1. Introduction
The Advent Controls Alpha GSM Relay Board has been primarily designed for security applica-
tions although can be used as a general purpose call/SMS activated relay. The board also
features two optically-isolated DC inputs which can be used to trigger dialling and/or sending
of customisable Short Message Service (SMS) alert messages to up to 512 numbers.
The relay can be activated by a call or SMS text from up to 512 stored telephone numbers or
can be configured to activate when receiving a call from any number. By default the call will
not be answered and hence costs the caller nothing. However, the system can also be set to
reject the call or connect a call when either the input is open or closed (or both). This allows
the input status to be determined even when the SIM card does not have credit for SMS text
messages.
Setup and operation is performed by simple SMS text messages including adding and remov-
ing user telephone numbers. A complete list of accepted telephone numbers can be viewed
via SMS text message. The memory can also be scanned to see if it contains an individual
number and the result is displayed by the on-board LED and (if enabled—see 2.10 TEXTRES) by
SMS text message. SIM card balance checking can also be achieved using the SMS and Ser-
vice data forwarding functions.
The output relay has both Normally Open (NO) and Normally Closed (NC) with Common
(COM) connections. The action of the relay can be a single timed actuation from either 1s to
999s or 1 to 999 minutes or the relay can be set to toggle between calls.
1.2 Technical Specification
Power Supply 12-24V AC or DC 400mA Max. (35-20mA idle)
Average Current (in-call) 60mA @ 28VDC, 95mA @ 18VDC, 130mA @12VDC
Relay Output 5A Max. CATII 220VAC
SIM 1.8/3.6V
Compliant with GSM Phase 2/2+ Class 4 (2W @850/900 MHz)
Class 1 (1W @1800/1900 MHz)
Antenna 50Ω U.FL
1.3 Number Types
When adding a telephone number to the system it can be set up as one of five different tele-
phone number types with each type having a specific purpose. There is space for 512 num-
bers and each number can be set up as any type of number. For example you may wish to
have 200 masters and 312 users. All four user (non-data) number groups can operate the out-
put relay by SMS text or by calling the board.
Master Numbers
These numbers are used to make changes to the system including adding other numbers. At
least one master number must be set up when the system is first used (see section 2.3). Once
one master number is set up it can then be used to set up other master numbers
Example Master Number setup command:
Master 07000000000.
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