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Hi Steve, thanks for the reply and help. I am using Flowcode 7, at the moment i can not use FC8. I thought it would be easy somehow to implement this conversion using C code. I have seen this post with 4 bytes but i could not figure out any result since in my case i need to use two integer values. R...

Hi Stafan, nice to hear from you. Maybe i was not describe the issue with details. In Modbus, when you define the address you read as float type, it will automatically read two addresses with one integer on each address in order to obtain the float value. For example: If you want to read the registe...

Hello to everyone ! In modbus, sometimes, we need to obtain float variables to describe a value. As i have understand so far there will be need to send two integer variables in order to describe this float variable. My question is, if i have a float variable = 24.256, how it is possible to split tha...

Hello to everyone ! I know this is an old post but lets take it a little bit further. In modbus, sometimes, we need to obtain float variables to describe a value. As i have understand so far there will be need to send two integer variables in order to describe this float variable. My question is, if...

Hi Benj,

Great job!
You gave the solution fast and sharp as always, now it is working perfect.


Thank you very much!
George

Hi, i am trying to use UART with device 16F1825 and i am getting the error below. When i remove the UART components from the project, it compiles with no errors. I would like to configure the uart so i can set the baud rate value at 1200 using C code. is there anyone how faced the same issue? Thanks...

worked fine!


Thanks Again Stefan, i hope one day i can "payback" this to all you guys.

medelec35 wrote: ↑

Tue Feb 09, 2021 8:36 pm

Hi George,
How about

Code: Select all

BAUDCONbits.BRG16=0;

?

Hi Martin and Stefan

no luck with this code, i am getting error on C code again.

Hi Stafan, thank you once again for helping me out.

I got this error after compiling with the code you provided.

I am looking the datasheet so i can familiarise myself and learn about it. Regards
George

Hi again, In my previous posts, with the help of Stefan, i manage to set the baud rate at 1200 on a 18F4680 device. I am trying to set the same baud rate value on a 16F88 device but i am getting an error for the C code. Should i use any other code than this i used for 18F device? Thanks George

Thanks to Stefan i manage to have the program working at 1200 baudrate.

The trick was to change( use grater than 1) the timeout value from UART Receive component.



I wish you all be well and health.


Regards
George

ok the compile to hex now does not returns any error. However the MCU is only sending data out(correctly at 1200 baud rate) and not receiving data .Note that i am using Rx INTerrupt to read the incoming data.

Is there anything else i have to configure to have it working ?


Thanks
George

Hi Stefan, Thanks for your help. I tried to add the C code (4 lines you mentioned) but i get an error(see attachment). Sim_Error.jpg I am using 19.660800 Mhz Crystal and i want to set the baud rate value at 1200. As far as i read in the manual i can only calculate the value of SPBRG. The formula i u...

Hi, i tried to use the lower values baud rate but it is actually not working on hardware. There should be something missing in the flowcode's background..

Hopefully someone will answer to this and solve the issue.



Regards
George

Hi all! I hope you are all well. My question is (as the title says) how to set up lower baud rate speeds than 9600(flowcode default) using C code for device 18F4680. I would like to be able to use baud rate values of 1200 , 2400 and 4800. It is not very clear to me what is the way we calculate and c...

Hi George, I was a bit confused by your flowchart. The INT0 interrupt for encoder detection is RB0. So if you look at the input within RB0 call macro you will see there is an input for E0. The input should be for RB0 instead. I'm therefore surprised the encoder works at all? Hi Martin , The encoder...

Hi It seems you are runing an motor with an encoder attched. What is the max speed of the motor ? and at what speed do you start to loose to detect encoder pulses? The encoder at the moment is not attached on the motor. The encoder movement is done by hand and the rotation speed is approximately le...

Hello all, thank you for your replies.

here is the flowchart so you can see the actual code.

Just note that the crystal speed is 19.6608 Mhz and not 20Mhz as i said in my previous post.


Waiting your comments.


Best Regards
George

Hello all! I am using an encoder with A and B signal outputs. I also use an interrupt macro for INT0 (RB0) pin of a 18F4523 microcontroller with 20Mhz external crystal. The encoder has 250 ppr. I am wondering if there is any way of capturing the encoder's pulses faster? At the moment i rotate the en...

Hello Benj, thank you for your reply. I am still trying to communicate with the Power Meter with no luck. The simulation in Proteus gives me correct results but in real hardware there is a problem in the reception of the Power Meter data. The attached File "Modbus_RTU" (Flowcode 7 Version) shows the...

Hello, i manage to request the data correctly from Power Meter.

Now the issue that i am facing is regarding the receiving data using 2 stop bits.

Is there any idea how to achieve this? I am using Rx interrupt to receive the incomming data.


Thank in advance!

George

Hello Benj, thank you for your reply. I am still confused and wondering how to receive and handle the incoming data from modbus slave. Using Modbus Poll software i managed to communicate with the slave device and get the expected data.(see pictures) The only options in flowcode for getting data thro...

Hello, i hope you are all good! I have to read a power meter (Voltage - Amperes - Watts etc.) using Modbus RTU. In order to get some level of experience and understand things better, i first installed a modbus terminal software to observe the communication structure. I understand a few things and i ...

I made a mistake when i was drawing the schematic.. I already replaced the pdf file with the correct version.


Is there any opinion about this circuit? Will this be working properly? Any idea?

Hi all, Leigh thank you for your drawing. I am working this project in my mind and to be honest i can't see the reason for not connecting each microcontroller across each battery without any isolation circuitry. The ADC of the Micro will go at the positive of each battery and the ground pin of the M...