The M2M-711D module is specially designed for the remote maintenance and upgrading the serial to network application solution. It is suitable for the harsh industrial field. M2M-711D provides 2 major technologies on networking. 1. VxServer mode: The VxServer is a virtual com middleware software. The VxServer with VxComm Driver can create virtual COM ports in Windows and maps them to the serial ports of the M2M-711D devices through the Ethernet / Wi-Fi network. The user's RS-232 client programs need only to change to the virtual COM port to access the serial devices connected to the device servers through the network. 2. Pair-connection mode: It provides TCP data tunneling between 2 serial devices. Therefore, by means of TCP/IP server/client infrastructure, M2M-711D can provide the remote serial data transmission by Ethernet or Wi-Fi (IEEE 802.11b/g) between local and remote sides. This solution can transfer the site condition of equipment accurately. The maintenance engineer can directly check and diagnose the device/PLC like on-site. This can reduce the huge maintenance cost to increase the competition of enterprises. Except for the functionality above, M2M-711D can also be support the Pair-Connection of other equipment (M-4131, M2M-720-A, M2M-710D…).