Serial Port Monitoring Control ActiveX Component (SPMC) - RS232 Data Acquisition and Com Port Control Component Library Modem Access Component. Connection Sniffer and Port Test Software Library. The library lets you enumerate all installed serial devices including but not limited to serial ports and modems. All kind of PnP serial devices as well as virtual devices are also supported. After you get an instance of the serial device you can create a monitor object and attach to the device to receive monitored data and events. The Monitor object can be attached to the device at any time no matter if the device is being currently used or not. You can also detach from the device at any time. Supporting a wide variety of programming languages and platforms the SPMC library makes it very easy to start using it in your software project.