METI-301G Miniature Ethernet Acquisition Module

The METI-301G-1 is a member of Curtiss-Wright's Miniature Stack Encoder family of data acquisition instruments. This module contains 255 individual filters, 254 of which are general purpose filters that scan incoming Ethernet frames looking for filter matches. One filter is a No Match filter which stores Ethernet packets that do not match any of the enabled general-purpose filter’s programmed settings. 

The No-Match filter can be enabled or disabled independently. All general-purpose filters search incoming Ethernet packets using a common group of up to 8 – 16 bit words. Any of these 8 words can be independently located anywhere within the incoming Ethernet frames. The general purpose filters all support a programmable mask which allows any of the up to 16 Bytes in the programmed search fields to be ignored. All Ethernet frames found to be a match to any specific filter’s programmed settings are individually triple buffered for coherency. All stored Ethernet frames include a timestamp to indicate when that frame entered the module’s input connector. 

Once an Ethernet frame is stored into any filter’s frame buffer, all of its data is available for data extraction into the stack’s Chapter 4 PCM output stream. Each filter has its own buffer status words which indicate various operational conditions of the buffer. The METI-301G-1 includes three general-purpose inputs. The real-time input state of these inputs is available by reading the status word of any filter. The module also includes three optically isolated outputs that are used to monitor the status of the Ethernet connection.