Справочник Пользователя для Motorola G24

sleep mode and signals its readiness for sleep. For this purpose, a set of AT commands and 
dedicated HW lines are defined.

The Sleep mode feature is not relevant when using USB. In USB mode the G24 is always 
awake. While USB is connected, do not use the following:
1. Sleep mode AT commands.
2. Sleep mode dedicated HW line (wake in/wake out).

The following are the Sleep mode AT commands:

ATS24: Activates/deactivates Sleep mode.

The G24 receives a request to activate or deactivate Sleep mode. 

ATS102: Sets the value of the delay before sending data to the terminal.

The G24 receives the value that defines the period to wait between sending the wake-up 
signal, and sending data to the terminal.

ATS100: The minimum time that takes the Terminal to enter sleep mode. Only if this time 
period passes, the G24 will wait ATS102 time between wake-up out line and data 
transmission.

AT+MSCTS: The UART's CTS line control.

The G24 receives a request to define the behavior of the CTS line when the G24 is in Sleep 
mode. It enables or disables activation of the CTS line after wakeup.

Two HW lines are used:

One for waking the G24 (Wakeup-In)

One for waking the terminal (Wakeup-Out)

When the G24 is in Sleep mode, the CTS line is also inactive. The terminal does not send any 
characters to the G24 if the CTS is inactive, otherwise the character may be lost (Hardware Flow 
Control).

The terminal uses the Wakeup-In line (pin #16) to wake up the G24 when it wants to send data. 
When the Wakeup-In line is low, the G24 will not enter the Sleep mode. If the terminal has data to 
send while the G24 is sleeping, it activates the line (brings it to active low), then waits 30 ms (the 
time required to wake the G24). Only then can the terminal start sending data.