Author: John Mulindi
-
How Modbus is used in Industrial Networks
Modbus is an open standardized communication protocol that was founded by Modicon. Initially it was designed for the communication among PLCs in industrial applications but it also gained significance use in building automation domain for instance in HVAC systems, DDCs and room control. In a nutshell, Modbus is an application layer messaging, protocol placed at…
-
Network Access Control Techniques
Access control methods are required in a network to ensure that only one user of the network is able to transmit at any one time. In ring-based local area networks (LANs), two commonly employed techniques are: Token Passing In this technique, a token i.e. a special bit pattern, is circulated. When a station wishes to…
-
Types of AC Motors
Classification of AC Motors The AC motors works by rotating the stator field, they make use of the natural alternating nature of the AC wave to turn the field coils on and off sequentially. Generally, AC motors can be classified into two groups: single-phase and polyphase, with each group being further subdivided into induction and…
-
What is the difference between Broadband and Baseband Transmission?
Broadband transmission is used for a network in which information is modulated onto a radio frequency carrier which passes through the transmission medium such as a coaxial cable. Broadband transmission allows a number of modulated radio frequency carriers to be simultaneously transmitted and therefore offers a multichannel capability. Normally the topology of broadband LANs is…
-
Features of a Serial Interface
In a serial interface, the data is sent 1 bit after the other on a single wire. Serial data is classified as being either synchronous or asynchronous. Synchronous data require that the data bytes be sent as group in a “package”. It is employed in advanced communication systems that move a lot of data. Asynchronous…
-
Designing a System to Measure & Display a Shaft Rotation Speed
We would like to design a system to measure and display the rotational speed of a shaft. To accomplish this, we shall use a number of integrated circuits (ICs) to create the desired functionality of this system. A simple technique to measure the speed is to count the number of shaft rotations during a given…
-
The Parts and Functions of a Valve
A valve is a mechanical device that controls the flow of fluid and pressure within a system or process. A valve controls system or process fluid flow and pressure by performing any of the following functions: Notwithstanding the type of the valve, all the valves have the following basic parts: Valve Body The body, sometimes…