Setting up and Programming
Once you have installed the GSM-SWITCH and make the required connections to the device to be
controlled the SIM Card can now be installed in the Holder as indicated in the schematic drawing and the
Power Supply can be connected and switched on.
Note: You must remove the PIN request from the SIM before inserting it in the unit; otherwise the device
will not work. In order to do so, insert the SIM in a phone and disable the PIN Request and the Voicemail
function as this can also affect the system with some networks which can activate the voicemail before the
system has read the incoming telephone number!
On most SIM Card Network systems now the PIN requests are disabled but it is worth checking first and
removing the Voice Mail function.
The Signal Led (Green) on the board will oscillate infrequently until it finds and logs on to the Network and
will then flash every 3 seconds constantly and if does not happen then the unit has not logged on and it may
be required to use an extension antennae or alternative network provider or re-seat the SIM CARD.
At this stage the visual bank of LED signal indicators immediately above the Network LED will also illuminate
to indicate the system has logged on to the Network and will indicate either one to four bars of signal
strength
Once the system has logged on the Network the one thing you also can do is to establish is the “actual
Signal Strength”at the Location of the Installation to secure constant signal strength for the reliability of the
GSM-SWITCH and this can be done by simply sending the following SMS Text message to the unit.
*PSSW*SGH? And this is the only command that does not require a password and you will
receive the following similar SMS Message subject to the actual Signal strength
Signal strength < 18 >
This Signal Strength range can typically vary from “3-31” of which it is suggested that a consistent Signal
Strength acceptable should be at least 12 and above as the signal network strengths can vary dramatically
and a typical acceptable signal strength would be circa <10>-<15> and in the even of a Signal strength
below <7 > it would be suggested You install and external antenna to improve the Signal strength.
Programming the GSM-SWITCH
The GSM-SWITCH is programmed by either sending it SMS text commands from a mobile phone or using the
soft-ware provided and explained under separate cover.
The password command must pre-fix all SMS text commands and the default password can be changed to
any other 5 digit number of which must be noted as if lost or forgotten the only resolve is for the unit to be
reset by the factory.
Remember that all SMS text commands must always be sent in CAPITAL LETTERS and DO NOT add
spaces or any other characters otherwise the system will simply ignore the text messages and not perform
the commands.
Programming via SMS and Default Command
The GSM-SWITCH is pre- programmed and can be controlled by sending certain SMS Text Messaging to the
unit and is password protected with a factory default setting of five digits preset at *PSSW12345 and this
prefixes any commands to the unit and the unit is also set up as factory default to initially accept any
incoming telephone call which will activate the relay for one second, again which is set as factory default.
