BiSS interface
The open source BiSS interface 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. 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
- * Linear position sensors
- Drive control
- Intelligent sensor system
- Robotics
BiSS features
- Open source
- Hardware compatible for SSI standard
- 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
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, BiSS USER DATA, etc.
- Full compatibility of BiSS identifier
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 are no longer utilized in the position sensor system with BiSS
- Because BiSS utilizes the PHY of SSI, it develops as the successor of the SSI interface in automation