[Visual Basic] Explore Modbus Protocol Techniques and Checksum Calculation in VB

Hello! Does anyone have examples of transmission with the MODBUS protocol under vb?
I mean specifically the method of calculating the checksum and releasing the data to com. Thank you in advance!

PS I'm just "trying" to learn vb :D

I close. - arnoldziq

What MODBUS version do you want to use. If ASCI is a checksum then exor of all bytes and if RTU is the sum of CRC16. Unfortunately, I do not know VB.

I really care about RTU. How do you calculate the checksum anyway?

As for the sum of crc16 see here:
https://www.elektroda.pl/rtvforum/topic99019.html

Modbus rtu is generally not that difficult / it was finally built well 20 years ago /. You must detect silence in the program for more than 3.5 times the time of a single character as a start condition and then take the characters one by one. After receiving the whole frame, count the crc16 frames - the last 2 characters / that is the sum of crc16 sent by the master / and then compare it with the sent.
I have a program somewhere that I once downloaded from the net for the purpose of testing a device of my design with the Modbus RTU protocol. Shows the structure of the transferred frame and the answer obtained. As soon as I find him, I will send it.

greetings

I will be oooooooo very grateful. (I am anyway )

This is the app I mentioned above. Great for testing.
greetings

Thanks a lot. tomorrow I'll be up to speed