... familiar with MCU, ARM system development process 2.profound knowledge of EMS, which helps to ... 1, familiar with MCU, ARM system development process 2, profound knowledge of EMS, which helps to design ... application of GSM/GPRS/CDMA/GPS and short distance wireless communication(2.4g, 433/315mhz)7, familiar with RS485/232 ... service offer , gsm product design ,sms controller, gsm/gprs communication product