Question

I’m trying to read some data on the Serial Port but I doesn’t have the same result between a Monitor Software (like 232 analyzer) and my program.

Here is what 232 analyzer reads:

001 003 001 102 000 004 165 234 
001 003 006 144 000 008 068 169 
001 003 005 000 000 042 196 217 
001 003 001 096 000 042 197 247 
001 003 001 096 000 042 197 247 
001 003 014 000 000 042 198 253 

And here is what I read from SerialPort:

 001
 003 001 102 000 004 165 234
 001
 003 006 144 000 008 068 169
 001
 003 005 000
 000 042 196 217
 001
 003 001 096 000 042 197 247
 001
 003
 001 096 000 042 197 247
 001
 003 014 000 000 042 198 253

All my frames are just “truncated” and I don’t find out why.
The SerialPort is configured in 9600, n, 8, 1 in both programs.

How can I fix this and get the same frames that in 232 analyzer?

P.S:

I get frames like that (the ReadTimeout is set to 200ms):

while(true)
{
    byte[] buff = new byte[1024];
    int read = sp.Read(buff, 0, 1024);
    // ...
}

---

EDIT

When doing an Thread.Sleep(10); before reading, I get:

 001
 003 001 102 000 004 165 234
 001
 003 006 144 000 008 068 169
 001
 003 005 000 000 042
 196 217
 001
 003 001 096 000 042 197 247
 001
 003 001 096 000
 042 197 247
 001
 003 014 000 000 042 198 253

Answer 1

Serial ports are completely undelimited so whenever you read, you read what is available. That might be 1 byte, 10 bytes, or 1024 bytes. Wait a little longer and you’ll have more data, albeit of an entirely unpredictable size unless you only read a byte at a time.

The “monitor” software likely simply formats it into nice blocks for you.