Recommended Standard 232 (RS-232) was introduced in the1960s by the telecommunications industry. It defines a simple method for serial communication between a Data Terminal Equipment (DTE) device, such as a computer, and a single Data Communication Equipment (DCE) device, such as a modem or computer peripheral. Originally managed by the Electronics Industry Association (EIA-232), (more...)
The Universal Serial Bus (USB) originated in 1996 as a way to connect peripherals, such printers and scanners, to a personal computer. Since that time, it has evolved into a broadly used interface on a wide variety of products. (more...)
Panel mount digital controllers are commonly used for process control. However, many digital panel meters (DPMs) can also perform process control functions. A panel meter is a good choice when advanced control functions, such as PID, are not required, and on/off or proportional control is sufficient. Why use a panel meter? (more...)
The purpose of a tap changer is to regulate the output voltage of a transformer by altering the number of turns in one winding and thus changing the turns ratio of the transformer. There are two types of tap changers: a de-energized (off-load) tap changer and an energized (on-load) tap changer. (more...)
Flow is an essential measurement in many industrial processes. In the typical application, a flow sensor is used to determine the volume of liquid or gas that passes thru a pipe, in liters/sec, GPM or similar units. Modern sensors incorporate electronics that can correct for varying pressure, temperature, density, non-linearities, (more...)