I am working on write a program that reads and writes from the barcode
my problem when writing (send command to barcode)
I read in pdf manufacturer barcode that the command of capturing the image is IMGSNP so i pass it to write function as follows serialPortObj.write ("IMGSNP")
But Why does not have a barcode to respond to the command ? and did not capture the image :(
Is this wrong way
(I have in some cases may need to take image Not for barcode it self but image for passport or product etc.. Which doesn't contains a barcode )
Barcode manufacturer is HandHeld (4800p)
Thanks for any help
here is my code
private SerialPort Com ;
private delegate void DataReadDel(string Text);
private void Form1_Load(object sender, EventArgs e)
{
Com = new SerialPort("COM4");
Com.Open();
Com.DataReceived += new SerialDataReceivedEventHandler(port_DataReceived);
}
private void port_DataReceived(object sender,SerialDataReceivedEventArgs e)
{
Com.Encoding = Encoding.Default;
this.BeginInvoke(new DataReadDel(DataReceived), new object[] {Com.ReadExisting() });
}
private void DataReceived(string dR)
{
textBox1.Text = dR;
}
private void button1_Click(object sender, EventArgs e)
{
if (! Com.IsOpen )
{
Com.Open();
}
Com.Write("IMGSNP1B1L");
Com.Write("IMGSHP");
string imgbytes = Com.ReadExisting();// return ""
}
You need to send the Serial command header along with the IMGSNP command to have the scanner capture and send the image. The header is three ASCII characters: SYN M CR (ASCII 22,77,13).
Are you sure that the barcode reader is not capturing the image? According to the documentation:
An image is taken when the Image Snap (IMGSNP) command is processed. The last image is always stored in memory. You may “ship” the image by using the IMGSHP command.
So you may be taking the image using IMGSNP, but all that's happening is that its storing the image in memory, and not sending it back to you as a response. Try then issuing the IMGSHP command, and see if there's any data to be read from your serial port.
You need to send the SYN M CR first before the device considers taking your request in.
The following information is obtained with my own barcode reader while trying to do something quite similar.
When using IMGSHP, the device will reply with a SYN (0x16) followed by 0xfe [4 bytes of data length, little endian] 0x0d [some data] 0x1d [image data]
As well as the command itself, do you have to provide any termination characters?
A common method is to wrap the command packet in STX and ETX characters so the barcode reader will know when a full command has been received, or possibly just terminate with a carriage return (CR) and linefeed characters (LF). You need to check the specs.
Also, since you are sending a string, encoding may be important, and I would expect the barcode reader needs ASCII characters sent to it, but again, you should check the unit to be sure.
I suspect the easiset way to send a command is to send it as an array of bytes, which makes it easier to use the STX, ETX, CR or LF characters if necessary, as these are non-printable characters and have the following values:
STX = 0x02, ETX = 0x03, CR = 0x0D, LF = 0x0A
Related
I am trying to use ReadExisting method under the serial port. the method return for me a string. however I want to convert this data into bytes.
the sender sends me bytes witout encoding.
however when I am trying to use the ReadExisting method and convert it to bytes I am not getting the exact bytes. (closer but no all of them are translate it correctly.
I tried to use get bytes in Encoding (tried UTF8,ASCII and others) however didn't find the correct one. how can I know which encoding it does?
private void _serialPort_DataReceived(object sender,
SerialDataReceivedEventArgs e)
{
int BytesToRead = _serialPort.BytesToRead;
if (BytesToRead > 1)
{
string tmpExist = _serialPort.ReadExisting();
SerialInfo _SerialInfo = new SerialInfo();
byte[] tmpData = Encoding.ASCII.GetBytes(tmpExist); //
System.Text.Encoding.ASCII.GetBytes(tmpExist);
}
Thanks
I believe the serial port .Encoding property will get you what you are after. It has been a few years, but I think that was it.
I'm trying to print my language characters to a POS printer. The Printer prints well but the result's so bad. This is what I tried:
using (MemoryStream ms = new MemoryStream())
using (BinaryWriter bw = new BinaryWriter(ms))
{
bw.Write(AsciiControlChars.Escape);
bw.Write('#');
//ESCCMD.RenderBitmap(bw, logo);
bw.Write("Đây là Tiếng Việt");
bw.Write(AsciiControlChars.Escape);
bw.Write('d');
bw.Write((byte)3);
// Feed 3 vertical motion units and cut the paper with a 1 point uncut
bw.Write(AsciiControlChars.GroupSeparator);
bw.Write(AsciiControlChars.V);
bw.Write((byte)66);
bw.Write((byte)3);
bw.Flush();
RawPrinterHelper.SendToSerialPort(ms.ToArray(), txtPortTest.Text, Convert.ToInt32(cbbBaudRate.SelectedValue));
}
So how can I print my language characters using ESC/POS command?
Thanks so much!
