serial port call
serial port call I want to open a serial port cash drawer connected to the client pc. I will have a record button on an asp page and when I click on it the drawer will open You'll need some way to communicate with the serial port. Web browsers typically cannot do this, so you probably want to call a program on the system. One way to do this would be with Java Server Pages - you can call a Java application using JNI to communicate with the serial port. Look online for serial communication libraries using your favorite language

Locked Serial Port on Vista
Locked Serial Port on Vista I'm working on an App that talks to a serial port, and on my development machine, I'm running Vista, and that serial port is a Bluetooth connection. Occasionally, the serial port gets caught in a state where my App can no longer connect to it. In .net I get... the port is "working properly." Is there any way to find out which process and or .dll has possession of a serial port, and/or force a port closed? If it makes any difference, my App is in C#, but structurally, it's not convenient to open and close the port with a "using" statement. Thanks, Andy To the best of my knowledge you can't close a serial port that you do not have the handle to. My experience of Bluetooth serial ports is that they can end up getting mapped to different COM port numbers at connection time, and can sometimes leave bogus COM ports when disconnected. For example, I

Error opening serial port
Error opening serial port I'm trying to open and read from a serial port using the System.IO.Ports.SerialPort class. I dragged the serial port from the tool pane (VS 2008) on to my windows form. I've got a property grid set up so I can easily change properties of the serial port at runtime. When I... connection so it's actuall a virtual serial port My settings are as follows: BaudRate = 9600 DataBits = 8 DiscardNull = false DtrEnable = false Handshake = None Parity = None ParityReplace = 63 PortName = COM3 ReadBufferSize = 4096 ReadTimeout = -1 ReceivedBytes = 1 TrsEnable = False... it has to do with the hardware or the driver malfunctioning. This doesn't explain why it works with Hyperterminal though. Follow the advice from Joseph M. Newcomer to see what Hyperterminal is doing differently. Regarding the differences between hyperterminal and the .NET serial port object

Faking an RS232 Serial Port
Faking an RS232 Serial Port I'm developing a project that has a number of hardware sensors connecting to the deployment machine through RS232 serial ports. But ... I'm developing on a machine without an physical RS232 serial ports, but I would like to make fake serial ports that I can connect to and output data from with the aim of faking input from hardware sensors. Does anyone know of a way to create a fake serial port and control it on Windows XP? If you are developing for Windows, the com0com project might be, what you are looking for. It provides pairs of virtual COM ports that are linked via a nullmodem connetion. You can then use your favorite terminal application or whatever you like to send data to one COM port and recieve from the other one

serial port parity
serial port parity Are there any known problems with using a serial port set for 8 data bits, 1 stop bit and even parity, under Windows XP? I suspect this is a case of "my code is failing and I really hope there is a problem with Windows XP." Most likely it's a case of select is broken ("this isn't working but it can't possibly be my code"). If you're having problems, post the code and the real issue so we can help you. You'll also have better luck getting links to specific issues with WinXP and the serial port (I have no idea what issues actually exist

Serial port communication
Serial port communication Hi i'm creating a windows form to send/receive data to/from serial port. At first : i send the data as string to the serial port . Second: i tried to read the string again for test the successfull transmission , but i recieved empty string this is my code : Try Dim SerialPort1 As New SerialPort("Com1",9600, Parity.None, 8, StopBits.One) SerialPort1.Open() SerialPort1.DtrEnabled=True SerialPort1.WriteLine("This is my test message ." ) ' ================= Read from serial port Label1.Text=SerialPort1.ReadExisting() ' this returns empty string Catch ex As Exception MessageBox.Show( "Error writing to serial port:" & ex.Message) Finally SerialPort1.Close() End Try i need to ask another question: is it required to connect device to serial port to send/recieve data successfully ???? please i need an urgent help thanks

reading from serial port
reading from serial port to read from serial port do i need to install some package the get support in netbeans? which packages do i need to import at the start of program? the statement: import javax.comm.*; results in error saying package does not exist...what to do You can use javax.comm package. You can download it in here. You can check an example in here

Serial Port Data Structure
Serial Port Data Structure I need to send data to a hardware device over serial port. I'm using a program called serial port tool for os x. After I connect to the device there is a form box where I can type data to send. I have no idea how to format the data. Here is an excerpt from the manual for the device. "The Net Manager Command structure consists of one start byte, one command byte, five bytes of data, and a one byte checksum. Each message packet is formatted as follows:" an example command is: Byte0=30 Byte1=7 Byte2=5 Byte3=1 Byte4=2 Byte5=0 Byte6=245 How do I type that into the form box in serial port tool? Thanks, Seth Does the "serial port tool" you're using come with any documentation? Assuming the "form box" is expecting printable characters, what you're looking for is a way to input an arbitrary byte value. For example, there might be a mechanism that lets you

