Quectel MC60 Series User Manual

GSM/GPRS/GNSS Module Series
MC60 Series Hardware Design
MC60_Series_Hardware_Design Confidential / Released 76 / 114
3.15. Behaviors of the RI
Table 30: Behaviors of the RI
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.
RI
Idle Ring
Off-hook by “ATA”
On-hook by “ATH”
HIGH
LOW
SMS received
Figure 44: RI Behavior as a Receiver When Voice Calling
State
RI Response
Standby
HIGH
Voice Call
Change to LOW, and then:
 Change to HIGH when call is established.
 Change to HIGH when use ATH to hang up the call.
 Change to HIGH first when calling part hangs up and then change to LOW for
120ms indicating ―NO CARRIER‖ as an URC. After that, RI changes to HIGH
again.
 Change to HIGH when SMS is received.
SMS
When a new SMS comes, the RI changes to LOW and holds low level for about
120ms, and then changes to HIGH.
URC
Certain URCs can trigger 120ms low level on RI. For more details, please refer to
document [1].
Quectel
Confidential

Quectel MC60 Series Specifications

General

Brand	Quectel
Model	MC60 Series
Category	Control Unit
Language	English