A question frequently posed to the Weschler Application team is: How to convert the output of an existing current transformer into a DC process signal? In North America, current transformers typically have a 5 amp secondary. (more…)
Category: Blog
RS-485 Communication Overview
The RS-485 standard (also known as ANSI/TIA/EIA-485) was developed in the 1980s to allow a master device to communicate with multiple slave devices. RS-485 defines a method for serial transmission using differential signal lines shared by up to 32 devices. Its advantages over RS-232 include higher noise immunity, higher speed, and longer distance. Communication is asynchronous (no system clock). A master device controls data flow to and from the slave device(s). (more…)
Introduction to RS-232 Devices
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), the standard is now maintained by the Telecommunication Industry Association as TIA-232. (more…)
USB Interface Basics
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…)
Digital Panel Meters for Process Control
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…)