17
GSM Indicators
The CH1 and CH2 indicators signal statuses of the respective GSM modules.
Whenever the 2N
®
BRI Lite is started, detection of the GSM modules and SIM
cards is carried out. This process is signalled by a red LED, which goes on a few
seconds after voltage is supplied. The GSM module detection takes a few seconds.
In case a GSM module or SIM card is absent, the red LED keeps shining. If a
GSM module is not supplied, the respective GSM LED is blinking red. After a
correct GSM module initialisation, the SIM card starts logging into the provider's
network, which is indicated by a quickly blinking green colour. If the log-in has
been successful, the LED goes out. If not, it shines red.
In normal operation, a slowly blinking green LED indicates establishing of an
incoming or outgoing call and a permanently green LED means a successfully
established
connection
within
the respective GSM module.
A survey of GSM module status signalling is included in Tab. 3
GSM indicators
GSM 1 or GSM 2
LED colour / status
The module is ready and logged-in
No light
Call establishing
Green / blinking slowly 1:1
Currently made call
Green / shining
SIM card initialisation
Green / blinking quickly 1:1
SIM card initialisation in progress
Shining red
GSM module / SIM card absent
Red / shining
GSM module not supplied
Red / blinking quickly
Tab. 3 - Survey of GSM Module Status Signalling
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