Where can I see how much RAM uses Arduino Uno?
So i did not do this with the print-Command i.e. Serial.print("lalalalala"). And not with the line " Serial.println(Mb.remSlaveIP);" because it doesn´t work.
Hello together,I´ve been trying for several days to establish a Modbus connection to get values from my wood heating system. https://www.eta.co.at/produkte/produktuebersicht/stueckholz/eta-sh-20-bis-60-kw/My Hardware:Arduino Uno R3Arduino Ethernet ShieldMy Software:Arduino 1.0.5My Library:http://myarduinoprojects.com/modbus.html /example.zip /MgsModbus_test_MasterI try to get information (temperature exhaust, temperatur outdoor, percentage heating puffer) with Function Code 0x03 (Read Holding Register) from Start Adress 1000, 6 Registers, so I need the value from Register 1000,1001,1002,1003,1004,1005,1006.But it doesn´t work. I can´t get the data form holding registers Ethernet/TCP Connection from Arduino 192.168.178.12 / 255.255.255.0 to Modbus slave wood heating system 192.168.178.54 / 255.255.255.0 works.What´s my mistake?
Which software do you use for Modbus master simulator? I ask for software that I see in Modbus_Daten.png.
I am using a MgsModbus library.
We are using QModBus, it supports ModBus TCP as well as ModBus RTU.Did you read the thread? You might have noticed that this library is unfinished and not usable the way it currently is. So be prepared to invest quite a bit of work if you want to get your project running using that library.
I am trying a comunication Modbus with my PLC arduino based on arduino mega, and I want to read a holding registers of Victron Energy inverter
riken wrote:Which implies you will be wanting to use a library for your Arduino that offers Modbus master mode. Beware the library you pointed to above at reply #19 appears to only offer slave mode._____________Paul - VK7KPA
Hello pylon,I´m very busy at the moment. Sorry.I use Arduino IDE version 1.0.5.I think, I have to update because ARDUINO 1.8.1 is the latest version. :-oI will do it. So i hope it is possible to do the Serial.print(F("lalalalala")); change. In 1.0.5 it is not possible.Hello riken,yes I use qModMaster.exe. Did you get it?It´s important that your Arduino mega act as a master. The master can get the holding register data from your slave (Victron Energy) with the function 03 (reading holding register).Thanks in advance for your help.We will fix it :-D
I don't know that I need to implement my arduino as a master. I think that I can choose the mode.
If I don't find a library with Modbus TCP master, I will do my project with modbus RTU master.
riken wrote: I do know you will need to use Arduino as Modbus master if you wish to succeed in communicating to any slave device such as a Victron inverter. I don't know of any inverter or solar charge controller that will act as Modbus master, they all act as Modbus slaves.___________Paul VK7KPA
As far as I found information on the Internet Victron doesn't support ModBus RTU (physical interface is an RS-485) but only ModBus TCP.
I have no idea what model inverter is being talked about, just that it is a Victron brand, so we have no idea what communication interfaces are available, either inbuilt or via any purchased accessories.I believe Victron inverters use their own VE.Bus and VE.Direct propriety protocol communications system.Depending on the model of inverter, it may have a CAN bus interface that you could use.Some inverters even use a simple HTTP protocol.You could look to use the VE.Direct protocol as I believe it could be a fairly simple protocol to implement and connect to it using standard async communications, say from an Arduino, though I would suggest using a galvanic isolator.___________Paul VK7KPA
Then you need two Ethernet ports on the board, as it is not wise to have one Ethernet port communicating as Modbus TCP master as well as another TCP protocol at the same time.