The second LED, LED2 found by the 5 pin header, is used to display the result of a command.
The LED will flash twice to acknowledge the successful receipt of a command and will light
continuously for 2s to show the instruction has failed. It also illuminates during any call (valid or
invalid) and lights continuously when a signal cannot be found (network dependent).
2.2 Command Message Format
To operate the system a master GSM phone is used to send SMS text messages to the system
telephone number. All message follow a similar format as follows:
COMMAND<space>action. (eg. Master 07000000000.)
The command (see Section 7) is always written first followed by a space and the action re-
quired. Although not necessary, it is useful to include a full stop immediately after the action
as some mobile phones can enter superfluous characters at the end of a message, which can
invalidate the message. The message is not cAsE sensitive.
2.3 Master Number Setup
The system is controlled by the master GSM mobile phone numbers (see 2.2 Number Types).
The system must first be associated with at least one master phone’s number before it can be
used. To do this the supplied 2.54mm jumper connector must be fitted to pins 3 & 4 on HDR1
as shown in red in Figure 1. Do not connect the jumper to any other pins or damage may
result.
The master phone number must then be sent via a SMS text message to the system phone
number as follows:
MASTER<space>number.
For example, if the master telephone number is 07000 000 000:
MASTER 07000000000.
Also valid are the following:
Master 07000000000 and master 07000000000
The following messages are invalid:
master 07000 000 000. (spaces in the number)
master07000000000 (no space after ‘master’)
Figure 1. Jumper pins
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