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2. DirectLOGIC - Wikipedia

   en.wikipedia.org/wiki/DirectLOGIC

   DirectLOGIC is a range of programmable logic controllers produced by Koyo. They are programmed using DirectSOFT via: RS-232; USB port with USB-to-Serial adapter; 10BASE-T or 10/100 Ethernet network card

3. Koyo Electronics Corporation Limited - Wikipedia

   en.wikipedia.org/wiki/Koyo_Electronics...

   Koyo Electronics (Kōyō Denki) and its subsidiary Koyo Electronics Industry (Kōyō Denshi Kōgyō), often collectively referred to as just Koyo, are Japanese electronics companies based in Kodaira, Tokyo [2] that manufactured radios from 1955 until 1973, and now its subsidiary manufactures industrial electronics devices and factory automation control systems.

4. List of automation protocols - Wikipedia

   en.wikipedia.org/wiki/List_of_automation_protocols

   DF-1 - used by Allen-Bradley ControlLogix, CompactLogix, PLC-5, SLC-500, and MicroLogix class devices; DNP3 - a protocol used to communicate by industrial control and utility SCADA systems; DirectNet – Koyo / Automation Direct proprietary, yet documented PLC interface; EtherCAT; Ethernet Global Data (EGD) – GE Fanuc PLCs (see also SRTP)

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6. DirectNET Protocol - Wikipedia

   en.wikipedia.org/wiki/DirectNET_Protocol

   Koyo DirectNET protocol is used by DirectLOGIC PLCs from Automation Direct and is used in APS vacuum controls since 1999. It is a master/slave protocol making use of RS-232 or RS-422 physical layers with a baud rate from 300 to 38,400. It is designed to drive a maximum of 90 PLCs on a serial line.

7. Ladder logic - Wikipedia

   en.wikipedia.org/wiki/Ladder_logic

   Ladder logic is widely used to program PLCs, where sequential control of a process or manufacturing operation is required. Ladder logic is useful for simple but critical control systems or for reworking old hardwired relay circuits. As programmable logic controllers became more sophisticated it has also been used in very complex automation systems.