Only in rare cases, with duplicate equipment in a molding cell, must an address be modified.ДЇile:SpiInUse.png|thumb|SPI Tributary port while in use There are no discrete wires to connect, no 'coils' or commands to define, no programming of any sort. All of the devices are set to the same baud and the host-controller is set to interact with them by enabling the device type in a GUI. The tributaries are plugged into the host-controller and their interfaces enabled. The plastics processing equipment, referred to as tributaries by the standard, are generally taken as the auxiliary equipment, such as the Dryer, Chiller, Loader, Blender, Additive feeder, Hot-runner temperature controller, Mold temperature controller, etcetera.Д¬onfiguration of protocol-compliant equipment is fairly straight forward in most cases. The Host-Controller may be a standalone computer but is most often a function of the injection molding machine. A Poll is a query for a setting or state from a piece of equipment known as a Tributary and a Select changes the same. The SPI Communication Protocol defines a relationship where a Host-Controller, also known as a Control-Station, may Poll or Select each Tributary. The popular moniker 'SPI' has become increasingly unfortunate as it is an acronym shared with another communication protocol, the Serial Peripheral Interface, with widespread use in all industries. This protocol would later be referred to by the Machinery Division as CCP Phase I, but that name is all but unknown today. This protocol was introduced in 1989 as a replacement for the many proprietary protocols, as well as loosely defined general-purpose protocols such as Modbus. The SPI Communication Protocol or SPI, as it is known in the plastics industry, was developed by the Society of the Plastics Industry, Machinery Division, Committee on Communication Protocol (CCP) to provide for centralized monitoring and control of plastics processing equipment.

Spi serial communication protocol