to 19 digits each)
OU1 Activates Output 1
DOU1 Deletes Output 1
OU2 Activates Output 2
DOU2 Deletes Output 2
IN1 Activates Input 1
DIN1 Deletes Input 1
IN2 Activates Input 2
DIN2 Deletes Input 2
DIN1S Deletes Input 1 string
DIN2S Deletes Input 2 string
DOU1S Deletes Output 1 string
DOU2S Deletes Output 2 string
Sub-parameters
Output text string (user-configured message)
Input text string (user-configured message)
(Edit phone)
Edit phone
EP
This command allows the functionality of a phone in the system
to be queried. Information for that phone, including what
Outputs and Inputs are active, text strings and limited uses
counters will be sent in a text message to the querying phone.
QP. Querying a Phone
Description Parameters
Phone number(s) (up to 19 digits)
(Query Phone)
Query phone
settings
(Query Phone
Master) Returns
the master phone
number
QP
QPM
Adds phone number 0841234567 to the system,
and assigns Output 1 to be activated by a Missed
Call from this number, with a limit of five uses.
After five Missed Calls (activations), this number
will automatically be deleted from the system,
but only if the number has no other functionality
associated with it.
p.xxxx.AP.08412
34567.OU1.UL5

A. SIM card PIN Code Settings
p.xxxx.CO.DSL
Disables sticky latches, so that when the Module’s
power is cycled, the Outputs will return to their
default state and will not assume the state they
were in prior to the power cycle.
p.xxxx.CO.IN1R
p.xxxx.CO.ESL
p.xxxx.CO.STR.1.
‘‘alarm
activated”.STR.5.
“power failed”
p.xxxx.CO.STR.18.
‘‘open gate”
Enables sticky latches, so that when the Module’s
power is cycled, the Output relays assume the
state they were in prior to the power cycle.
Configures text string 1 as “alarm activated” and
text string 5 as “power failed”. If, for instance,
these text strings are assigned to certain Inputs,
an SMS containing this text will be sent to users
upon activation of the Inputs associated with
them.
Configures text string 18 as “open gate”. The text
string “open gate” (without quotation marks) can
be SMSd to the Module and used to activate an
Output.
Configures Input 1 to send an SMS if a rising
edge signal is present.
p.xxxx.CO.IN2B
p.xxxx.CO.IN2BT.4
p.xxxx.CO.IN1FT.2
p.xxxx.CO.IN2EC.3
p.xxxx.CO.LM
Configures Input 2 to send SMSs on both rising
and falling edge activation.
Sets Input 2 to only become active and send an
SMS once four seconds have elapsed since the
previous trigger.
Sets Input 2 to become active and send an SMS
only if the Input has been valid for two seconds.
Sets Input 1 to send an SMS only if it has been
triggered three times.
Sends an SMS to the querying phone with a list
of all the messages stored in the system.
Command Description
p.xxxx.CO.CS.
yyyy
Change the SIM card PIN code. yyyy is the NEW
PIN code.
p.xxxx.CO.EP Enable checking of the SIM PIN number on
startup.
p.xxxx.CO.DP Disable checking of the SIM PIN number on startup.
CO. Configuring the Module
This command allows the functionality of the system to be
configured. Outputs can be set up, states of Input/Outputs
checked, PINs and passwords managed, etc.
Examples (Commands have been highlighted for clarity)
Command Output configuration
p.xxxx.CO.OU1PU.
OU1PT.2000
Sets Output 1 as pulsed, and sets Output 1
pulse time to two seconds (2000 milliseconds).
p.xxxx.CO.OU1LA.
OU2PU.OU2PT.
1500
Sets Output 1 as latched, sets Output 2 as
pulsed, and sets Output 2 pulse time to 1.5
seconds (1500 milliseconds).
p.xxxx.CO.SS
p.xxxx.CO.QB
p.xxxx.CO.CL
Sends an SMS to the querying phone with a
value of 5 (strongest) to 1 (weakest) for signal
strength.
Sends an SMS to the querying phone with the
battery voltage value.
Clears all the transaction logs stored in the
system’s memory.
Examples (Commands have been highlighted for clarity)
Command Description
p.xxxx.QP.0841
234567
Queries phone number 0841234567. Phone settings
are sent via SMS to the querying device.
This command allows an airtime voucher to be loaded,
or remaining airtime to be queried.
AT. Airtime
Description Parameters
Load airtime (L)
Query airtime (Q)
Sub-Parameters
Airtime voucher number
(Airtime)
Loads or queries
airtime
AT
Examples (Commands have been highlighted for clarity)
Command Description
p.xxxx.AT.L.123
4567890
Loads airtime voucher number 1234567890 onto
the SIM.
p.xxxx.AT.Q Airtime remaining on the SIM is sent via SMS to
the querying device.

