Most likely, your computer can communicate very quickly. Simultaneously, it creates challenges for the software development teams. The speed at which computers evolve allows the data transfer rates to keep increasing without increasing the number of wires in a bundle, and this is great news for hardware designers. This creates apparent challenges as electronics become smaller and more compact.įor serial communication, faster data rates lead to more throughput. For parallel communication, more lines side-by-side in the cable can send more data.
As data streams become more complex, each method has its own way of increasing data throughput. Previously, I mentioned serial and parallel communication protocols. Limitations of Communication Protocol Speeds I have often connected to a PLC and been prompted to provide information with terms such as “baud rate” or “half- and full-duplex” while manually selecting COM ports to route the information. Most control systems contain tried-and-true communication protocols but also a bit behind the convenience of modern automatic configuration. It can be extremely costly, not to mention risky, to frequently upgrade computer systems. Industrial equipment is a little bit different. A common Allen Bradley MicroLogix 1000 uses a serial communication method, where the baud rate is selected in the RSLinx application. When you plug a new device into a spare USB port, a message appears alerting you that the computer is “installing device driver software.” After a several-second delay, the configuration is completed, and we never need to worry about it again.įigure 1. Nearly all of the devices built on modern technology handle the coordination of communication in the background of a computer. The earliest devices used serial and parallel communication ports, usually at speeds that would seem relatively slow according to modern standards.
What is a baud rate, and why does it matter?Įvery aspect of communication between digital devices is built on the trading of binary bits of information. For some equipment, however, we must supply information about baud rates. This process allows devices to send data to and from your computer, and you don’t need to worry about setting up the details-it just works. It assumes no parity and 8 data bits and one stop bit.Computers communicate by sending “bits” of digital information across wires from one device to another. The right part fo the table shows the actual transmission speed. The left portion of the table displays the speed and bit duration. The following table shows the most commonly used baud rates.
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