The serial.sys system process is a system-supplied driver file for serial devices. Serial also functions as a lower-level filter driver for any Plug and Play device requiring a UART-compatible interface. Serial.sys sends data one bit per sequence, over a computer bus, in contrast to parallel.sys where bits are sent in packets via a link composed of parallel channels. Serial.sys is used for long-haul communications and on most computer networks in which the synchronization cable cost makes the parallel communication turn out to be impractical. Serial.sys is used for: • A driver for plug-and-play serial and legacy devices • A filter driver for lower-level and plug-and-play devices such as a UART-compatible interface (e.g. PCMCIA bus modem configuration) • Identical operation between a filter driver and a function driver Serial.sys features the following: • Power management, plug-and-play, and WMI or Windows Management Instrumentation • Power policy owner for serial device stack • Support for unlimited standalone serial ports, multiport boards, and COM ports. • Control of interrupts and device hardware communication.

Most non-system processes that are running can be stopped because they are not involved in running your operating system. serial.sys. is used by Serial service, If you shut down serial.sys, it will likely start again at a later time either after you restart your computer or after an application start. To stop serial.sys, permanently you need to uninstall the application that runs this process which in this case is Serial service, from your system.

After uninstalling applications it is a good idea to scan you Windows registry for any left over traces of applications. Registry Reviver by ReviverSoft is a great tool for doing this.

The ReviverSoft experts have not yet reviewed serial.sys

A process usually a part of an installed application such as Serial service, or your operating system that is responsible for running in functions of that application. Some application require that they have processes running all the time so they can do things such as check for updates or notify you when you get an instant message. Some poorly written applications have many processes that run that may not be required and take up valuable processing power within your computer.

We have not received any complaint about this process having higher than normal impact on PC performance. If you have had bad experiences with it please let us know in a comment below and we will investigate it further.

The first thing you should do if serial.sys. is causing errors on your computer is to run a Windows registry scan with Registry Reviver If you are still seeing errors after this you should uninstall the program that serial.sys, belongs to, in this case Serial service