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L830-EB-11 Hardware User Manual
Page 24 of 39
Figure 3-12 Reference Circuit for N.O. SIM Card Slot
The principles of the N.O. SIM card slot are described as follows:
When the SIM card is detached, it connects an open circuit between CD and SW pins, and
drives the SIM_DETECT pin low.
When the SIM card is inserted, it connects the short circuit between CD and SW pins, and drives
the SIM_DETECT pin high.
3.5.3 USIM Hot-Plugging
The L830 module supports the SIM card hot-plugging function, which determines whether the SIM card is
inserted or detached by detecting the SIM_DETECT pin state of the SIM card slot.
The SIM card hot-plugging function can be configured by “AT+MSMPD” command, and the description for
AT command as shown in the following table:
AT Command Hot-plugging Detection Function Description
AT+MSMPD=1 Enable
Default value, the SIM card hot-plugging detection function
is enabled.
The module can detect whether the SIM card is inserted or
not through the SIM_DETECT pin state.
AT+MSMPD=0 Disable
The SIM card hot-plugging detect function is disabled.
The module reads the SIM card when starting up, and the
SIM_DETECT status will not be detected.
