| Title |
Implementation of two wire RS232C Serial Communication Interface using CSMA protocol |
| Authors |
Kyong-Ho Han; Cheon-Won Choi |
| Abstract |
In this paper, we implemented 2-wire (data, gnd) RS232C serial communication interface by applying the Collision Sensing Multiple Access(CSMA) Protocol. The transmitting and receiving wires of RS232C port are connected together by the interface circuit forming data wire without hardware modification. On two-wired common channel connection simultaneous transmission from more than two hosts causes data collision. The collision is detected by loop-back test of transmission data comparing with the fed back data to detect the data distortion. Various models are adopted to reduce the probability of retransmitted data collision and experiments show the performance of each cases. Due to allowing multiple hosts to be accessed through the common communication channel with minimum circuit addition, the result of this paper can be easily applied for conventional RS232C instruments and machines to connect to the single data communication line. |