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meki_2118 wrote: I must first study how the serial port work. Am I right?
yes.
whatever it is you will be using, you must study it.
meki_2118 wrote: the "number of line" your talking about I'm really clueless
each serial port offers a few output lines and a few input lines.
you must determine how many you need for your target hardware; if the port has fewer,
it won't help you.
meki_2118 wrote: I'm planning to experiment it first with a LED light
That is good. An LED will take some 10 mA and it sure needs a series resistor (say 1K).
When it works, it shows your software is probably OK. But that might be the smaller
part of the job.
Before you implement something, you should:
1. study the technologies you are considering;
2. make a design.
In your case: check number of lines, voltage levels, current requirements.
Example: if your door lock needs 1 Amp to operate, the serial or parallel port will not
be capable of supplying that, hence you would then need a power supply, a relay, and
probably a transistor to control the relay. (A relay probably will need more than a
few volts, and being inductive, I would not connect it to a PC directly).
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hi. I've already studied how the serial port work and I already looked at the device I going to use. I think that I'm going to use two lines of the serial port. And my device will work like an florescent light, it is powered by a 220 volts. And the logic here is that my pc will only command the lock to turn on and off. But I don't know what pin to use and will I be still needing a transformer to change the voltage that will run through my pc?
Happy New Year
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Hi,
IIRC the pins DTR and RTS are output pins on the PC's serial port. They are controlled
by the properties SerialPort.DtrEnable and SerialPort.RtsEnable.
RS232C pins carry a DC voltage, anywhere in the range (-15V,+15V). They are capable
of sourcing/sinking some 10 mA and not suited for larger currents, larger voltages, or
direct connection to devices that are powered by the AC mains.
If your door lock is powered by 220V AC mains directly, you will need galvanic isolation
(you can't connect mains to your PC!); it also will need more than 10mA so you need
some switching device, either a transistor/thyristor/triac or a relay, and probably
both. It somewhat depends on the specs of the lock (see documentation!), and the distance
between PC and lock.
[ADDED] Instead of a transistor you could use an opto-coupler, which together with a
relay would be able to control almost anything; the transmitter side of the opto-coupler
would very much ressemble an LED, making your initial LED experiment much more
relevant.[/ADDED]
modified on Friday, January 04, 2008 7:40:49 AM
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i want to create an application server-cliente i found this page
http://elguille.info/colabora/puntoNET/PabloTilli_SocketsVBNET.htm
this article say i have to create two .dll file`s and then a file to run the application, could you help me or do you know a page where i can see a example, thank`s.
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Hello,
It is possible to get access with different user to one Access mdb file without SQL Server.
I have a small application (5 user) and I need access in a small network to one mdb file .
Is that posible ?
If yes, how can I do this without to get troubles or data crash.
I use VB Studio 2005.
Thanks in advance
BR
Stephan
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You could use an Access database to do this, though Access was not designed for a multiuser environment. You WILL have to do maintenance on the database and Compact and Repair it every now and again. You WILL eventually have problems with the database.
If you want less problems and more flexibility, go with an SQL Server version, such Sql Server Express (free!).
Since Access is a file-based database, every user will have to have access rights to the file share and folder on the server where the database will be stored. I hope you know what you're doing when it comes to Windows Networking. If you don't, then you better learn before you start this project. You WILL need to know this stuff.
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Hello,
I have a function ConnectTo in a class clsMakeConnection.
My code is:
Dim MyCon as new clsMakeConnection()
MyCon.ConnectTo(...)
I would like to get a list of the possible connections.
I mean the list that you get when for example you write:
Dim c as color=
and then you get a list of all the colors as following
Color.AliceBlue
Color.Blue
Color.White
...
Is it possible to do that?
Thank you
Shay Noy
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There's several ways of doing this. The most basic is creating an Enum to provide this list of options. But, in all cases, it isn't magically created for you.
Public Enum ConnectionOptions As Integer
SomeOption = someIntegerValue
SomeOtherOption = someOtherIntegerValue
... and so on for each option ...
End Enum
Then, in your method signature of your Connection class:
Public Class clsMakeConnection
Public Function ConnectTo(ByVal connectionType As ConnectionOptions) As ...
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Is it possible in addition to set a tooltip for each one of the items?
Someone can help?
Shay Noy
modified on Thursday, December 20, 2007 4:49:26 AM
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Hello, everyone
I am using VB.NET 2005 to create a project try to monite the PLC device. This project need to send a ASCII string to PLC link <enq>00FFBRAM00001422. I create this string in my program and using SerialPort object to control RS-232 port. I wrote the following code
RS232PORT = NEW system.io.pORT ( "COM6" , 9600 , ....)
