So to start with, what is rs 485 recommend it’s done that 45. It it’s a hardware communication protocol, basically it’s a specification of wiring pinout and devices which transmit and receive on that wire, so that’s. What rs 485 is in a nutshell and Modbus what’s mob boss. Well, mob boss is a software protocol which is used in in electronic communications. Modbus is used for PLC’s and lots and lots of different devices and specifically, what mob boss says: it’s it’s a set of software rules which govern how to interpret data basically and how to transmit data so where’s models used. Well, I just highlighted virtues of PLC’s, but Markus is also used on normal, well, in fact, any device – and this is one foots device. This is my solar charge controller. I can use the Modbus protocol in order to get data from this unit. So, to start with what’s what well rs 485 uses the ethernet cable or, as you might know it so if I am ever net cable and plug it in, I could transmit and receive data from the other end, of course, but with the Arduino it doesn’t need To be support, rs, 485, so what you have to do is you have to get a little converts a device like this, and this is an rs 485 to TTL, converter, board and I’m, going to wire that up to the Arduino and I’ll see the wiring in A bit but anyway so we’ve got the wiring soldered down now mob boss.
You can get a library a lot. We know library which people of very we spent the last time on, and if you have to download this library, you can basically make use of models. Therefore, make use of whatever data is available through the device which you’ve connected. So I think what I’ll do next is to show you the wiring I’ve got the Nano and I’ve got the rs 485 to TTL converter ler. Now the wiring is as follows. So you get your adalat cable if you like, or the rs 485 cable and plug it into whatever the device is, and this is gon na, be the slave device and then the other end, if you foil it right down. That goes into the converter. Now, in rs 485, I believe there are four wires how it’s used for communication I’m gon na go into the rest. What are those four wires in my particular device? Two of them identical so I’ve got two identical and another two are identical and therefore I don’t actually need to use the four pin like in these two pins. So there are any pins in the collector but I’m only going to use two pins. So, according to your documentation for your device, you’ll be able to find out which those two which two of those pins are the ones that you need to use and usually they’ll, be labeled in documentation as a and B in Fianna little as B and a so In the specification document of the device, you should be able to see that in there somewhere as well, there are ways to find it out by being fast, but anyway I won’t go into that.
So we found the a and B pin of the eight pins and then I’ve got the rest back. Okay in the pin. I was writing. Just get this to focus properly. You can see the IDE I am aha, Oh so di is driver in the e is driver, unable driver means, friends in tobacco, Ari is receiver, enable and ro is receiver out, and these go to the I is going to txd on the arduino d e is Going to ds3 on the arduino r e is going to d2 on the arduino and ro is going to t XP on the arduino okay. So next you can see over this side. There are two pins, a and B, but also at the end. You can see ground and VCC and VCC, of course, here’s the five volts and ground mr. grant and that’s pretty much it for the wire off of this little device so wandering to the United States.
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