The Gcom 520 is an ICASA approved dual I/O universal GSM controller suitable for domestic and industrial control and monitoring using SMS commands and alarm messages. The free missed call output pulse function is ideal for controlling automated gate systems providing high security access control for pre-registered users.



StoresĀ up to 600 telephone number for access control.
Permanent or time limited user access (ideal for hotels and guest houses)
Real time calendar clock.
Configuration parameters remotely set by SMS or internet
Supply voltage monitoring (will SMS a warning message if low voltage).
Dual channel optically isolated inputs for ON/OFF condition monitoring or SMS alarming.
2 x Programmable time delays for input monitoring.
2 x Output relays operated from SMS commands or free missed call
User programmable alarm and command messages (alarm message can also be SMS command to another Gcom500/520).
Status and remaining airtime reporting.
7 day activity log reporting.
Compatible with all local GSM networks.
Very low power consumption. (less than 20mA in standby).
Operates from 8 to 32VDC power supply (battery back up recommended).
Low voltage output relays rated at 1A (non inductive).
IP50 housing.
ICASA approved.


Access control systems
Alarm control
Electric fence control and monitoring
Guest house facility
Refrigeration monitoring.
Remote pump control/water level monitoring.

Product Documentation