Modem Configuration and Profile
3-284 AT Commands Reference Manual December 31, 2007
Figure 3-10: Wakeup-In Line
Two modes exist:
• Idle Mode: The terminal has no data to send. If the terminal enables sleep mode (using
ats24), the G24 activates its Sleep mode module.
• Wakeup Mode: The G24 does not enter sleep mode, and the terminal can send data.
Once the terminal changes the line edge to Wakeup mode, it needs a 30 ms delay before sending
any data to the G24 (using the RS232 protocol).
G24 Wakes the Terminal
•
The G24 follows these steps in order to wake up the terminal:
• The G24 indicates to the terminal that it has data and that it must wake up. The G24 uses the
Wakeup-Out Line (pin #26) (brings it to active low).
• While the Wakeup Out line is low, the terminal should not enter Sleep mode.
• The terminal should set a value of the delay (in ms) needed for waking it (using the ATS102
command) before receiving data (default value is 30 ms).
When the data transmission is complete, the G24 gets the output wakeup line to high.
Figure 3-11: Wake up Outline
WAKEUP-IN
Line (pin #16)
TXD
Line (pin #21)
30 ms
Wakeup
Idle
Data transmit
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