The open source BiSS interface (bidirectional/serial/synchronous) is based on a protocol which implements a real time interface. It enables a secure serial digital communication between controller, sensor and actuator. The BiSS protocol is designed in B mode and C mode (continuous mode). It is used in industrial applications which require transfer rates, safety, flexibility and a minimized implementation effort. The BiSS interface has roots in SSI and a simplified INTERBUS. The proprietary standards, Hiperface and EnDat are competing solutions.
Application
Position sensor system
Rotary encoder (absolute encoder) Linear position sensors (absolute encoder) Drive control (motor feedback) Intelligent sensor system (smart sensors) Robotics
BiSS features
Open source
Hardware compatible for SSI standard (synchronous serial interface) Cyclic reading of sensor data up to 64 bit per slave Transmission of status data, parameter, measured temperature value, configuration description, etc. Isochronal, real time capable data transmission bidirectional communication with two unidirectional lines Point-to-point or multi-slave networks Maximum user data rate, transmission data depending on driver and line of e.g. RS-422: 10 MHz, 1 km; LVDS: 100 Mbit/s Independent of the applied physical layer CRC secured communication (sensor data and control data secured separately)
Characteristics of BiSS C
Continuous sensor data transmission without interruption while using control data Activation of actuators in bus during sensor data transmission Broader standardization through BiSS profiles, BiSS EDS (electronic data sheet), BiSS USER DATA, etc. Full compatibility of BiSS identifier (already defined in BiSS B)
History of BiSS in position sensor system
BiSS was showcased in 2002 by its founders iC-Haus GmbH
Since BiSS B is not motor feedback compatible, BiSS C has been preferred in the market All patent cases against BiSS B were dropped in 2012: EP 0790489B1: "Mode switching by frequency comparison" DE 19701310B4: "Mode switching as such" EP 1168120B1: "Block transmission of additional uncritical data" Multi-cycle data (MCD) are no longer utilized in the position sensor system with BiSS Because BiSS utilizes the PHY of SSI [(RS-422)], it develops as the successor of the SSI interface in automation
References
External links
BiSS Interface Website
BiSS C Protocol Description (English)
