M10 Hardware Design
Data calling Change LOW, then：
（1）Change to HIGH when establish calling.
（2）Use AT command ATH, the RI changes to HIGH.
SMS When receive SMS, The RI will change to LOW and hold low level about
120 ms, then change to HIGH.
URC Some URCs triggers 120ms low level on RI. For more details, please refer
to the document [10]
If the module is used as caller, the RI will maintain high. However, when it is used as receiver,
following is timing of ring.
RI
Power on Ring
Hang on
(talking)
MO or MT
Hang up
Ring
MO or MT
Hang up
Ring
HIGH
LOW
Figure 34: Module Services as Receiver
RI
Power on calling Hang up Echo talking
calling Echo Hang up
HIGH
LOW
Figure 35
: Module Services as caller
3.16 Network status indication
The NETLIGHT signal can be used to drive a network status indication LED lamp. The working
state of this pin is listed in following table:
Table 24: Working state of the NETLIGHT
State Module function
Off The module is not running
M10_HD_V1.00 - 52 -
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