#Redirector htm drivers
The performance drawbacks of simple redirector implementations can be largely addressed by kernel-level drivers that avoid context switches. The performance of a COM port redirector is determined by both its implementation and the network it uses to reach device servers. The redirector GUI typically also includes displays of virtual COM port activity and various diagnostic aids. The COM port redirector then begins relaying the application data stream between the virtual COM port and the device server.Ī redirector will typically permit creation of many (at least 256) virtual COM ports, but simultaneous use of hundreds of ports is often practically limited by a number of factors, including the memory and processor requirements of the redirector, limits on operating system resources, and the performance of the network stack.Ī redirector for the Windows operating system is typically configured using a control-panel style graphical user interface for creating virtual COM ports, configuring settings for individual COM ports, and configuring global settings affecting all COM ports. When the application opens the virtual COM port, the redirector makes an IP network connection to the device server at the specified IP address and TCP/UDP port number that corresponds to the remote device on the server. These issues are described in the Technology section below.Īpplications use a COM port redirector through one or more virtual COM ports that the redirector creates, as configured by the user. The main challenges arise in two other areas: the network connection to the device server and the behavior of the device server. A virtual COM port itself is a relatively simple software mechanism that can be implemented by driver software similar to that of a conventional COM port driver.
#Redirector htm serial
The purpose of the redirector is to make the virtual COM port exhibit behavior that closely resembles that of a "real" COM port, i.e., a COM port driver for local serial port hardware.
A COM port redirector ( tty port redirector under Unix/ Linux) is specialized software (often including device driver and user application) that includes the underlying network software necessary to access networked device servers that provide remote serial devices or modems.
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