Product Info

LTE-A Module Series
EM121R-GL Hardware Design
EM121R-GL Hardware Design 35 / 80
EM121R-GL supports (U)SIM card hot-plug via the USIM1_DET pin, which is a level triggered pin. The
USIM1_DET is normally short-circuited to ground when (U)SIM card is not inserted. When the (U)SIM
card is inserted, the USIM1_DET will change from low to high level. The rising edge indicates an insertion
of the (U)SIM card. When the (U)SIM card is removed, the USIM1_DET will change from high to low level.
This falling edge indicates a removal of the (U)SIM card.
USIM1_DET/USIM2_DET is pulled up by software configuration when (U)SIM hot-plug is enabled by
AT+QSIMDET (the command takes effect after the module is restarted, see document [3]).
4.1.2. (U)SIM Hot-plug
The module supports (U)SIM card hot-plug via (U)SIM card hot-plug detection pins (USIM1_DET and
USIM2_DET). (U)SIM card insertion is detected by high/low level. (U)SIM card hot-plug is disabled by
default.
The following command enables (U)SIM card hot-plug function.
42
USIM2_DATA
DIO, PU
(U)SIM2 card data
USIM2_VDD
1.8/3.0 V
44
USIM2_CLK
DO, PD
(U)SIM2 card clock
USIM2_VDD
1.8/3.0 V
46
USIM2_RST
DO, PD
(U)SIM2 card reset
USIM2_VDD
1.8/3.0 V
48
USIM2_VDD
PO
(U)SIM2 card power supply
1.8/3.0 V
AT+QSIMDET (U)SIM Card Detection
Test Command
AT+QSIMDET=?
Response
+QSIMDET: (list of supported <enable>s),(list of
supported <insert_level>s)
OK
Read Command
AT+QSIMDET?
Response
+QSIMDET: <enable>,<insert_level>
OK
Write Command
AT+QSIMDET=<enable>,<insert_level>
Response
OK
If there is any error:
ERROR
NOTE