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Device Questions and Answers (Q&A)

S. Barnes

Driving down to Knowledge town

RS-232 and RS-485 are some of the oldest known serial interfaces. RS-232 was established around 1962. It worked by connecting data terminal equipment (DTE) to data communications equipment (DCE). It is commonly used because it is readily available. RS-232 is the most popular as it was one of the first serial interfaces to be created. However, RS-232 is limited in the distance as its cable length is usually 50ft or even less.

RS-232 also lacks multi-drop; a user is unable to connect more than one RS-232 protocol device per port. RS-485 has a much longer distance for communication, and it also has multi-drop. It works with multiple commanding devices and multiple listening devices. It generally has 2 to 4 wire system (based on the manufacturers). I hope you find this information helpful.

4 Answers

T. Lopez

Let's see how far my knowledge stretches

GPWS and EGPWS are two types of technologies which are used by pilot in ensuring the safety of the aircraft. GPWS is the short form of Ground Proximity Warning Signal, while EGPWS is the short form of Enhanced Ground Proximity Warning Signal. From the full form of the acronyms, one can easily come to the knowledge that EGPWS is just the advanced form of GPWS. GPWS is used as a warning signal to inform the pilot whether the various conditions of the aircraft are still in good condition.

It uses an array of sensors, and this informs the pilot when the safety limits are being violated or breached. This technology helps the pilot to know whether the aircraft is going too close to the ground, or the aircraft is diving too much. EGPWS, on the other hand is also designed to do exactly all the functions of GPWS, but it comes with the additional feature of GPS (Global Positioning System). This helps the pilot to know the exact location of the aircraft.

3 Answers

R. Jones

Curious about the World

MOSFET stands for metal oxide semiconductor field-effect transistor, and IGBT stands for insulated gate bipolar transistor. These are two types of transistors, and both of them belong to the gate driven category. MOSFET's are available in four different models. These include n channel or p channel with either in depletion or enhancement mode.

Although both IGBT and MOSFET are voltage- controlled devices, IGBT has a BJT like conduction characteristic. Terminals of IGBT are recognized as emitter, collector, and gate and MOSFET is made of the gate, source, and drain. IGBT's are better in power handling. IGBT has PN. MOSFET's doesn't have them. IGBT has a lower forward voltage drop when compared to IGBT.

3 Answers

R. Jones

Curious about the World

CMOS means Complementary Metal Oxide Semiconductor, while BIOS is the short form of Basic Input Output system. Both terms are used together in computer and they are created to perform different purposes but in the process they work together.

While BIOS is just a software which manages and controls the hardware of a computer as soon as soon you start the computer, CMOS uses its chip to provide and store information that BIOS will act upon. BIOS prepares all the applications and resources needed by the operating system of the computer to function properly. CMOS is mostly used to perform this function because it does not consume too much power.

CMOS is always on, even when the system goes off, it uses CR2032 battery to keep functioning. However, when the system goes off and the battery is completely down, information stored on CMOS will be lost. BIOS, on the other hand, is not always powered because it works only for a main time.

2 Answers

Flash Drives and Hard Drives are used to expand the memory capacity of a computer. We are currently living in a world that gives us every reason to have a lot of files, data stored on our personal computer. But most times we end up exhausting the huge internal memory capacity that comes with our computer.

This is exactly where flash drives and hard drives come in handy. However, there are some differences between the two. In terms of capacity, hard drive is a great deal because it can be used to store files that are up to 2 terabytes, while a flash drive has a total storage capacity of 128GB.

The good thing about the high memory capacity of hard drives is that, they can be used to store all files or content in a computer for backup purpose. Another difference is that; Flash drives are quite expensive than hard drives. Finally, hard drives need power source for memory storage, while flash drives don't need it

2 Answers

B. Wright

Always excited to learn and talk about new topics

Weed eaters, which are also known as string trimmers, these are devices for trimming grasses and some other foliage. This device was invented in the year 1972, and it has made grass trimming very easier. Since the invention of this device, there have been efforts put in place to improve on this device, or to get another device that can perform the same operation better. Bladed trimmers are also used to trim grasses, but it differs from the string trimmers because it makes use of blades to cut the grass, while the string trimmers make use of monofilament line in cutting grass.

They have several designs of which they come with depending on the thickness of foliage to be cut. The two devices can actually be powered with gas or electricity (battery) as a source of power. The string trimmers that are gas-powered can be of 2-cycle or 4-cycle engine, where which the 4-cycle engine is more powerful, heavier, louder, and of course more expensive than the 2-cycle engine.

2 Answers

T. Lopez

Let's see how far my knowledge stretches

When televisions went digital, they used a format called MPEG-2. It allowed the movies and television shows to be broadcast through cable and linear systems. Sometimes, they were used by the satellite. There are eleven parts to it with the latest being created in 2004. MPEG4 is another type of format for handling audio and digital information.


It is compressed so that it can be broadcasted to the different channels that people use on their television. However, the difference between these two, MPEG-2 and MPEG-4, is that the MPEG-4 is a more updated version because it was created later with its latest part, part 33, being under development now. Its part 30 was established in 2014, which is ten years later than the last part of MPEG-2.

1 Answer

S. Barnes

Driving down to Knowledge town

The function of the input device is to give information to the computer for processing and to transfer data into the central unit. Output devices provide the user with information. The input device is used first, and the output device is used second. The input device is cheaper to use. The most routine input devices are the mouse, keyboard, webcam, and scanner. Output devices change data from the computer language to an externally adequate form. These are the units utilized to convert binary encoded data from the central unit into a form suitable for human use. Examples of conventional output devices are the monitor, printer, and speaker.

1 Answer

Both Xbox Live and the PlayStation network can be regarded as the best online gaming consoles. You are definitely going to enjoy a lot from the two gaming networks. However, while you are to enjoy a lot of excellent services from both Xbox Live and PlayStation network, there are however some differences between the two online gaming consoles. With PlayStation network, you will be able to have access to its offline service; this means you can still use the console while offline whereas Xbox live does not totally provide an offline service for its users unless a situation where the users are subscribing to its premium services.

Another difference is that Xbox live provides excellent customer service for its users; this means you can easily run to its customer service anytime you are experiencing problems with your Xbox live console. While reaching the customer service of the PlayStation network can be very difficult. Xbox live also has a better server compared to the PlayStation network

1 Answer

Sonos and Airport Express are two types of audio streaming devices. Both have different advantages over each other, and they are good for streaming audio files. Sonos is known as one of the most powerful audio streaming devices. Its strength and connectivity are why it is more demanded than all other audio streaming devices. Sonos grants you access to different available radio stations. Sonos device can connect to the internet and play online audio material without necessarily connecting it to a computer, mobile, or any other devices.

This means while you are having low internet connection or no connection, you can still be playing online audio files. Airport Express, on the other hand, is also a type of audio streaming device. You need a computer or mobile phone to set up an airport express. And after making your connection, you can only stream a song at a time. However, Airport Express is cheaper than Sonio.

1 Answer

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