Mcdata Serial Port Settings4/12/2021
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Mcdata Serial Port Settings Software On ThisPlease consider disabling your ad-blocking software on this site to help keep CHIRP free.Further, the Flow control setting invites further hope that enabling it will alleviate issues with data transfers. It is often suggested that if youre having trouble transferring data between a piece of software on your PC and an external serial device, that lowering the port speed in this dialog will lead to more reliable performance due to the slower rate of transfer. Of course, the same goes for enabling flow control, because after all, why not be extra careful of your flow by controlling it. For decades now, application software has told the operating system what port settings it needs in order to converse with its assigned device, and the operating system makes those changes at the time in which the port is opened. That means that if you set your port to a pokey 2400 baud, and enable flow control just to be extra careful, those settings are immediately overridden as soon as your application opens the serial port itself. It is important to note that almost all serial devices speak at only one baud rate (or at least, only the baud rate theyre configured to use). If the setting in this dialog truly affected all communication over this port, then adjusting it away from anything other than the correct setting would immediately prevent the software from communicating with the device. The same goes for flow control: a device expecting one of the flow control methods will generally refuse to talk to a computer that doesnt honor the same. Enabling it on your computer when the device isnt expecting it would have the same effect of disrupting communications. Before we had real operating systems (DOS was not really an operating system by the modern definition, but did provide some of these services eventually), it was up to each piece of software to control every aspect of the serial port during communication. Thus, the operating system (DOS, and later Windows attempting to support old DOS programs) provided a way to set the baud rate that would be used if an application were to just start reading and writing to the serial port. At this time, there was little or no notion of opening the port in an exclusive manner, so there was less opportunity to configure the settings. Thus, the Windows serial port settings dialog really only affects legacy programs from the early 1980s that depended on external configuration of the serial port. ![]() Remember that an i386 16MHz machine could do 9600 baud all day long with no trouble. Most machines in use today are at least a hundred times faster by even the most naive of measurements.
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