Qt and serial port programming
Qt and serial port programming Hi, folks ! Is there any serial port facilities in Qt ? If not, which crossplatform (desirable) libraries (for working with serial port and, maybe, with other I/O ports), do you recommend ? Take a look at the Project QextSerialPort. Well, there's always Boost. In Boost there is a great Async I/O library called ASIO. It can perform operations in all sorts of endpoints, including serial ports. There is a great example about how to build a minicom-like application using Boost::Asio, that you can use to see if ASIO will attend your needs. Since boost works on all platforms/compilers under the sun, the cross platform requirement can be checked. Cheers. Use QSerialDevice Thank you kuzulis! QSerialDevice works fine! If there is a chance to do the task in Qt, I would never select boost as alternative. Here is a Qt serial library, works on Win, WinCE, Linux

Serial Port Communication
Serial Port Communication Hello, I want to send data hex format (0x01) or (0xff) to the port where rs232 cable is connected. I am using the MSCOMM control in VC++ 6.0. Is that the correct way to send the hex data. This is the code I have. CString output; UCHAR data1,data2; data1=0x01... may re-format the data to an ASCII string representation instead. Alternatively, you can just use any serial port as a 'file' in Windows. Look at the windows api for opening files and you will see that you can address certain devices as files by using a filename like 'COM1:' instead. Then, you can read/write from it like a file. maybe this will help you link If your data is simply a hex value that you want to send out (as opposed to a hex formatted string), you probably want "%c" rather than "%x". Given a data value of (e.g.) 0x65, "%x" will produce two bytes on the serial port: '6' (ascii

Virtual Serial Port for Linux
Virtual Serial Port for Linux I need to test a serial port application on Linux, however, my test machine only has one serial port. Is there a way to add a virtual serial port to Linux and test my application by emulating a device through a shell or script? Note: I cannot remap the port... RFC 2217 RFC 2217 covers a com port to TCP/IP standard that allows a client on one system to emulate a serial port to the local programs, while transparently sending and receiving data and control signals to a server on another system which actually has the serial port. Here's a high-level overview. What you would do is find or implement a client com port driver that would implement the client side of the system on your PC - appearing to be a real serial port but in reality shuttling everything to a server. You might be able to get this driver for free from Digi, Lantronix, etc in support

Serial Port Redirection or Splitting
Serial Port Redirection or Splitting I am looking for a book and or a code sample of how to do serial port redirection or port splitting. I write a lot of com port applications and want to write a monitor application that will allow me to watch the serial port between the application and the device. So I want to be able to redirect the serial port to another port so I can monitor the data flowing between ports. I understand in some cases this must be accomplished at the kernel level. (in USB cases) I have written the monitor application using system.IO.Ports in C#. If I have to call a C... by any stretch, and it really can't be done in user mode. The Windows DDK does have sample code for a port filter driver, but it is a lot of work to go from the sample to something useful. A pure user mode solution that might work out is to use two additional serial ports to eavesdrop on the wire

Serial port determinism
Serial port determinism This seems like a simple question, but it is difficult to search for. I need to interface with a device over the serial port. In the event my program (or another) does not finish writing a command to the device, how do I ensure the next run of the program can successfully... want. Is there any way to make this more deterministic? Serial port programming feels very out-of-control due to issues like this. I would guess that if you call write("A_VERY_LONG_COMMAND"), and then the user hits Ctrl+C while the bytes are going out on the line, the driver layer should finish... a timeout to make the device ignore unfinished or otherwise corrupt packets. The required method depends on the device. Serial ports have additional control signal lines as well as the serial data line; perhaps one of them will reset the device's input. I've never done serial port programming but I think

Serial port communication in VC++
Serial port communication in VC++ when reading data through serial port VARIANT data; BSTR k; if(m_mscom.GetCommEvent() == 2) { data = m_mscom.GetInput(); k = data.bstrVal; } What is BSTR k; and what do you mean k=data.bstrVal? What is bstrVal? BSTR is a pointer to unicode character(just character type that can hold unicode character). data.bstrVal converts variant to BSTR. BSTR and VARIANT are data types used in COM. Actually, VARIANT is a container that may hold any COM data type. In your case, GetInput() returns VARIANT containing a buffer as BSTR, so bstrVal has to be used to retrieve

Send binary to the serial port
Send binary to the serial port To send a serial string character to the serial port. I would need to call WriteFile(handle, "A", strlen("A"), ...) However, what if I want to specify and send a hex or binary number? For example, I want to send WriteFile(handle, 0x41, sizeOf(0x41), ...) ? Is there a function that allow me to do this? If you just want to write one byte, it still needs to be in an array. So you would need: int buffer[1024]; buffer[0] = 42; WriteFile(handle, buffer, 1); See this: http://msdn.microsoft.com/en-us/library/aa365747(VS.85).aspx There are many ways. The most straight forward for you though would be WriteFile( handle, "\x41", 1 ... ); The strlen() is redundant, since you know the length