Technical information

Chapter 2: Hardware Interface Description
November 15, 2008 G24-L Module Hardware Description 9
Operating Modes
G24-L incorporates several operating modes. Each operating mode is different in the active
features and interfaces.
Table 2-1 summarizes the general characteristics of the G24-L operating modes and provides
general guidelines for operation.
Table 2-1:
G24-L Operating Modes
Mode Description Features
Not Powered VCC supply is disconnected. The G24-L is Off.
Any signals connected to the interface con-
nector must be set low or tri-state.
RTC Mode Valid VCC supply.
RESET_N signal is enabled (low).
The G24-L Interfaces are Off. Only the inter-
nal RTC timer is operating. Any signals
connected to the interface connector must be
set low or tri-stated.
Idle Mode RESET_N signal is disabled (high).
CTS_N and DSR_N signals are enabled
(low).
The G24-L is fully active, registered to the
GSM network and ready to communicate.
This is the default power-up mode.
Sleep Mode RESET_N signal is high.
CTS_N signal is disabled.
The G24-L is in low power mode.
The application interfaces are disabled, but,
G24-L continues to monitor the GSM net-
work.
CSD call or
GPRS data
RESET_N signal is high.
TXEN_N signal is toggling.
A GSM voice or data call is in progress.When
the call terminates, G24-L returns to the last
operating state (Idle or Sleep).