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. PLT-22 transceiver featuring a dual carrier and narrow band frequency can complete data communication on LonWorks power line network, the transceiver can overcome the drawbacks of noise sources, attenuation, distortion. Experiments show that LonWorks node achieving power communication based on Slave A parallel mode has good communication and high real-time performance.