Before printing international characters you need to check if your specific model supports the corresponding codepage and then set it with the ESC t command. The list of supported code pages for EPSON printers and the command syntax info is available here: https://reference.epson-biz.com/modules/ref_escpos/index.php?content_id=32 (registration required)
For example, in order to print Greek (ISO-8859-7) text, you need to do something like this:
private void PrintGreekIsoText(BinaryWriter bw, string text)
{
// ESC t 15
bw.Write("\x1bt\x15");
// Convert the text to the appropriate encoding
var isoEncoding = Encoding.GetEncoding(28597);
var bytes = Encoding.Unicode.GetBytes(text);
byte[] output = Encoding.Convert(Encoding.Unicode, isoEncoding, bytes);
bw.Write(output);
}
I have an application that requires I send a string of 4-10 ASCII character to an RS422 Uart serial receiver. The problem is that the Uart buffer can only receive 2bytes max ever 10ms or so. How do I parse out the data and send it in chunks without timing out on the other side.
Normal serial.write() method overflows the buffer and I get an error response from the device every time I send anything. The device specified a baudrate of 19200 but also say the data i write needs to be spaced out 2 bytes at a time. There is no parity, handshake or flow control support for the device.
Essentially I want to do something like this:
private void sendData(string text)
{
string textnew = text +(char)13;
byte[] r_bytes = Encoding.ASCII.GetBytes(textnew);
if (SeriialComms.IsOpen)
{
for (int i = 0; i > (textnew.Length/2); i = i + 2)
{
byte[] bytesToSend = { r_bytes[i], r_bytes[i+1] };
SerialComms.Write(bytesToSend, 0, 2);
System.Threading.Thread.Sleep(10);
}
}
}
is this possible and is there an easier way to do this?
I'm talking serially to a Smart Motor and I'm trying to look for the specific string "# Positon" coming back from the motor. When I see that I want to set the Play button to be enabled (btnPlay.Enabled=true;).
I've tried every way but can't seem to fit it to the following code. What can I place in my code below where I can test the incoming data and then trigger the enable?
The following code works - I just don't know where and how to read for specific information.
private void port_DataReceived(object sender, SerialDataReceivedEventArgs e)
{
// If the com port has been closed, do nothing
if (!comport.IsOpen) return;
// Determain which mode (string or binary) the user is in
if (CurrentDataMode == DataMode.Text)
{
// Read all the data waiting in the buffer
string data = comport.ReadExisting();
// Display the text to the user in the terminal
Log(LogMsgType.Incoming, data);
}
else
{
// Obtain the number of bytes waiting in the port's buffer
int bytes = comport.BytesToRead;
// Create a byte array buffer to hold the incoming data
byte[] buffer = new byte[bytes];
// Read the data from the port and store it in our buffer
comport.Read(buffer, 0, bytes);
// Show the user the incoming data in hex format
Log(LogMsgType.Incoming, ByteArrayToHexString(buffer));
}
}
I am having a problem with reading my sms through putty, Its beacuse I type AT+CMGL="ALL" but the message(text) and number are just numbers, I read that my gms modem nokia s10 uses UCS2, but I dont know what to do here? how can I read my message intead of just seeing numbers?? help please
Also I am using this code from codeproject and I changed this line but It is the same result as putty just number in ucs2
public ShortMessageCollection ReadSMS(SerialPort port, string p_strCommand)
{
// Set up the phone and read the messages
ShortMessageCollection messages = null;
try
{
#region Execute Command
// Check connection
ExecCommand(port,"AT", 300, "No phone connected");
// Use message format "Text mode"
ExecCommand(port,"AT+CMGF=1", 300, "Failed to set message format.");
// Use character set "PCCP437"
**ExecCommand(port, "AT+CSCS=\"UCS2\"", 300, "Failed to set character set.")**;
// Select SIM storage
ExecCommand(port,"AT+CPMS=\"SM\"", 300, "Failed to select message storage.");
// Read the messages
string input = ExecCommand(port, p_strCommand, 5000, "Failed to read the messages.");
#endregion
#region Parse messages
messages = ParseMessages(input);
#endregion
}
catch (Exception ex)
{
throw ex;
}
if (messages != null)
return messages;
else
return null;
}
Notice that AT+CSCS only affects string parameters to commands and responses. In the case of AT+CMGL the content of the message is not a string, but a <data> format. See the 27.005 specification for more details on that format, it is a bit complicated (only pay attention to the first In the case of SMS part, ignore the second In the case of CBS part).
But the short version of it is that for UCS-2 you will get the data hex encoded (e.g. two characters '2' and 'A' represents one byte with value 0x2A (ASCII/UTF-8 character '*')). So you should decode 4 and 4 received bytes as the hex encoding of the 16 bits in a UCS-2 character.
So decode into a byte array and then convert to string, see Appleman1234's answer for that (his answer does not address the core issue, namely the hex decoding).
To convert from the UCS-2 encoding store the result (input) in a byte array instead of a string and then call
System.Text.Encoding enc = Encoding.Unicode;
string myString = enc.GetString(myByteArray);
If the UCS-2 encoding is Big Endian then change System.Text.Encoding enc = Encoding.Unicode; to
System.Text.Encoding enc = Encoding.BigEndianUnicode;.
Related resources include:
Unicode and .NET
C# big-endian UCS-2