I am encountering a problem of data mismatch in RS485 Communication, PC side i am using the below USB-RS485 converter
USB to RS485 Converter Module - leetechbd
The data i am transmitting using the controller is

uint8_t tx_buff[20]={65,66,67,68,69,70,71,72,73,74}; //ABCDEFGHIJ in ASCII code

but i am receiving the data of

using coolterm software. On the controller side i use the RS485 transceiver SN65HVD08D. The baud rate is 9600 which i confirmed. I connected A -> A, B -> B and Gnd -> Gnd. If DE / REN is not proper can this issue happen? I have not yet tapped the signals using Oscilloscope. Please guide to solve the issue.

 

It helps to look at the signals on an oscilloscope.

 

I reverified the hardware there is mistake in the A and B signal tapping, luckily i had the option to interchange the signals, now it receives data as per expectation. Sorry, In future i try to verify all the hardware signals before posting, sorry for confusion and thank you for the time.

 

I forgot to tell you that the labelling of A and B is not consistent. I am happy that you found that out on your own.