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작성자꾸이꾸이 조회 0회 작성일 2022-05-14 06:58:44 댓글 0

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MAX485 module tutorial

Simple Serial over RS485 between two Arduinos.
Link to notes: https://drive.google.com/open?id=1o6QfFqyygrj3GJyXcATjZHRVr2-wHb6O
Thummasin Piyarattanatrai : This is very helpful, after watching through many clips, yours was the first which I could actually make the RS485 work!!! Big Thanks!!!!
Ronald Ronald : Hi Chris, Thanks for your clear example. I om looking for an example to daisy chain more than 2 ESP32 together but could find nothing that i liked.
Pepsiaddicto : I’m considering creating a looped network of arduinos using max485. All would need to be able to transmit a message and each one may respond to that message, but it would pass it along the network until it got back to the original sender which would verify that all in the network got it. Is this possible? I’m thinking because the sender needs a high signal and receivers low that this could create a lot of collisions with them switching a lot. Is there a better protocol you know of for this?
allan mitchell : Awesome stuff big thumbs up
Jeff Beck : a kilometer!!! Man, I could string a bunch of these together run kilometers of wire. ...to someone. ...I guess to my neighbors. I don't know what we could communicate about . We don't talk now. It could be super cool if you had a bunch of land and needed to check stuff, and hate radios. Or a building. I am not sure when you would need this, but I like it. That is a long way. Great explanation on the On/Off twisted pair noise cancellation.

What is RS485 and How it's used in Industrial Control Systems?

✅ C'mon over to https://realpars.com where you can learn PLC programming faster and easier than you ever thought possible!

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✅ Check out the full blog post over at
https://realpars.com/rs485/

What is RS232 and What is it used for? https://realpars.com/rs232/

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Today you will learn about RS 485. If you are familiar with RS232, then you may already know a little bit about it.

Just like it’s older brother RS232, RS485 is a form of serial communication. Think of RS485 as the younger, faster brother of RS232.

What made it such an advancement over RS232 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 aren’t 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.

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A special thanks to Frederico Duarte Fagundes for translating this video.

#RealPars #RS485
Rupin Chheda : The range of the bus is higher and it can support faster speeds because of Differential Signalling. The signal sent across the bus is not referenced to ground, but to each other. The difference in signal levels between the bus wires determines a 1 or a 0. Noise if present pushes both the wires up or down in the same magnitude, thereby maintaining the difference in signal levels. USB is a faster bus partly because of differential signalling.
Caffeinated insanity : Resistance to electrical noise isn't only because of cable shielding, but also thanks to the fact it uses a differential signal rather than a common ground, as with CAN bus. This also allows compensation against interference.
brencostigan : RS-485 is more accurately described as the grown up big brother of RS-422. It’s not fair to compare it directly to RS-232. The reason RS-485 still enjoys massive usage in industrial applications is due to the range of physical layer implementations. As stated in the video it supports multi-drop as opposed to just point-to-point like RS-232. However, it can be used in full or half duplex modes. This means that a station on a RS-485 bus can simultaneously transmit and receive data at the same time.
RS-485 can be transmitted over both optical and copper physical layers. The optical implementations support dual redundant optical rings which are very robust. Both optical and copper layer repeaters mean that each copper segment can be extended to then support up to 255 node addresses (0 to 254) for the overall network. The actual protocols that run over this RS-485 physical layer are also very lean and efficient in data throughput. Profibus-DP is one example, but please note that Profibus does make a number of changes to the underlying RS-485 physical layer rules (capacitance and inductance limits, etc). Profibus-DP can run up to 12Mbps. Unfortunately, RS-485 is probably the single most misunderstood transmission technique due to a lack of understanding about bus termination requirements and correct screen connections.
Dart Gar : You may need a termination resistor of 50 ohm. Avoid running the wires outside it become damaged by lightning. As a field service engineer I found that electricians are used to wire electricity a and electronic, make sure they know that black is ground and red is high in electronics. Rs485 wiring is very sensitive that way.
TUAAS : Thank you RealPars for making valuable Videos.
Sir, I have one question: what is the difference between Standard & Protocol in communication? What's the role of a Protocol in data transmission?
Looking for positive response. Thank you.

RS-232, RS-422, RS-485: What Are the Differences?

This video discusses the differences between three common serial interface standards: RS--232, RS--422, and RS--485; and the appropriate application usage for each.
Texas Instruments : Sure! Thanks for watching. Check first that the bus voltages are switching with an oscilloscope. The differential lines (A and B) should always be complementary during active data transmission. If the signal levels are changing, then use a protocol analyzer (if the protocol is a standard) to check that the message format is correct. Let us know if you have any other questions. You can also get technical help on TI's E2E network support forums on our website.
Ravi Kumar : this is one of the most useful comparison video i have seen . short crisp and to the point. :D
Hamid Djouahra : THANK YOU VERY MUCH. IT IS VERY INFORMATIVE VIDEO
Spurrya Jaggi : It was a little fast for someone with no knowledge in this topic :( Seems like good information but hard to absorb.
Sai Srikar Gollamudi : Superb video.
Thank you sir.

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