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A serial port typically can only be monitored or transmitted to by one device at a time under the constraints of most operating systems, but a virtual serial port program can create two virtual ports, allowing two separate applications to monitor the same data.
Since the control signals for a serial port can be driven by any digital signal, some applications used the control lines of a serial port to monitor external devices, without exchanging serial data. A common commercial application of this principle was for some models of uninterruptible power supply which used the control lines to signal loss ...
"Y" cables may be used to allow using another serial port to monitor all traffic on one direction. A serial line analyzer is a device similar to a logic analyzer but specialized for RS-232's voltage levels, connectors, and, where used, clock signals; it collects, stores, and displays the data and control signals, allowing developers to view ...
COM port (DE-9 connector). COM (communication port) [1] [2] is the original, yet still common, name of the serial port interface on PC-compatible computers. It can refer not only to physical ports, but also to emulated ports, such as ports created by Bluetooth or USB adapters.
As management via serial port has traditionally been important on servers, a complete remote management system also allows interfacing with the server through a serial over LAN cable. As sending monitor output through the network is bandwidth intensive, cards like AMI's MegaRAC use built-in video compression [ 2 ] (versions of VNC are often ...
The Linux console provides a way for the kernel and other processes to output text-based messages to the user, and to receive text-based input from the user. In Linux, several devices can be used as system console: a virtual terminal, [8] serial port, [9] USB serial port, [10] VGA in text-mode, [11] framebuffer. [12]
Among the tools that can be used through this interface are nmap with the vizualization tool ZenMap, ntop, a Network Interface Bandwidth Monitor, a Network Segment ARP Scanner, a session manager for VNC, a minicom-based terminal server, serial port monitoring, and WPA PSK management.
This virtual COM port can be accessed and used as if it was a built-in serial COM-port. However, the characteristics of the virtual COM-port are not exactly the same as a real internal COM port, mainly due to data latency ; which means that if very sensitive and precise data transfer is required, the USB to serial adapter might be unreliable ...