go@orstcs.cs.ORST.EDU (05/02/87)
Bear with me if this isn't the correct spot for this...
Recently, I have had an occasion to look at a communication
"protocol" called SECS (Semi Equipment Communications Standard)
levels 1 and 2. After reading the SEMI documents (revised 1986)
I wanted to get some "feedback" from other users. At the top
level, I completely understand what SECS-I and II are trying to
do, but am confused on a couple of points:
1) The protocols claim to have originated before the ISO/OSI
model, however, they claim an initial release of 1980. If
my memory is correct, the ISO/OSI model appeared in the
late 70's? They must have worked on SECS for 2 or more
years in a vaccuum.
2) SECS-II, the stream/function level appears to be somewhat
uncertain of its purpose: It appears as an application-
layer in places, but does some of the very-low-level
ack/nak stuff too. Why? This might make it cumbersome
to apply on top of an existing LAN -- lots more overhead
unless LAN is MUCH HIGHER SPEED than SECS message traffic.
Anyway, my main question is: How widespread is the use of SECS
(someone must be really chuckling over the pronunciation of the
acronym by now...); is it gaining in popularity or declining?
Do you recommend its use or not? Why? Should I take my question
elsewhere (...dcom) ? Since is it for semiconductor manufacturers
I thought I would start here.
Thanks. I'd be glad to post results to net, and all that. Please
mail responses to me for now.
Gary Oliver
...!hplabs!hp-pcd!orstcs!go