. Today, you will learn about RS 485.. If you are familiar with RS 232, then you may already know a little bit about it., If not check out our other video. What is RS 232.? The link will be provided below. Before we get into todays video. If you love our videos, be sure to click the like button below and make sure to click subscribe and the bell to receive notifications of new RealPars videos.. This way you never miss another one. Just like its older brother, RS, 232 RS 485 is a form of serial communication., Think of RS 485 as the younger faster brother of RS232.. What made it such an advancement over RS 232 was the fact that it could transmit not only a single device to device transmission, but also a communications bus to connect multiple devices at once.. The configuration and specifications of RS 485 make it faster and extend the range of data transmission. You arent limited to fifty feet of cable like with RS 232.. The maximum cable length for RS 485 is typically listed as 1200 meters or about 4000 feet.. Much like RS, 232 RS 485 doesnt have an actual standard connector. Many times the old DB 9 connector is used. In some applications. Terminal strips were used in place of a connector.. This helped RS 485 become a widely used and very versatile form of serial communication.. Another advantage over RS 232 that I mentioned earlier is the number of connectable devices.
RS 485 can handle up to 32 connected devices. RS232 could only handle one.. This allowed users in manufacturing facilities to connect larger applications and whole machines with one protocol. Another plus for RS 485, is that it is less susceptible to noise. Issues.. Electric noise can cause all kinds of problems for electronics. RS 232 referenced ground to decipher the data. It was transmitting. This allowed for electrical noise to cause interference.. Rs 485 avoids this issue, which also allows for shielding of the cables to prevent noise.. You may be wondering what can I do with serial communications, especially RS 485.. One very common example in the automation world is remote control of VFDs or Variable Frequency. Drives. Many people just call them motor drives., A simple network of a PLC VFD and an HMI allows remote control of motors. In an industrial setting. Lets, say you were monitoring a water pump, filling a vessel.. You decide that the water is not filling fast enough to keep up with demand.. With your RS 485 network, you can remotely monitor and control that pump from a control center.. This is possible since the HMI is connected to your PLC via RS 485.. The PLC is also connected to the VFD via RS 485.. The PLC is programmed to monitor the level of the water in the vessel.. It also allows manual flow control if needed.. All of this allows you to speed up the VFD that controls the speed of that water pump.
Problem solved thanks to RS 485 communications. Let’s talk about what we now know about: RS 485.. It is faster and much more versatile than the older RS. 232. Users. Can utilize a longer cable up to 1200 meters or 4000 feet.? The greatest feature of RS 485 is the fact that you can connect up to 32 devices on one system.. Rs 232 could only handle one at a time.. There is no standard connector for the protocol.. Most manufacturers still utilize a DB 9 connector.. You can also still simply use a terminal strip.. This makes utilizing RS 485 simple.. All in all, RS 485 really allowed full automation possible with its ability to connect so many devices at once.. I truly hope this video was helpful.. Please dont forget to check back later for more RealPars videos, Make sure that you head over to realpars.com. To find even more training material for all of your PLC. Programing needs.. We offer many videos to assist you in learning PLC. Programing and landing that job in a high paying highly thought after field of automation and controls, engineering. Go to realpars.
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