Chapter 3: AT Commands Reference
April 15, 2008 G24-L AT Commands Reference Manual 3-201
Figure 3-9: 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-L activates its Sleep mode module.
• Wakeup Mode: The G24-L does not enter sleep mode, and the terminal can send data.
Once the terminal changes the line edge to Wakeup mode, it needs a 10 ms delay before sending
any data to the G24-L (using the RS232 protocol).
G24-L Wakes the Terminal
•
The G24-L follows these steps in order to wake up the terminal:
• The G24-L indicates to the terminal that it has data and that it must wake up. The G24-L 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-L gets the output wakeup line to high.
Figure 3-10: Wake up Outline
WAKEUP-IN
Line (pin #16)
TXD
Line (pin #21)
10 ms
Wakeup
Idle
Data transmit
