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This is rather stressful as i have a project that's in soon and i have everything in front of me ready to work but the flipping data communication is not playing ball.With the Modbus RTU protocol, the start of a message begins with the first byte sent after a minimum silent interval (i.e. It still feels like something is conflicting with the data being sent, maybe it could be the way i am sending the actual data by printing to 06 single write register but i'm sure i have seen online that this works with other people.
MODBUS POLL TROUBLESHOOTING SOFTWARE
When the code uploads to the arduino, the mbuspoll software when connected to the device instantly says " Timeout Error" whilst the code is idling and when the input is pressed i occasionally get "Checksum Error" but often "Insufficient Bytes received". I have also added a 1ms delay into when the input is pressed and have the same results. "warning: large integer implicitly truncated to unsigned type I've tried this up to 8ms, i also still get this compile error in the arduino IDE. Okay so i added a delay into the post transmission of 2ms which in my IDE is (2000) and i still received insufficient bytes received, i kept moving it up 1ms a time and still received the same error. You don't want to make the delay too big or you may get a bus conflict with 2 devices transmitting at the same time. If you are still getting "insufficient bytes received", then try increasing the delay a bit. 11 bits) takes about 11x 104us = 1.1ms to get all the bits clocked out. You're running at 9600 baud so one byte + start bit + parity bit + stop bit (i.e. That should insert a 2ms delay into your code before turning off the transmit driver.
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To something like: void postTransmission() I had a quick look at the code of Modbusmaster on github and it looks like it's down to the user to implement the delay.
MODBUS POLL TROUBLESHOOTING SERIAL
I would try introducing a small delay between writing to the serial and setting DE low. That may be why you are getting the "insufficient bytes received". If you set DE low too quickly, you end up cutting off part of the last byte when you turn off the MAX485 transmit driver. Once you've written the final byte to your serial hardware, you need to allow a bit of time for the byte to actually get out the UART Tx buffer before you set DE low. My first thought, and it's quite a common gotcha with this type of setup, is that you may well be setting DE low too quickly. I was about to try and lead you through a step by step fault finding process but then I re-read your original post. Node.preTransmission(preTransmission) //Callback for configuring RS-485 Transreceiver correctly PinMode(MAX485_DE, OUTPUT) //declaring pinmode output for max485ĭigitalWrite(MAX485_RE_NEG, 0) //initialise PinMode(MAX485_RE_NEG, OUTPUT) //declaring pinmode output for max485 Any help would be gratefully appreciated and Thankyou in advance! I am quite frankly not sure what is going wrong here as the code is identical to the example and people have been able to get that working fine, it just seems like my byte data being trasmitted isn’t correct. The Arduino IDE serial monitor also show’s 3-4 square boxes and a weird character, not the information expected to be transmitted. I open modbus poll to see if the data has been transmitted correctly i get an error when i push the button, the LCD prints S1: High but modbus poll shows
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My problem feels like it is within the software side of the project, when i compile my code which isn’t much different from the example code i found online, i am receiving an error warning: large integer implicitly truncated to unsigned type īut the code still compiles and let’s me upload to Arduino device. I then have the A+ and B- connected to the respective terminals on the Rs485 IC to the SH-U10 USB converter. I have digital inputs connected to the DE & RE Pins on the Rs 485 and the Arduino RX & TX connected to DI & RO. I am confident that my hardware is configured in the right way as i am seeing expected results when pressing the push button (writes to LCD correctly & Modbuspoll receives some kind of data). I want to send a binary 1 to the register from the Arduino in order to use this as a trigger in my software. I am using some example code found online which incorporates the ModbusMaster.h library in order to send data to a holding register.
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I am currently using Modbus poll to read the data that is being transmitted from the Arduino but i am having some errors. Hello i really need some help, i am trying to send some simple data from an Arduino acting as a master to some software acting as the slave.