Building management control system comprises of numerous Recommended Standards (RS) protocols. Different control loops are required for the management and regulation of various modules in a control system. Each loop might have corresponding codes and protocols.
Serial communication of binary bytes requires the mentioned protocols. RS-232 was one of the most widely used communication protocols. But the new era of RS protocols dominates the industrial sector with promising features and reliability. Let us have a look at the promising protocols of automation industry.
Is RS-232 history these days?
Modules for serial communication once predominantly used RS-232. It was one of the commonly used standards for personal computing devices such as modems, printers, projectors etc. They find applications still in the industry. But some of its technical drawbacks limit their application in the new aged automated control systems.
The major drawback of RS-232 is its range of signal transmission. The difference between two devices employing RS-232 protocol cannot exceed 15 meters for a successful data transmission. This distance limitation also results in voltage swing, noise, and data losses. The minimal speed of data transmission also slows down the application of this protocol.
Is RS-485 a better option?
The limitations of RS-232 can be overcome by the usage of RS-485. In that case, it is surely a better option. One of the major features is its range of signal transmission. It ranges from meters to kilometres. So this standard is suitable for long distance transmission of data.
It is very suitable for multipoint connections and can avoid a messy network of signal lines. The speed of data transmission is 10 megabytes per second and also it has the ability to detect voltage signals as low as 200 millivolts. 232 has full duplex mode of transmission whereas 485 is half duplex. All these features enable reliable data transmission than RS-232.
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