Trame modbus rtu
And then you use " list1.AddItem Asc(Mid$(strBuffer, intI, 1))" to again break it in individual elements. Its true that you concatenate the buffer every time you receive something.
Trame modbus rtu code#
I will try the code and post the Doogle- I really liked the structure and the explicitness of your codeīut I am a bit confused. And the part with declaring the variables is worth testing. Thanks to you two for a quick Richard- Thanks n ya you are right that may be its better that i use the binary mode from now on since at the end with the robot, i will have to deal with the binary data. Even Tried the binary mode someone suggested but I never got all the elements of the TRAME.
I have read a lot of posts on this thread and tried a lot of things. Received.Text = "Reception in Progress and Count :" & count2Īnd this is the configuration of all parameters of MSComm in the receiver Program : Private Sub Timer1_Timer() ''''Interval = 2000msĪnd this is the configuration of all parameters of MSComm in the sender Program :Ĭount2 = count2 + 1 '''' To see for each trame received t'OnComm' executes how many times If you need any more details let me know ))) And as obvious from the output, the variable 'count2' is incremented by 3 every second.Ĭan someone please help me out in receiving all the elements because i have been pulling out my hair since last 2 weeks and i am badly stuck ? And it has been a week since i have been playing around with the parameters of MSComm control and no matter out what i do, i always receive something out of these 3 elements. But what all i receive in the listbox is three elements of TRAME every second : "1", "9" and"17" as mentioned at the end of this post in the section OUTPUT. And 'OnComm' should be fired 20 times for each trame as 'RThreshold=1'. Normally as SThreshold and Rthreshold at both the ends are "1", an 'OnComm' event should be executed at the reception end for each character in TRAME and there should be 20 elements in the list box for one TRAME.
Trame modbus rtu Pc#
So on the other PC i have another program which tries to read each part of this trame and display it a list Box. Now the part I want to learn is the reception of this TRAME. Here I do nothing but send the same TRAME every second in a timer.
Trame modbus rtu serial#
So for the time being I connected two PC's with a serial cable.I wrote a VB program for sending a TRAME (Format as in program below).
The actual frame will be in the RTU Modbus format with CRC check at the end.īut before starting on the robot (Which will repond in the same format), I wanted to simulate the process (in a simpler version) on two PC's. But the one in the program is just an example. Well I am working on a project where we need to send a robot a demand for reading an address in form of a Frame(Trame) as given in the program below.