FTDI FT232BM Hyperterminal Problems

From: C Bremer (cdbremer_at_gmail.com)
Date: 02/26/05 

Date: 26 Feb 2005 03:48:02 -0800

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

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