SMS Option - Detailed Specification

The sent message:

• The Squirrel can send an SMS to a Group of up to 10 mobile numbers - one Group only is permitted.
• There are two types of message: Alarm Message and Summary Message.

Alarm Message

Sent immediately a channel goes into Alarm.

SMS	Function	No. of characters	Description	Example SMS
A Channel has just gone into Alarm	Squirrel Identity e.g. ASTON CROSS	2 to 17	The Squirrel identity is a user-configurable text string.
	Channel Identity e.g. OVEN 1	2 to 21	Each Squirrel channel in Alarm has an identity text string.
	Alarm High or Low	3	Indicates the Alarm condition for this Squirrel channel.
	Value e.g. 65.5	2 to 7	The value is always numeric and is a maximum string of 6 characters.
	Unit e.g. C	2 to 7	The unit is expressed as a text string e.g. C. Maximum 6 bytes.

Summary Message

Summary of all Alarms present, sent at the Next Alarm Time and Alarm Period. The maximum Text message length is 160 characters, the string is as follows:

SMS Logic

• No SMS message is sent if no channel is in Alarm
• An SMS message is sent immediately a channel goes into Alarm
• An SMS summarising all Channels in alarm is sent at every Alarm Period.

How is the 'Next Alarm Time' updated?

The 'Next Alarm Time' is initially set by the user. It is a time of day and is expressed using the 24 hour clock. Once this time is reached, the Squirrel updates it by adding the Alarm Period to it.

• The process happens regardless of whether any channels are in alarm.
• The process only happens when the Squirrel is logging.
• The Alarm Period is programmable. The value is set as hh:mm (24:00 maximum). One Alarm Period value only is permitted. An equal number of Periods should fit within each 24 hours

Timing Sequence: