Re: FTDI FT232BM Hyperterminal Problems

From: starfire (starfire151_at_cableone.net)
Date: 02/26/05 

Date: Sat, 26 Feb 2005 08:44:00 -0700

"C Bremer" <cdbremer@gmail.com> wrote in message
news:9ec041b7.0502260348.3ad066e@posting.google.com...
> Hi. I'm working on a project where I am connecting a Garmin OEM GPS
> Receiver (asynchronous, RX-TX-GND) through the USB port in Windows XP.
> Initially I connected the GPS through COM1 and successfully received
> the data in HyperTerminal. The GPS sends data at the factory default
> of 4800, 8N1. The GPS sentence length is 55 bytes plus a LF and CR at
> the end, one sentence per second. (only the $GPGGA sentence)
>
> Now I am trying to receive the same data via the USB port using a DLP
> Design DLP-USB232M USB Adapter. I downloaded the Virtual Com Port
> (VCP) drivers and installed them. The installed drivers show up in
> the device manager as "USB Serial Port (COM4)". It is set to 4800,
> 8N1 under Properties.
>
> When I try to connect to COM4 in HyperTerminal, I only receive
> garbage. The data displayed in the HyperTerminal window does not
> resemble the data seen from the connection on COM1 and is not the same
> length.
>
> I ran "Test Application V1.0" from DLP and when connected to COM1 it
> receives 113 bytes of data at a time. When connected to COM4, 113
> bytes are also received.
>
> The DLP board is seated in a solderless breadboard.
>
> Does anybody know what might be going on?
>
> C. Bremer

When you start your HyperTerminal, click Call -> Disconnect, then click
File -> Properties then confirm you're using the com port you think you are.
Next click the Configure button and confirm the baud setting are correct for
your interface. Make sure you select None for Flow Control. Save
everything then click Call -> Call. It should be OK.

I've run through this a few times in trying to get a HyperTerminal session
working correctly. I have successfully gotten an FTDI / USB adapter to work
with the three wire serial interface to a GPS at 4800N81.

HTH

Dave

Loading