Communication system for control applications

The communication system is a cyclic, serial, multi-drop, master-slave, half-duplex protocol having data formatted into receive frames and transmit frames carried on two separate wires. Both receive frame and transmit frame have the same structure and are synchronized with each other. Each frame com...

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1. Verfasser: MING C CHEN
Format: Patent
Sprache:eng
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Zusammenfassung:The communication system is a cyclic, serial, multi-drop, master-slave, half-duplex protocol having data formatted into receive frames and transmit frames carried on two separate wires. Both receive frame and transmit frame have the same structure and are synchronized with each other. Each frame comprises a flag byte 602 followed by 8 device channels 604, 606...608, each channel comprising 3 bytes space. The flag byte is used as a reference for frame synchronization. Physical connection is by way of two half duplex RS-485 multipoint links utilizing telephone cable for connection between devices. Application is to mail handling apparatus with control sensors, motors, etc.