... 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 ... high-powered industrial 32 bits CPU and embedded real time operating system. It supports RS232 and RS485 (or RS422) port ... water supply, environment protection, post, weather, etc. High-performanceSupport TCP server and support multi TCP client connection( ...