... gsm modem, rs485 modem 2.with standard TCP/IP protocol stack, i/o 3.Support transparent data transfer 4. Support DDNS IP modem, RS232 modem, GSM IP modem ... 32 bits CPUFLASH512KB (Extendable)SRAM256KB(Extendable)Interface TypeItemContentSerial1 RS232 port and 1 RS485(orRS422) port, ... Power", "ACT", "Online"AntennaStandard SMA female interface, 50 ohm, lighting protection(optional)SIM/UIMStandard ...