LonWorks technology is a complete development platform used in monitoring network system. In order to improve the real-time of LonWorks node, its master processor AT89C2051 and slave processor MC143150 will realize data exchange each other in Slave A parallel mode. Data transfer mechanism using virtual token passing can solve the issue of master and slave processor seizing the data bus. FTT-10A transceiver featuring ESD protection can complete data communication on LonWorks twisted pair network. Experiments show that LonWorks node based on Slave A parallel mode communicating on twisted pairs has good communication and high real-time performance.