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5.6

Serial Com Port Communiction RS232 Problem!

Asked by Nemesis0815 in Miscellaneous Networking, Measurement Industry

Tags: communiction, rs232

hello,

i have a problem that seems to be Windows NT specific ( maybe XP /98 too but i havent tested this yet ).

i am using a self made VB application that sends data out to a special device via the COM 1 port.

this device operates with ISO 9141 protokol. this protocol is a 1-wire only protocol, which means there´s a converter from rs232 to iso 9141 integrated into the cable. This converter causes my problem.

The Problem:

Whenever i send a message, i receive an echoed message which is exactly the one i just sent at the same time. i check this by using a special scope hardware to monitor the RS232 TX/RX signals at the com1 port. some milliseconds afterwards comes the real expected answer from the special hardware.

Now i have 2 applications with the same problem. One is my Visual basic application that receives the echo everytime .
the other one is an old Pascal programm running in DOS that also communicates with the device.

When i start this DOS program from outside winNT , in real DOS mode, i get absolutely no problems ( although the echo is still there according to the oscilloscope ). i receive correct messages.

when i start this dos program from WinNT , i get teh same problems as i have in my VB applications, meaning im getting an echo msg received everytime.

now my thought was that this has something to do with the WinNT serial Com port settings, that might differ from the native DOS settings ( if there are any at all ). maybe something like Half/ Full Duplex which is enabled/disabled in either mode. i dunno. there is no special code in the Pascal program that filters out this echo, so this must be some hardware settings that prevents data to be received when the line is busy ( like with half duplex ) i guess.

does anyone know how i can get this functionality of the com port to work in Windows NT ?( programming language doesnt matter , just help me :) )
[+][-]05/24/03 12:19 AM, ID: 8576514Accepted Solution

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About this solution

Zones: Miscellaneous Networking, Measurement Industry
Tags: communiction, rs232
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Solution Provided By: MalSood
Participating Experts: 5
Solution Grade: B
 
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