B. Query Firmware version
The following commands require an optional Memory Backup
Module (Product code PCA12201V1.0). See Section 6 of the
Pocket Installation Guide for location of Backup Module port
D. Backing up and Restoring the Memory
C. Query controller status/settings
Command Description
p.xxxx.CO.QS
Sends an SMS to the querying phone with the
following information:
&Current state of the Outputs
&Current state of the Inputs
& Output configuration (Pulsed/Latched)
& Output pulse times
& Input-Output mappings
& IP address and port of host server
E. Mapping Inputs to Outputs
F. Clearing Memory
p.xxxx.CO.IO.
Allows activation and deactivation of Input-Output
mappings. If an Input is mapped to an Output, and that
Input is activated, the mapped Output will also activate,
responding according to its configuration settings:
IN1OU1: Maps Input 1 to Output 1
IN1OU2: Maps Input 1 to Output 2
IN2OU1: Maps Input 2 to Output 1
IN2OU2: Maps Input 2 to Output 2
DIN1OU1: Deletes Input 1 to Output 1 mapping
DIN1OU2: Deletes Input 1 to Output 2 mapping
DIN2OU1: Deletes Input 2 to Output 1 mapping
DIN2OU2: Deletes Input 2 to Output 2 mapping
Even though a preconfigured SMS text may have been assigned
to Outputs when adding a phone to the system, the Outputs on
the Module can also be explicitly activated by sending an SMS to
the Module.
For added convenience and flexibility, the system does allow
numbers that have not been learned into memory to activate
Outputs via SMS; however, this functionality is password-
protected and the owner of the originating number will have to be
in possession of the system password in order to activate Outputs
in this manner.
Outputs can be activated with one of the commands below:
&OU.OU1on Output command --- Output 1 on
&OU.OU2on Output command --- Output 2 on
&OU.OU1off Output command --- Output 1 off
&OU.OU2off Output command --- Output 2 off
&OU.OU1on2off Output command --- Output 1 on and 2 off
&OU.OU2on1off Output command --- Output 2 on and 1 off
&OU.allon Output command --- both Outputs on
&OU.alloff Output command --- both Outputs off
Example
&p.1234.OU.OU2ON Switches Output 2 on
G. Alternative SMS Activation of Outputs
Setting the new SIM PIN number in memory only
(Useful when a new SIM is going to be inserted in
the future. On startup, the Module will
automatically try this PIN if the old PIN does not
work). yyyy is the new PIN number. The old PIN
number does not have to be entered.
p.xxxx.CO.SP.
yyyy
Command Description
p.xxxx.CO.QF Sends an SMS to the querying phone with the
Module’s firmware version.
Command Description
p.xxxx.CO.BE
Back up the entire Module memory (EEPROM) onto a
Backup Memory Module.
This includes all user information and Module settings.
The Memory Backup Module must be in place before
the command is sent to the Module. After sending the
command, a confirmation SMS will be sent back
indicating whether the backup was successful or not.
p.xxxx.CO.RE
Restore the entire Module memory (EEPROM) from a
Backup Memory Module.
This includes all user information and Module settings.
The Backup Memory Module must be in place before
the command is sent to the Module.
After sending the command, a confirmation SMS will
be sent back indicating whether the restore was
successful or not.
Command Description
p.xxxx.CO.reset.all
Resets the entire Module. All user information is
deleted, and all Module settings are restored to
Factory Default.
p.xxxx.CO.reset.usr Deletes all user information on the Module.
Module settings are not affected.
p.xxxx.CO.reset.con Resets all Module settings to Factory Defaults.
User information is not affected.

Command Description
p.xxxx.OU.OU1on
Activates Output 1. If OU1 is set as pulsed, the
Output will activate for the configured pulse time If
OU1 is set as latched, it will turn on and remain on.
p.xxxx.OU.OU2off
Deactivates Output 2. If OU2 is set to pulsed, the
command will have no effect. If OU2 is set to
latched, and currently on, it will turn off.
Examples
This function will ONLY trigger Relay 1
H. Please Call Me Activations
Command Description
p.xxxx.CO.PCMS.
”Please call”
Configures the Module so that a Please Call Me
message from any authorised phone number will
activate Output 1. The incoming please call me
SMS must contain the "Please call" text in order to
trigger output 1.
p.xxxx.CO.PCMS.
”call
0811234678”
Configures the Module so that a Please Call Me
message from a specific authorised phone number,
in this case 0811234678, will activate Output 1.
The incoming please call me SMS must contain the
"call 08112345678" text in order to trigger output 1.
&You can use the text ‘‘me’’ instead of specifying your own number
when adding, deleting, editing or querying your phone.
For example, p.xxxx.AP.me
&If you make a mistake during the programming via a mobile phone,
you will receive an ‘error’ SMS to let you know
Tips and Tricks
The Module must have sufficient airtime credit to send the SMSs.
Examples

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