aattanayake Posted February 3, 2011 Posted February 3, 2011 Hello, I'm new to .NET. I have an application that is running in VB6. It sends text through COM1 port to another device. When I converted the VB6 code to .NET the string it sends out is different! I have tried so many things and don't know what to do. I used a serial data analyzer and found the two strings are different even the the source code is the same. VB6 source code: MSComm1.CommPort = 1 MSComm1.Settings = "9600,O,8,1" MSComm1.PortOpen = True MSComm1.Output = Chr(&H2B) & _ Chr(&H4) & _ Chr(&H3) & _ Chr(&HE8) & _ Chr(&H0) & _ Chr(&H2) & _ Chr(&HF6) & _ Chr(&H71) MSComm1.PortOpen = False The analyzer gets the following string in hex: 2B 04 03 E8 00 02 F6 71 VB.NET source code: Dim Port As SerialPort = New SerialPort("COM1", 9600, Parity.Odd, 8, StopBits.One) Port.Open() Port.Write(System.Convert.ToChar(&H2B) & _ System.Convert.ToChar(&H4) & _ System.Convert.ToChar(&H3) & _ System.Convert.ToChar(&HE8) & _ System.Convert.ToChar(&H0) & _ System.Convert.ToChar(&H2) & _ System.Convert.ToChar(&HF6) & _ System.Convert.ToChar(&H71)) Port.Close() The analyzer gets the following string in hex: 2B 04 03 0F 00 02 3F 71 Why is there a difference in the string? Please help me correct it... Thanks
aattanayake Posted February 3, 2011 Author Posted February 3, 2011 I found something interesting. when I convert a number using System.Convert.ToChar(X) and sends it through serial the X can only be hex:0 to hex:3F if I want to get the correct value from the other side. Any value greater than hex:3F will not be hex:3F. for example if I send hex:64 you will get hex:3F send hex:E8 you will get hex:3F It seems like it max out with a 6 bit register value, Please help me correct this mess ...
aattanayake Posted February 4, 2011 Author Posted February 4, 2011 I found the answer and got it working .... From: http://msdn.microsoft.com/en-us/library/y2sxhat8.aspx By default, SerialPort uses ASCIIEncoding to encode the characters. ASCIIEncoding encodes all characters greater then 127 as (char)63 or '?'. To support additional characters in that range, set Encoding to UTF8Encoding, UTF32Encoding, or UnicodeEncoding.
cloudmonkey Posted July 21, 2011 Posted July 21, 2011 I found the answer and got it working .... From: http://msdn.microsoft.com/en-us/library/y2sxhat8.aspx By default, SerialPort uses ASCIIEncoding to encode the characters. ASCIIEncoding encodes all characters greater then 127 as (char)63 or '?'. To support additional characters in that range, set Encoding to UTF8Encoding, UTF32Encoding, or UnicodeEncoding. UTF32 is the way to go...
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