Practical aspects of the GEM model for factory automation

The `Generic Equipment Model for SECS Communications (GEM)´ (1988) proposed methodology for implementing SECS communication links on equipment, and suggests that equipment supporting the methodology could significantly reduce total factory automation costs. Previously, in the absence of any actual implementations of GEM, the benefits remained theoretical, and feasibility and cost remained unknown. The authors describe a software implementation of the GEM methodology, and its actual application on equipment. Some valuable practical lessons have been learned about applying generic host communication software on equipment, and about the GEM methodology