RS232PORT.OPEN()...........................This stament execute sucessfull , means RS232port define is ok,
.....
mStr1 = chr(05) & "00FFBRAM00001422"
RS232PORT.WRITE( mstr1 )
and I found the RS-232 port flesh and PLC recive LED also flesh one. But PLC return with nothing. I got another utility and open another com port said COM3, and have null modem connected COM3 & COM6 and RS-232 test utility shows it got a data with 63 5 63 30 63 30 63 46 63 46..... it seems a x63 was added for each character, I wounder why ?
I check the menu say , SerialPort object default use encoding.ASCII format to send data , but why the result seems not,
following is my serial port object setting
? rs232port
{System.IO.Ports.SerialPort}
BaseStream: {System.IO.Ports.SerialStream}
BaudRate: 9600
BreakState: False
BytesToRead: 0
BytesToWrite: 0
CDHolding: False
Container: {System.ComponentModel.Container}
CtsHolding: False
DataBits: 7
DiscardNull: False
DsrHolding: False
DtrEnable: False
Encoding: {System.Text.ASCIIEncoding}
Handshake: None {0}
InfiniteTimeout: -1
IsOpen: True
NewLine: "
"
Parity: Odd {1}
ParityReplace: 63
PortName: "COM6"
ReadBufferSize: 4096
ReadTimeout: -1
ReceivedBytesThreshold: 1
RtsEnable: False
Site: {System.ComponentModel.Container.Site}
StopBits: One {1}
WriteBufferSize: 2048
WriteTimeout: -1
can anyone know where I should change to send data string to PLC normally.
Best regards
Robert
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Hi Robert,
my personal experience with SerialPort is limited to byte[] communication, I haven't sent
strings yet. But you are not the first to ask similar questions here, from earlier posts
I have got the impression setting the Encoding explicitly once again, maybe after opening
the port, could be useful.
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Hi all,
I am using a picturebox and i am loading Image by means of
PictureBox1.Image=image.FromFile("filepath and name")
if i want to remove the picture using fso.DeleteFile(paths, True) function. i cant able to delete. it show Access Denied error.
Can you give any idea to solve i,e. remove the image from the picture box after it load by using some delte method???
Thanks in advance
Senthil S
Software Engineer
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Senthil S wrote: I am using a picturebox and i am loading Image by means of
PictureBox1.Image=image.FromFile("filepath and name")
if i want to remove the picture using fso.DeleteFile(paths, True) function. i cant able to delete. it show Access Denied error.
Can you give any idea to solve i,e. remove the image from the picture box after it load by using some delte method???
Using FromFile will not let you delete the file... try some other method of loading the picture into your picture box.
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You need to load the image, make a copy and dispose of the original. That's a bug in GDI+
Why would you delete it while the picturebox is trying to show it tho ?
Christian Graus - Microsoft MVP - C++
"also I don't think "TranslateOneToTwoBillion OneHundredAndFortySevenMillion FourHundredAndEightyThreeThousand SixHundredAndFortySeven()" is a very good choice for a function name" - SpacixOne ( offering help to someone who really needed it ) ( spaces added for the benefit of people running at < 1280x1024 )
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I feel a PictureBox.CreateGraphics and an Image.Save coming up. DId you have to ask? 
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hi guys
unverifiable code failed policy check,(exception from hresult : 0x80131402)
any one knows any solution about this error ,,
thanks in advance
hello
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hi
here is your help
http://www.groupsrv.com/dotnet/about224229.html[^]
Hope it helps
Vuyiswa Maseko,
Sorrow is Better than Laughter, it may Sadden your Face, but It sharpens your Understanding
VB.NET/SQL7/2000/2005
http://vuyiswamb.007ihost.com
http://Ecadre.007ihost.com
vuyiswam@tshwane.gov.za
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How Can I Take A Chart Which Is Drawn In MsExcel 2003 To Visual Basic 6.0
Please Reply As Soon as Possible..
Manoj
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Member 4720591 wrote: How Can I Take A Chart Which Is Drawn In MsExcel 2003 To Visual Basic 6.0
I think you can include a reference to Excel workbooks in your project and work with the file... Why would you be doing this in VB6 anyway?
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why does posting a 'vb6' questions a big deal?
while this is still a Visual Basic Forum..
i never really like this... being a programmer...whhargghh!!
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anthoy wrote: why does posting a 'vb6' questions a big deal?
Because VB6 is dead and Microsoft has not supported it since March 2005.
anthoy wrote: this is still a Visual Basic Forum..
True, but it is mostly VB.NET now.
"Real programmers just throw a bunch of 1s and 0s at the computer to see what sticks" - Pete O'Hanlon
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Member 4720591 wrote: How Can I Take A Chart Which Is Drawn In MsExcel 2003 To Visual Basic 6.0
(1) Please don't shout!
(2) You can use the same ActiveX component Ms Excel uses, i.e. Ms Chart.
If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.
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Why are you still using VB6? Microsoft stopped supporting it almost 3 years ago.
"Real programmers just throw a bunch of 1s and 0s at the computer to see what sticks" - Pete O'Hanlon
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Please help me...
in above question..
Thanks..
T@SU
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