User Manual

SIM900/A V3.8.2 DATASHEET
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The description of 1*6 pins:
5V
GND
VMCU
RST
TXD
RXD
Use the TTL interface connect with a MCU
MCU
SIM5320E MOULE
TXD
SRXD
RXD
STXD
DC power positive pole
VMCU
GND
GND
POWER(4.6-5.2v)
5V
Notice that:
1. The pin of VMCU is used for compatible the TTL interface. When the high level of the MCU is
5v like the 51 MCU, we should connect the DC5V to VMCU, when controller is 3.3V like the
stm32 MCU, the VMCU should connect the DC3.3V.
You also can use the Micro USB interface to control this module. When you use
the USB interface, you should power this module by a power adapter though the 5V
GND.
Besides, you should install the diver which has been offered for the USB
interface.
When you connect this module to PC, and the driver has been installed correctly,
you can see 5 COM offer by PC. And the ATCOM and NEMA are important.
We can send AT command to control it by ATCOM. And after we send the
AT+CGPS=1 to open the GPS function by ATCOM, we can receive the NEMA GPS
data by NEMACOM.