Hello!

I have made a rs232 terminal but have a problem with it. It generally works but when I try to send nearly any character it sends something totally diferent, or the letter gets dubbled. At first, I thought that it is a problem connected with windows but on linux the same thing happens. Please see the following pictures with settings of hyperterminal (com1, 8N1, flux control:none), and the weird behaviour:


Before I connect the disk (when I just open the com1 port) everything is fine, the right characters are send and printed out as echo.
Is there a way to fix this?
Any help would be very appreciated.
Regards

PS. I was trying to enter level 1, then leven 2, then level 3, then level T (pressed everything ONCE and just the needed symbols) and then done "zxcvbnm,./" as you can see in the last line. Tested on two diferent keyboards.
(and sorry for replying to myself but couldn't edit my post )

did u try with 2 or 3 diferrent Seagate hdd ?

is it the same ?

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Spasavanje podataka

It's even worse. I can't get the terminal to work with my 80Gb Seagate ST380011A. I've tried diferent speed settings and all I get is 2-6 weird characters just like the computer and drive couldn't sync. I've tried: 4800, 9600, 19200, 38400, 57600. The circuit is made accroding to the attached file but I used electrolytic capacitors instead of plain ones and used an ST232 chip. Could it be the reason for my problem?

I've asked a friend to look at the circuit and he found a "little" mistake - one of the pins was badly soldered. Now everything works fine and the other disk is responding to the terminal as well. Thank you for your advice!