W3100SM is a server for instant conversion of the serial port communication of industrial RS232/485/422 serial port device into short message communication. It is applied to communication or control of long distance and small data volume. W3100SM relies on GSM network to send and receive short message. Using EIC-CS12 transparent transmission mode between 2 serial devices equals to the prolongation of communication distance of the serial ports and thus realizes the remote control between serial devices. The direct connection of serial devices has equipped serial devices with telecontrol function instantly. It is applicable to building automatic control, parking lot facilities, traffic control, LED screen control, factory, workshop, mine, bank and the telecontrol area of electrification.