First of all this is an urgent question my project's deadline is coming closer. Please help me

I used FT232RL chip to make USB to TTL converter. I did this connection below. I can make serial communication but I cannot receive any message. I can also send message and TX Led is lightining up.

 

Question is, what is the TXD and RXD driving? Does the USART expect TTL levels (5V) or 3.3V levels?
At 3.3V on VCCIO, your logic levels for TX and RX may be as low as 2.2V (typical 2.7V), which may not drive a true TTL load properly.
If driving a true TTL load with TXD and RXD, tie the VCCIO to VCC instead.

 

Are the Rx/Tx connections correct?

Usually, this is correct:

Tx -------> Rx

Rx <------- TX

but sometimes, trying to be helpful, some devices are labeled as where they should connect instead of what they are.

Also, baud rate, parity, data bits, and stop bits need to be in agreement on both sides. If you see garbled characters, this is the next thing to check.

 

First of all this is an urgent question my project's deadline is coming closer. Please help me

I used FT232RL chip to make USB to TTL converter. I did this connection below. I can make serial communication but I cannot receive any message. I can also send message and TX Led is lightining up.

View attachment 267747

Hi,
Compare drivers baudrate and handshake with rs232 connected device.
Look at you FTDI config data.
Check status handshake. All should be off. (rts/cts and for testing xon/xoff handshake also off)

Config tool available at ftdi

Picbuster