Solved

Serial Port

Posted on 2001-08-08
7
410 Views
Last Modified: 2010-04-06
I know Delphi isn't designed for creating device drivers but I think I can use it to send data to a serial port.  

1) Is this done with basic Delphi commands or is it a WinAPI type command?

2) Is there a resource online that will teach me the essentials?


Note: I am going to receive a box that attaches to the serial port.  I need to be able to send a string of ascii characters and read a response.

Thanks in advance for your assistance.
Don
0
Comment
Question by:d32coder
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
7 Comments
 
LVL 7

Accepted Solution

by:
Motaz earned 100 total points
ID: 6366917
I use a free open source component called Async, I use it for all my serial interfaces, tell me your E-Mail and I'll send it to you.

Motaz
0
 
LVL 22

Expert Comment

by:Mohammed Nasman
ID: 6366928
0
 

Author Comment

by:d32coder
ID: 6367483
Thanks Motaz: d32coder@home.com  

mnasman, Looking at your URL's now.


Don
0
Industry Leaders: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

 
LVL 3

Expert Comment

by:VSF
ID: 6368353
Sent some nice components to you via e-mail <d32coder@home.com>!
Hope they help you!


VSF
0
 
LVL 17

Expert Comment

by:inthe
ID: 6368485
hi,
just to mention that while the components above certainly make life easier ,they are wrapper for using the WinApi .
Api's like :
CreateFile()
ReadFile()
WriteFile()
Get/SetCommState()

etc are the ones mainly used.

below is example to initilize modem on Com4:

 var
  ComFile : THandle;
  TimeOuts: TCommTimeouts;
  DCB: TDCB;
  ReadBuff: array[0..100] of char;
  NumBytes: DWord;
 begin
  ComFile := CreateFile(PChar('COM4'),GENERIC_READ +
GENERIC_WRITE,0,nil,OPEN_EXISTING,FILE_FLAG_WRITE_THROUGH,0);
    if ComFile = INVALID_HANDLE_VALUE then
    begin
     ShowMessage('Unable to open COM4');
     exit;
    end;
    TimeOuts.ReadIntervalTimeout        := 100;
    TimeOuts.ReadTotalTimeoutMultiplier  := 100;
    TimeOuts.ReadTotalTimeoutConstant    := 0;
    TimeOuts.WriteTotalTimeoutMultiplier := 0;
    TimeOuts.WriteTotalTimeoutConstant  := 0;
    SetCommTimeOuts(ComFile,TimeOuts);
    GetCommState(ComFile,DCB);
    DCB.BaudRate := 5600;
    DCB.ByteSize := 7;
    DCB.StopBits := ONESTOPBIT;
    DCB.Parity  := EVENPARITY;
    SetCommState(ComFile,DCB);
    ReadBuff := '';
    StrPCopy(ReadBuff,'ATZ' + #13 + #10);
    WriteFile(ComFile,ReadBuff,Length(ReadBuff),NumBytes,NIL);
    ReadBuff := '';
    ReadFile(ComFile,ReadBuff,100,NumBytes,NIL);
    CloseHandle(ComFile);
end;

nice to know how things are done but i would still get and use some of the components mentioned above to save much time.

Regards Barry
0
 
LVL 5

Expert Comment

by:Gwena
ID: 6370261
listening :-)
0
 

Author Comment

by:d32coder
ID: 6370293
I honestly didn't expect so many responses so quickly.  I should receive the box UPS in the next day or so.  I'll report on it (and choose an answer) as soon as I get it connected.

Note: Please do not send me "cracked" components.  I'm in the software business and do not appreciate piracy.

Don
0

Featured Post

Enroll in June's Course of the Month

June's Course of the Month is now available! Every 10 seconds, a consumer gets hit with ransomware. Refresh your knowledge of ransomware best practices by enrolling in this month's complimentary course for Premium Members, Team Accounts, and Qualified Experts.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

This article explains how to create forms/units independent of other forms/units object names in a delphi project. Have you ever created a form for user input in a Delphi project and then had the need to have that same form in a other Delphi proj…
Objective: - This article will help user in how to convert their numeric value become words. How to use 1. You can copy this code in your Unit as function 2. than you can perform your function by type this code The Code   (CODE) The Im…
Monitoring a network: why having a policy is the best policy? Michael Kulchisky, MCSE, MCSA, MCP, VTSP, VSP, CCSP outlines the enormous benefits of having a policy-based approach when monitoring medium and large networks. Software utilized in this v…
Do you want to know how to make a graph with Microsoft Access? First, create a query with the data for the chart. Then make a blank form and add a chart control. This video also shows how to change what data is displayed on the graph as well as form…

717 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question