Hardware Design - Rainbow Technologies

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SIM300DZ Hardware DesignSynchronization between DTE and DCEWhen DCE powers on with the autobauding enabled, it is recommended to wait 2 to 3 secondsbefore sending the first AT character. After receiving the “OK” response, DTE and DCE arecorrectly synchronized.Restrictions on autobauding operation• The serial interface has to be operated at 8 data bits, no parity checkouting and 1 stop bit(factory setting).• The Unsolicited Result Codes like "RDY", "+CFUN: 1" and "+CPIN: READY” are notindicated when you start up the ME while autobauding is enabled. This is due to the fact thatthe new baud rate is not detected unless DTE and DCE are correctly synchronized asdescribed above.Debug port• Two lines on Serial Port Interface• Only contains Data lines /TXD and /RXD• Debug Port only used for debugging. It cannot be used for CSD call, FAX call. And theDebug port can not use multiplexing function;• Debug port supports the communication rate as following:9600, 19200, 38400, 57600, 115200bpsNote: You can use AT+IPR=x;&W to set a fixed baud rate and save the configuration tonon-volatile flash memory. After the configuration was saved as fixed baud rate, the UnsolicitedResult Codes like "RDY" should be received from the serial port all the time when the SIM300was power on.3.9.2 Software upgrade and serial PortThe TXD、RXD、DBG_TXD、DBG_RXD、GND must be connected to the IO connector whenuser need to upgrade software and debug software, the TXD、RXD should be used for softwareupgrade and the DBG_TXD、DBG_RXD for software debug. The PWRKEY pin is recommendedto connect to the IO connector. The user also can add a switch between the PWRKEY and theGND. The PWRKEY should be connected to the GND when SIM300DZ is upgrading software.Please refer to the following figure.SIM300DZ_HD_V2.03 3610.01.2007
SIM300DZ Hardware DesignFigure 14: Interface of software upgradeNote: The RTS PIN must be connected to the GND in the customer circuit when only the TXDand RXD used in the Serial Port communication.Figure 15: Interface of software debugNote: The serial port doesn’t support the RS_232 level, it only supports the TTL level. Youshould add the level converter IC between the DCE and DTE, if you connect it to the PC.SIM300DZ_HD_V2.03 3710.01.2007
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