AirLink MP595 / MP595W Modem User Guide
The MP modem also supports connections via IEEE802.11b/g (MP595 only). See Chapter 6 for more details.
Virtual serial port
The MP modem supports four virtual serial ports (VSPs). Three are reserved for internal use by the MP modem. The remaining VSP, which is called Sierra Wireless Application Interface 2, is assigned to a specific COM port that varies between users. This VSP can be used, for example, to send AT commands, or to run applications such as HyperTerminal→.
Special MP modem modes such as GPS that are supported on a serial port are also available on the virtual port. For example, with the virtual port enabled, a mapping application on your computer that normally listens for GPS messages on a serial port listens for those same messages on the virtual port.
The MP modem VSPs are available on both USB and Ethernet interfaces. For information on enabling a virtual serial port, see the MP 3G Modems AT Command Reference manual (document #2130810).
VPN support for RNAP
This feature allows for the exchange of Remote Network Access Protocol (RNAP1) data between the MP modem and a remote server accessible only through a Virtual Private Network (VPN) connection. When using this feature, you must have 3G Watcher running on the computer.
The MP modem sends RNAP data over Ethernet or USB to 3G Watcher on the computer. 3G Watcher places the RNAP data in a User Datagram Protocol/Internet Protocol (UDP/IP) packet and sends it over the VPN connection to the server. When 3G Watcher receives a UDP/IP packet containing RNAP data over the VPN connection, it disassembles the packet and sends the RNAP data to the MP modem.
You can enable this option using 3G Watcher software or AT commands. See the 3G Watcher online help and the MP 3G Modems AT Command Reference manual (document #2130810) for details.
1.RNAP is a Sierra Wireless proprietary protocol that encapsu- lates the MTP data that is sent to and from the MP modem. It ensures that both the MP modem and remote host recognize the data packets. See The Monitoring and Tracking Protocol Guide on page 18.
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