Serial port encoding

  • Thread starter Thread starter Jack Russell
  • Start date Start date
J

Jack Russell

I am trying to use the serial port control to send and receive 8 bit
characters to/ from a n instrument. whatever I set encoding to it
converts the characters.

Any ideas how to stop it?

Thanks

Jack Russell
 
Jack Russell said:
I am trying to use the serial port control to send and receive 8 bit
characters to/ from a n instrument. whatever I set encoding to it
converts the characters.

Any ideas how to stop it?
Click to expand...

Can you give an example of the sent/received data? How did you find out that
it gets converted? How do you send the data (code)?


Armin
 
Armin said:
Can you give an example of the sent/received data? How did you find out
that it gets converted? How do you send the data (code)?


Armin
Click to expand...
I use a serialport sniffer program
(http://www.serial-port-monitor.com/index.html)
fantastic piece of freeware.

To output I use
serialport1.write(String)

I have found that if I set encoding to zero it seems to work
serailport1.encoding=encoder.getencoding(0)
although the documentation seems to state this is an illegal operation!
 
Jack Russell said:
I use a serialport sniffer program
(http://www.serial-port-monitor.com/index.html)
fantastic piece of freeware.

To output I use
serialport1.write(String)

I have found that if I set encoding to zero it seems to work
serailport1.encoding=encoder.getencoding(0)
although the documentation seems to state this is an illegal
operation!
Click to expand...

Which encoding does the device expect?


Armin
 
Armin said:
Which encoding does the device expect?


Armin
Click to expand...
This is the point, I and a lot of other people use serial ports to
transmit binary data, we do not want any encoding. According to the help
files the default is 7 bit ascii, but you can set the various unicode
alternatives. The help file says that setting 0 gives the "default"
which is patently not true
 
Jack Russell said:
This is the point, I and a lot of other people use serial ports to
transmit binary data, we do not want any encoding.
Click to expand...

If you send strings, they /do/ have an encoding. Every character does have a
number (one or two bytes).

Only zero-length strings don't have an encoding. :-)
According to the
help files the default is 7 bit ascii, but you can set the various
unicode alternatives. The help file says that setting 0 gives the
"default" which is patently not true
Click to expand...

"Default" usually means "ANSI" code page, which you can get from
System.Text.Encoding.Default.

In any case you must know which encoding the receiver expects.

As you probably know, Strings are stored as Unicode (2 bytes), so if you
want to send them with any other encoding, you must convert to an array of
bytes (Encoding.GetBytes).


Armin
 
Armin said:
If you send strings, they /do/ have an encoding. Every character does
have a number (one or two bytes).

Only zero-length strings don't have an encoding. :-)



"Default" usually means "ANSI" code page, which you can get from
System.Text.Encoding.Default.

In any case you must know which encoding the receiver expects.

As you probably know, Strings are stored as Unicode (2 bytes), so if you
want to send them with any other encoding, you must convert to an array
of bytes (Encoding.GetBytes).


Armin
Click to expand...
Sorry, I am not sending "strings" I am sending binary data. This is very
common with serial port applications. I want the 8 bits to be sent
exactly as is with no "translation". Every other serial port "driver" I
have ever seen can do this why cant .net
 
Jack Russell said:
Sorry, I am not sending "strings" I am sending binary data.
Click to expand...


You wrote:

serialport1.write(String)


I thought String means String. Now you write, you don't send a String.
What's right now?


Armin
 
Jack said:
This is the point, I and a lot of other people use serial ports to
transmit binary data, we do not want any encoding. According to the help
files the default is 7 bit ascii, but you can set the various unicode
alternatives. The help file says that setting 0 gives the "default"
which is patently not true
Click to expand...

The solution is very simple. If you want to send binary data, send
binary data. Don't send it as a string, send it as a byte array.
 
Göran Andersson said:
The solution is very simple. If you want to send binary data, send
binary data. Don't send it as a string, send it as a byte array.
Click to expand...
Thanks, just what I wanted. I should have fully read the help file I
suppose, too many years of fooling devices so it never occurred to me it
would be that easy!

Thanks again

Jack Russell
 
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