![SIM Tech SIM5360A Скачать руководство пользователя страница 32](http://html1.mh-extra.com/html/sim-tech/sim5360a/sim5360a_hardware-design_1274309032.webp)
Smart Machine Smart Decision
SIM5360_Hardware Design_V1.06
2016-11-17
32
Table 12: Logic level
Symbol
Parameter
Min
Typ
Max
Unit
V
IH
High-level input voltage
1.26
1.8
2.1
V
V
IL
Low-level input voltage
-0.3
0
0.63
V
V
OH
High-level output voltage
1.35
-
1.8
V
V
OL
Low-level output voltage
0
0
0.45
V
3.5.2
Application Guide
If UART port is used in Null Modem, the pin “RI” can be used as an interrupt signal to HOST. Normally it
will keep high logic level until certain condition such as receiving SMS, voice call (CSD, video) or URC
reporting, then “RI” will change to low logic level to inform the master (client PC). It will stay low until
the master clears the interrupt event with AT command.
Idle
HIGH
LOW
Receiving SMS , incoming
voice (CSD, video) call and
any URC report.
AT+CFGRI=1
RI
Clear by AT+CRIRS
Idle
HIGH
LOW
R eceiving SMS , incoming
voice (CSD, video) call only.
AT+CFGRI=0
RI
Clear by AT+CRIRS
Figure 19: RI behaviour in NULL Modem
If Full Modem is used to establish communication between devices, the pin “RI” is another operation
status. Initially it keeps high, when a voice call or CSD call comes, the pin “RI” will change to low for
about 5900ms, then it will return to high level for 100ms. It will repeat this procedure until this call is
answered or hung up.
HIGH
LOW Idle
Ring
Establish
the call
Hang up
the call
Idle
RI
100ms
5900ms
Figure 20: RI behaviour in FULL Modem
SIMCOM
CONFIDENTIAL
FILE