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I thought the www.watlow.com devices are just manufacturing PLC devices that are not running a Windows OS?
1) Not everything that does SMB is running Windows. It was originally for DOS, OS/2, and Unix, and there are both SMB clients (various flavors of smbfs/cifsfs) and servers (Samba, Apple's SMBX, etc.) that run on various flavors of UN*X.
2) Watlow's F4T Setup and Operations User's Guide says, on page 31, "Samba, also known as Server Message Block (SMB)/Common Internet File System (CIFS), is fully supported by Windows File Sharing. Within this document, SMB/CIFS will be referred to as Samba." and discusses the F4T's support for SMB. ("Samba" isn't another name for SMB; "Samba" is the name of a free-software SMB server program.)
So those devices may well be doing SMB1 and using NetBIOS-over-TCP.
