Gsm Part Software Upgrade And Software Debug - SimCom SIM802 HD Manual

SIM802 Hardware Design
9600, 19200, 38400, 57600, 115200bps
Note: You can use software to set a fixed baud rate and save the configuration to non-volatile
flash memory. After the configuration was saved as fixed baud rate, the Unsolicited Result
Codes like "RDY" should be received from the serial port all the time when the SIM802 was
power on.

3.9.2 GSM part software upgrade and software debug

The TXD、RXD、DBG_TXD、DBG_RXD、GND must be connected to the IO connector when
user need to upgrade software and debug software, the TXD、RXD should be used for software
upgrade and the DBG_TXD 、 DBG_RXD for software debugging. The PWRKEY Pin is
recommended to connect to the IO connector. The user also can add a switch between the
PWRKEY and the GND. The PWRKEY should be connected to the GND when SIM802 is
upgrading software. Please refer to the following figure.
MODULE
(DCE)
TXD
RXD
GND
PWRKEY
Serial Port
Note: The RTS PIN must be connected to the GND in the customer circuit when only the TXD
and RXD used in the Serial Port communication.
SIM802_HD_V2.01
Figure 20: Connection of software upgrade
45
RXD
TXD
GND
PWRKEY
IO Connector
12.01.2010