Shenzhen Neoway Technology Co., Ltd. Page 21 of 32
5) Pull DTR high, the module will exit from sleep mode actively, and furthermore enable the
UART. Thus the voice call, received data, or SMS can be processed through UART. After
processing finished pull it low again, to take the module back to sleep mode.
6.4.2 RING
1) Once the incoming voice call, the module sends out “ring” message through UART and
meanwhile outputs 250mS low pulses at 4S period on RING signal. See Figure 14.
Figure 14 RING indicator for incoming call
2) Upon receipt of SMS, the module outputs one 600mS low pulse. See Figure 15.
Figure 15 RING Indicator for SMS
6.5 SIM interface
Table5 SIM Interface
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