N720 Hardware User Guide
Copyright © Neoway Technology Co., Ltd 28
3. In sleep mode, the external MCP can pull DTR high so that the module will exit from sleep
mode actively. Then the module can transmit data and initiate calls. After processing is finished, pull
DTR low again to take the module back to sleep mode.
4. In sleep mode, the module can be woken up by the events of incoming voice call, received data,
or SMS. Meanwhile the module will send out the unsolicited messages through the UART.
Upon receipt of the unsolicited messages, the host MCU should pull DTR high firstly, otherwise the
module will resume sleep mode in two minutes after the service processing. Then the host MCU can
process the voice call, received data, or SMS. After processing is finished, pull DTR low again to put
the module into sleep mode.
2.6.5 RING Signal Indicator
Calling: Once a voice call is incoming, UART outputs "RING" character strings and meanwhile the
RING pin outputs 30 ms low pulses in a period of 5 second. After the call is answered, the high level
restores.
Figure 2-21 RING indicator for incoming call
SMS: Upon receipt of SMS, the module outputs one 35 ms low pulse.
Figure 2-22 RING indicator for SMS
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