In the second installment of this five-part series, Jon Titus explores the basic elements of a control system. Click the following link if you missed the first installment: Relays Explained….
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What are the differences between RS-232, RS-422, and RS-485 communication standards?
RS-232, RS-422, and RS-485 are serial communication methods for computers and devices. There are two articles in the Driver Downloads & Software section of the Sealevel Support site that address…
Can I use Sealevel reed relay cards to switch other relays or inductive loads?
…recommends using a Digital I/O product with Form C relays or open collectors outputs. You should remember to place a diode parallel to the coil or the inductive load to…
What is a Form A relay, and when should they be used?
Form A relays (or normally open/NO relay) have a single set of contacts that are normally open, meaning the circuit is open when the relay is not energized. When the…
How can I guarantee that different USB serial adapters will use the same COM port assignments?
When you connect a USB serial adapter to a computer, the operating system assigns individual COM port numbers to each serial port. Each USB serial adapter has a unique…
My Ethernet Serial Server is missing from the SeaLINK Device Discovery utility. How do I find it?
The most common solution is to disable all network adapters except for the one connected to the Ethernet Serial server, then try searching for the Ethernet Serial server again. On…
What is EtherNet/IP?
…PROFINET is used mostly in Europe, EtherNet/IP is used primarily in the U.S. EtherNet/IP combines the Common Industrial Protocol (CIP) with standard Ethernet technology. CIP is a media-independent, object-oriented communication…
What is synchronous communication?
Asynchronous communication is what everyone is used to. Every device you normally connect to a computer is going to be using asynchronous communication. It’s a time-based protocol. Synchronous communication, on…
What is the difference between a battery charging USB port and a standard USB port?
…device. This allows them to easily power or charge CDP compliant devices. All CDPs are USB Battery Charging Specification BCv1.2 compliant, ideal for charging batteries or powering high-current USB peripherals….