There are also cables with a handshaking simulation on a «stub» and partial handshaking without the ability to control the data transmission at the «hardware level». The following is the RS cable wiring with full handshaking recommended by Microsoft. At one point, the RS 9-pin Serial Port used to be a common connector on the back of every computer.
But with USB being a much better protocol and easier to use, the serial port has just about disappeared from modern desktop computers. If you want to know more about how I discovered this and the differences, then continue reading. When using the Keyspan adapter, the only caveat is that communication with the UPS is configured as using a serial cable instead of a USB cable. This caused a bit of a problem for me. For a typical USB configuration, apcupsd. This is because apcupsd will try all the known USB ports until it succeeds.
However, when using the Keyspan USB-to-serial adapter, apcupsd. The next time the server rebooted, it could have been ttyUSB1. This was unreliable, so I wanted to figure out what the problem was with my serial connection.
You may continue to utilize your older serial-enabled device through your new computer's USB port by utilizing a USB to serial converter.
When data is delivered over the USB interface, it arrives as a serial signal. Therefore, a USB to serial adapter can be used to convert data being sent serially via a cable to the old device into digital signals that can be read by its controller. A USB to serial adapter is useful for communicating with devices that use serial interfaces such as modems, scanners, and printers. It allows you to connect these devices directly to a computer without having to use a universal serial bus USB port on the computer itself.
The adapter then enables communication between the connected devices and the computer via their respective serial ports. However, some lower speed devices may also be compatible with certain models of USB to serial adapters. For example, many low speed modems operate at bps , which would be supported by an adapter capable of handling modems up to bps.
Thomas Lachenauer is a tech genius that has taken the world by storm. He was born in Boston, Massachusetts and went to Harvard for his undergraduate degree. He learned about technology at an early age from his father who is also in the industry. Thomas helped to create many useful programs during college such as "Tiny Chat" which allow people to chat anonymously with one another without revealing their identity or location.
Tiny Chat is now used by millions of people all over the world! Home Electronics What can you use with a serial port? What can you use with a serial port? Thomas Lachenauer. Table of Contents What can you use with a serial port? Are serial ports obsolete? What type of port is used to connect these devices to the computer? I have never seen even an old mouse without encoders.
And I took a lot apart in my day to clean them out. Author might be referring to the surreality that is the DEC hockeypuck mouse. Until the enameled pattern started wearing off the mouse pad. UofU had some of these in the CS lab around and between this and the out of date version of Emacs may be part of why the Linux side of the lab got more use. I had one for a PC, and loved it until they stopped providing driver updates for it.
For some reason, there was a time when new programs kept using previously unused mouse driver features, requiring frequent driver updates. Keytronic mouse. Bad mofo. Loved mine. I even scavved the junk for others and ordered three button packs for them. They all have encoders of some form. Not all are optical though.
Think yourself lucky that you never encountered the ones where the encoder is a round PCB with tracks in the encoder pattern and a set of springy contacts. A lot of early 90s cheap mice had them. Today that seems odd. I have one in a box somewhere, Envision an axle with a disk on the end, kind of like a dremel cutoff bit.
On that disk are traces that look like spokes emanating from a solid ring near the axle, but about halfway out, they dogleg a bit, and then continue out to the edge. Then, in the sensor there are three brushes. One toward the center that contacts the ring. This is the ground brush. Then about a third of the way out a brush the A signal , then two thirds of the way out another brush the B signal that picks up the trace after the dogleg.
So what happens is, A and B have pullups on them and will generate a square wave on the brush when rotated as the brush hits the ground trace on the wheel. This generates quadrature signaling.
Every edge is a count, although usually there is one bit of hysteresis to avoid jittering if the mouse stops on an edge. Put one encoder on a vertical axle, and another on a horizontal axle, and you can then determine XY motion distance and direction. Just to follow that up, an optical wheel encoder has a similar wheel but instead of traces, it is just a plastic wheel with actual spokes and gaps.
There is an IRLED placed on one side of the wheel, and a dual phototransistor placed on the other side such that one PTR is above the other, so that as the wheel rotates, a spoke covers one before the other. These never wear out but can get dirty. That stuff is still used in POV and some machines though, it should be usable; albeit sensitive to debris and feeling scratchy in use maybe.
And talking of which, the cheap mice have wheels that from the looks of it might actually also work with the old brush system come to think of it, while the actual sensor is modern. You can find this in the Device Manager and disable the serial mouse. The problem is getting control of your machine when this happens. Again, unplug the device. In remote observatories, this can be very hard to do, but keyboard navigation may work.
To prevent this from happening in future, make sure you disable any Serial Mouse listed in Device Manager. If it is not available, it may be found as an Upper Filter in the Registry associated with the device. It is tricky to find and fix that, and the use of the Windows Registry Editor is beyond the scope of this article.
Preventing Disconnects Windows power management can turn off USB devices, including serial ports and virtual com ports. Last edited: May 19, Colin Haig , May 18, You must log in or sign up to reply here.
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