Problem with PC uart communication

[taka_taka]

rs485 to uart max487

I have a problem communicating between PC to AVR.
I got a RS485 converter that can convert from RS232 (PC) to RS485.
I can use it for PC-to-PC, but I failed using it for PC-to-AVR.
I am not sure about the sampling methodology of PC uart.
Could this be a problem since the the converter generates enable signal to the max485 that much less than the baud rate period. ?
Anyone can help?

 

[paurelian]

pc uart

I have a problem communicating between PC to AVR.
I got a RS485 converter that can convert from RS232 (PC) to RS485.
I can use it for PC-to-PC, but I failed using it for PC-to-AVR.
I am not sure about the sampling methodology of PC uart.
Could this be a problem since the the converter generates enable signal to the max485 that much less than the baud rate period. ?
Anyone can help?

for connecting to AVR you need a converter from RS485 to UART (e.q. max487). I am using this type of communication and it's working fine. From PC i have an USB to RS485 converter and on my board i have an RS485 to UART converter (using max487). It has nothing to do with the sampling methodology! One thing to note it: when you sending one character from UART to PC via RS485 be sure that you are keeping transmission enable as long as this byte is transmitted (by checking TXC flag)

Aurelian