... . Support DDNS IP modem, RS232 modem, GSM IP modem, GPRS data modem, data terminal,GPRS DTU, TCP/IP modem, Support transparent data ... system. It supports RS232 and RS485 (or RS422) port that can conveniently and transparently connect one device to ... CPUFLASH512KB (Extendable)SRAM256KB(Extendable)Interface TypeItemContentSerial1 RS232 port and 1 RS485(orRS422) port, 15KV ESD protectionData bits: 5, 6 ...