COLAN III, a control-oriented LAN using CSMA/CD protocol

Graduation date: 1988COLAN III is a control oriented LAN designed to achieve reasonable\ud network performance and flexibility at low cost. These objectives are\ud achieved by utilizing inexpensive microcontrollers (8031s) and hardware\ud support. The CSMA/CD network protocol with single bus structure has\ud been employed in COLAN III as an arbitration method to control the access\ud to the bus.\ud This thesis discusses the design and implementation of COLAN III in\ud two detailed parts: the system structure and the operating system. The\ud COLAN III bus uses the EIA RS-485 standard, which has a higher data rate\ud and a lower error rate than the conventional RS-232C standard. The\ud COLAN III operating system was developed using two implemented nodes and\ud later tested with three nodes. Every control-oriented task and electronic\ud mailing activity worked with three nodes, meaning that the system should\ud logically work with any number of nodes