Hardware Design - Rainbow Technologies

SIM300DZ Hardware DesignVoice callingChange LOW,then:(1)Change to HIGH when establish calling.(2)Use AT command ATH the RING hold LOW.(3)Sender hang up, change to HIGHData callingChange LOW,then:(1)Change to HIGH when establish calling.(2)Use AT command ATH , the RI change toHIGH.SMSWhen receive SMS, The RI will change to Low and hold low level about120 ms, then change to HIGH.If the module is used as caller, signal RI will maintain high. But when it is used as receiver,following is timing of RI.Figure 22: SIM300DZ Services as ReceiverFigure 23: SIM300DZ Services as caller3.16 Network status indication LED lampThe NETLIGHT (PIN 41) can be used to drive a network status indication LED lamp. Theworking state of this pin is listed in table22:SIM300DZ_HD_V2.03 4610.01.2007