SIM Tech SIMCom SIM900-DS, Проектирование аппаратного обеспечения

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Smart Machine Smart Decision
HIGH
LOW
Idle Ring
Hang up the call
Establish the call
RI
Figure 29: RI behaviour of voice calling as a receiver
HIGH
LOW
Idle Ring
Hang up the call
Establish the call
RI
Figure 30: RI behaviour of data calling as a receiver
Figure 31: RI behaviour of URC or receive SMS
However, if the module is used as caller, the RI will remain high. Please refer to the following figure.
Figure 32: RI behaviour as a caller
4.12 Network Status Indication
The NETLIGHT pin can be used to drive a network status indication LED. The status of this pin is listed in
following table:
SIM900-DS_Hardware Design_V1.00
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2013-01-20