M10 Hardware Design
you the flexibility to put the GSM engine into operation no matter what baud rate your host
application is configured to. To take advantage of autobauding mode, specific attention should be
paid to the following requirements:
Synchronization between DTE and DCE:
When DCE powers on with the autobauding enabled, it is recommended to wait 2 to 3 seconds
before sending the first AT character. After receiving the “OK” response, DTE and DCE are
correctly synchronized.
Restrictions on autobauding operation
z The serial port has to be operated at 8 data bits, no parity and 1 stop bit (factory setting).
z The Unsolicited Result Codes like "RDY", "+CFUN: 1" and "+CPIN: READY” are not
indicated when you start up the ME while autobauding is enabled. This is due to the fact that
the new baud rate is not detected unless DTE and DCE are correctly synchronized as
described above.
Note: You can use “AT+IPR=x;&W” to set a fixed baud rate and save the configuration to
non-volatile flash memory. After the configuration is saved as fixed baud rate, the Unsolicited
Result Codes like "RDY" should be received from the serial port all the time when the module
is power on.
Debug port
z Two lines on Serial Port Interface
z Only contains Data lines DBG_TXD and DBG_RXD
z Debug Port is only used for debugging. It cannot be used for CSD call, FAX call, GPRS
service, AT command and the Debug port can not be use multiplexing function. It does not
support autobauding function.
3.8.2 Software upgrade and software debug
The TXD、RXD、DBG_TXD、DBG_RXD and GND must be connected to the IO 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. The user also can add a switch between the PWRKEY and the GND. The
PWRKEY should be connected to the GND when module is upgrading software. Please refer to
the following figures.
M10_HD_V1.00 - 36 -
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