Modscan64 Download Crack
Kristeen Cheek
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. I am currently using Modbus poll to read the data that is being transmitted from the Arduino but i am having some errors.
I am using some example code found online which incorporates the ModbusMaster.h library in order to send data to a holding register. 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 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 have digital inputs connected to the DE & RE Pins on the Rs 485 and the Arduino RX & TX connected to DI & RO. I then have the A+ and B- connected to the respective terminals on the Rs485 IC to the SH-U10 USB converter.
The Arduino IDE serial monitor also show's 3-4 square boxes and a weird character, not the information expected to be transmitted. 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. Any help would be gratefully appreciated and Thankyou in advance!
Hi Yago, thanks for the reply. I am attempting to use function 06 write single register and write a single bit 1 to that register. I have just uploaded some pictures of the setup and the errors that i am receiving. I am not sure if i am sending the data correctly through the code
But, you may not get the expected output on the Arduino Serial Monitor if your Modbus data is being sent at an oddball speed (i.e. something other than 2400, 4800, 9600 etc). That might explain your strange characters.
Hmm, I don't have any modbus capable equipment here so i'm not sure. I downloaded the tester and it doesn't look like the one shown in your "modbus tester.png" file. Maybe when you have a real bus connected up, and hit read, then you end up with the screen you see.
Hello Mark, i couldn't find the download link for that tester. After doing some research i came across the modscan64 software. I have reconnected my project and i am still receiving the same errors. When i try to write
Whilst system is idle i get " Modbus Message "TIME-OUT" " and when i press my discrete input to send the above data i receive "checksum error in response message" I have posted a picture to these errors above under modscan64 "timeout" & modscan64 "checksum error"
I just checked and it's there. If you follow the link I gave you, you should end up on the Schneider Electric web site in the Browse FAQs section with a subject of "Video: What is Modbus Tester and how do I use it?".
Okay thanks for the explanation, i found the program and downloaded. Typed the settings in and attempted to read the modbus through COM3. I then got a CRC error which can be seen in the CRC error.png i just posted, maybe this will shed a little light on the situation? Am i just not sending the data correctly?
I have also just added a screen caption of the wiring diagram, i'm sure my wiring is correct. I've rewired the project 5 times now and still receiving same errors. I have seen on other posts to do with rs 485 chip that people sometimes ground some of the pins like DI,DE etc. Could this maybe help here?
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. 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. 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. That may be why you are getting the "insufficient bytes received".
If you are still getting "insufficient bytes received", then try increasing the delay a bit. 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.
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. I've tried this up to 8ms, i also still get this compile error in the arduino IDE -
I have also added a 1ms delay into when the input is pressed and have the same results. 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".
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. 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.
From my limited knowledge, you are communicating in binary, rather than ASCII, so your message should be 8 bytes, which it is. This may also explain why the Arduino IDE serial monitor "show's 3-4 square boxes and a weird character".
Just another thought whilst it's in my mind: that address you are using 0x40001 - I'm going to hazard a guess that it is an address shown in the Modbus Tester screenshot you provided. It looks like those addresses are in decimal so if you want to use address 40001, then that's 0x9C41 in your writeSingleRegister() function.
Okay so i changed the address to "node.writeSingleRegister(40001, 1);" and the compile error disappeared great! One step closer, i downloaded Hercules and pressed the input 3 times on COM3 to see the serial data which is strange characters i think this is to be expected as have read in places it's hard to intercept the actual serial data. I have posted a screenshot of this in the original post, i tested Modbuspoll again and i'm unfortunately still receiving the errors "timeout error" and when the input is pressed, "insufficient bytes received".
The communication traffic has changed, it now looks like it is writing to the address 9C 41 which as you stated above translates to 40001 as opposed to 00 01 address in the previous communication snapshot.
I had a quick look at modbuspoll and I don't think it's what you want to be using. The docs imply that it is a modbus master simulator designed to help develop slave devices. If that's the case, then it sort of makes sense that it would want to do the talking and expect a response from a slave device - maybe the reason for your timeout message.
Your scenario seems to be the opposite in that your arduino is the master and you want the pc to be the slave. If that's the case, then there's a free modbus slave simulator that might be of use. You can find it here.
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While there is no groov Manage API access to the 4 port groov EPIC Serial Communication Module (yet - and if you need it, please please let me know!), Node-RED talks to the module just fine. Here is how to get started.
It is as simple as it looks to get started.
Drag the input (receive) node over. Add a new serial port, see this forum post here for more information on their names.
Configure the baud rate, stop bits and parity.
IMPORTANT EDIT. I have found that if you run Node-RED and PAC Control with serial commands addressing the same serial port, you get undesired results. So in short, pick one method and stick with it.
" IMPORTANT EDIT. I have found that if you run Node-RED and PAC Control with serial commands addressing the same serial port, you get undesired results. So in short, pick one method and stick with it."
If all those Modbus nodes are using the same serial port then that is likely a problem. Node-red will operate asynchronously, so multiple nodes will try to write/read on the serial port at the same time.
I have ruled out PAC conflicts for this flow, but had them in another flow (controlling a PDU). I was hoping it was the serial port I left open in PAC (com handle), but I do believe it is the limitations of this node.
Then use import serial at the top of your script. Further documentation of how to connect to a device and send / receive data can be found on the pySerial page: pyserial.readthedocs.io/en/latest/shortintro
Two more things to keep in mind are that first, you must run your script as sudo, since the path to your serial device will be /dev/ttyUSB0 through /dev/ttyUSB3, which is pathed for the dev user, not the shell user. Secondly, you cannot run the script while the serial device is communicating with another service like Node-RED.
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