Quectel M12

M12 Hardware Design
M12_Hardware_Design_V3.3 - 56 -
RI
Idle Ring
Off-hook by“ATA”
On-hook by “ATH”
SMS
received
HIGH
LOW
Figure 37: RI behaviour of voice calling as a receiver
RI
Idle Ring
Data calling establish
SMS
received
HIGH
LOW
On-hook by “ATH”
Figure 38: RI behaviour of data calling as a receiver
RI
Idle Calling
On-hook
Talking
HIGH
LOW
Idle
Figure 39: RI behaviour as a caller
Quectel
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