FTDI - DB9-USB-D3-F - MODULE

Question

Hello everybody,

have you anyone used DB9-USB-D3-F - FTDI - MODULE, USB TO UART, 1 CH, FT232R | Farnell ? I need them as USB/RS232 converters.. I have bought two modules, but I cant send any data into PC from any of them. If I connect logic analyzer to TXD pin, so I can send data from PC terminal to "logic analyzer" (so FTDI driver should be OK). But when I connect RX to TX (to make a loop), so transmitted data never come back to terminal. I have WIN7.

Thanks for any idea..

michaelkellett · Answer

I've used the cable versions often in many different projects, usually with Hyperterminal but sometimes with other software. What software are you using ? (Actually I've never tried looping one as you describe but I can't see why it wouldn't work. MK

johnbeetem · Answer

It might be a problem with dataset signals: DTR, DSR, RTS, CTS. It may be that the PC needs to have DSR asserted to accept characters. This is not that likely, because if DSR is off you probably wouldn't be able to transmit either. Since you're able to transmit that also suggests there's not a problem with RTS/CTS. Still, if there's an easy way to assert DSR and CTS I'd give it a try. For example, you might connect DTR to DSR and RTS to CTS. You should also be able to turn off handshaking in your terminal emulator. Another possibility is that the Win7 terminal emulator has received some garbage characters that have put it into a funny state. I've had good luck with putty on Win7. I've had strange behavior with Hyperterm on Windows 2000 which required restarting the program or at least resetting the link. Update : Also check your parity settings. If there's a parity mismatch your terminal emulator could be discarding input characters. Hope this helps.

FTDI - DB9-USB-D3-F - MODULE

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