BiSS interface
Open source interface
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 (continuously bidirectional 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.
01Application
- Position sensor system
- Rotary encoder (absolute encoder)
- Linear position sensors (absolute encoder)
- Drive control (motor feedback)
- Intelligent sensor system (smart sensors)
- Robotics
02BiSS 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)
03Characteristics 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)
04History 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
Sources and credits
This article is adapted from the Wikipedia article “BiSS interface”, written by its contributors and licensed under CC BY-SA 4.0. Fathomly has changed the layout, removed citation markers, navigation and maintenance notices, and adjusted punctuation. This adapted version is shared under the same license. For references, see the original article.
Images, from Wikimedia Commons:
- BiSS Interface Logo.png by iC-Haus GmbH Sales, Public domain
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