① Transmission technology: RS-485 twisted pair, two-wire cable or optical cable. The baud rate ranges from 9.6K bit/s to 12M bit/s.
②Bus access: token transfer between master stations, master-slave transfer between master station and slave station. Support single-master or multi-master systems. The maximum number of stations (master-slave) on the bus is 126.
③Communication: point-to-point (user data transmission) or broadcast (control command). Cyclic master-slave user data transfer and acyclic master-master data transfer.
④Operation mode: run, clear, stop.
