Re: Ethernet/IP Device Support and CompactLogix

[Kay-Uwe Kasemir <kasemirk@ornl.gov>]

On Apr 6, 2006, at 13:19 , John Dobbins wrote:
> The Name returned is "1769-L35E Ethernet Port". Details below.
> ...

>     UINT data_length        52
> ..
>     Data (net format) =
>     00000000 17 31 37 36 39 2D 4C 33 35 45 20 45 74 68 65 72 - . 
> 1769-L35E Ether
>     00000010 6E 65 74 20 50 6F 72 74 00 00 00 00 00 00 00 00 - net  
> Port........
>     00000020 01 00 EB CD 1E 00 00 00 0E 02 0E 01 0E 00 0E 00  
> - ................

I'll be darned. So it's
  BYTE length=23
  char name  = "1769-L35E Ethernet Port" (23 chars, less than 32, OK)
... plus more junk to get a package of 52 bytes.

I don't know what's in those remaining package bits,
at least I don't find those in my older copy of the specs,
but something like this in ether_ip.c, EIP_check_interface,
should handle it:
    ..
    data = EIP_Get_Attribute_Single(c, C_Identity, 1, 7, &len);
    if (data && len > 0)
    {
        len = *((CN_USINT *) data);
        if (len >= sizeof(info->name))
            return false;
        memcpy(
    ..


Again, thanks for looking into this.
-Kay