User's Manual

GSM/GPRS/GNSS Module Series
MC60 Hardware Design
MC60_Hardware_Design Confidential / Released 66 / 99
If the module is used as a caller, the RI would maintain high except when the URC or SMS is received.
When it is used as a receiver, the timing of RI is shown below.
Figure 38: RI Behavior as a Receiver When Voice Calling
Figure 39: RI Behavior as a Caller
Figure 40: RI Behavior When URC or SMS Received
URC
Certain URCs can trigger 120ms low level on RI. For more details, please refer to
document [1]