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HIGH
LOW
However, if the module is used as caller, the RI will remain high. Please refer to the following figure.
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
RI
HIGH
LOW
Idle
Figure 29: RI behaviour of voice calling as a receiver
RI
Idle
Figure 30: RI behaviour of data calling as a receiver
Figure 31: RI behaviour of URC or receive SMS
Figure 32: RI behaviour as a caller
Establish the call
Hang up the call
Ring
Establish the call
Hang up the call
Ring
33
Smart Machine Smart Decision
2013-01-20
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