TECHNICAL REFERENCE AND USER’S GUIDE
REV A
GSM GATEWAY
This figure is used also in the system cabinet just above the motherboard as a reminder.
On/Off-1: It is turned on and off with the rhythm 500ms ON 500ms OFF.
On/Off-2: It is turned on and off with the rhythm 250ms ON 1750ms OFF.
On/Off-3: It is turned on and off with the rhythm 250ms ON 250ms OFF 250 ms ON 1250ms OFF.
5
Figure-5a
6
On/Off-4: It is turned on and off with the rhythm 250ms ON 250ms OFF 250 ms ON 250ms
OFF 250 ms ON 750ms OFF.
Notes on the LED statuses:
• When GT20/GT10 is powered, the leftmost green power LED is turned on. The four
LEDs signifying the statuses of channels light in red and green until the PLD on the
card is loaded (approximately 20 secs.)
• After the PLD has been loaded, communication is established with the GSM module,
the module is reset and the required parameters are loaded. (Start-up state.)
• Even though the signal is above a certain level, the channel may be in “No network”
status. This indicates that the module has not been able to connect to the GSM
network. In such a case, while LED12 / LED22 is continuously red, it will signify the
signal level through the green color. As an example, if the signal level is “Weak”,
then while the red is continuously on, the green will light for 250 ms once every 2
seconds.
IMPORTANT
Since GT10 is a single-channel device, the explanations for LED 21 and LED 22 in
the table that shows LED statuses do not apply for GT10.
The GSM modules on the motherboard support many features that a standard mobile
phone supports and these features can be presented into use through programming on
GT20/GT10.
Dimensions of the motherboard are 16.7 cm - 21 cm and it weighs 0.5 kg.
Figure-5b
LED DISPLAY
