Issue with RS485-Arduino-PC communication via Ethernet

Hi,

This my project set up.
PC<–>USB to RS485 converter<–>RS485 shield mounted on Arduino Ethernet shield<—>PC.
I am trying to enter some characters on the RS485 serial port monitor and display that data on the webserver and vice versa.
So basically,

if(RS485.available)
{data=Serial.read();
client.write(data);
Serial.write(data);
}

The issue is when i connect the RS485 shield,I am not able to display the data on webserver. Any suggestions about this is welcome.

RS485 shield mounted on Arduino Ethernet shield

Are these shields compatible to be stacked in this way?

yes.They are.I am able to send data from the html to the RS485 shield.