... , GPRS data modem, data terminal,GPRS DTU, TCP/IP modem, Support transparent data transfe, gprs ip modem, gsm modemgprs modem with rs232 rs485 io for m2m meter readinggprs modem(DTU) with I/OF2114 GPRS ... SystemItemContentCPUIndustrial 32 bits CPUFLASH512KB (Extendable)SRAM256KB(Extendable)Interface TypeItemContentSerial1 RS232 port and 1 RS485(orRS422) port, 15KV ESD protectionData bits: 5, 6 ,7 ...