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MARCH 2019 I SMT007 MAGAZINE 45 The communications physical and data link layers (Levels 0, 1, and 2) can be as simple as serial RS-232C, RS-422, RS 485, USB, or Blue- tooth to the complex Ethernet (IEEE-802.3). There are three available versions of Ether- net: 10BaseT, 100BaseTX (fast Ethernet) and 1000BaseT (also known as gigabit Ethernet be- cause it transmits Ethernet frames at a rate of one gigabit per second). Levels 3 and 4 are the network and transport layers, which are popular for an automated factory are PLC protocols, such as: • Modbus RTU • ProfiNet • DirectNET • EtherNet / IP • ModbusTCP/IP • Ethernet TCP/IP Levels 5, 6, and 7 are the software control layers and house the various application pro- grams. More on OML, CFX, and the SEMI SECS/ GEM protocols in a future publication. SMT007 Further Reading To learn more about factory automation and smart factories, including planning, real ex- amples and process control basic, download I-Connect007's free eBook Automation and Advanced Procedures in PCB Fabrication at (Figure 11). References 1. Holden, H.T. "Complexity Factor C." IPC Technical Re- view, March/April 1986. 2. Phil Kinner, technical director of Electrolube's coatings division, speaks with I-Connect007 Technical Editor Pete Starkey about how secondary cure issues with UV conformal coatings have been overcome and shows some typical examples. Click image to view. RTW IPC APEX EXPO 2019: Electrolube Discusses Overcoming Secondary Cure Issues

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