BISS Interface Encoders

The BiSS Interface (bidirectional/serial/synchronous) protocol is an – Open Source – digital interface which enables a digital, serial and secure communication between controller, sensor and actuator.

The BiSS protocol is used on the lower sensor/actuator communication level in industrial applications which require transfer rates, safety, flexibility and a minimized implementation effort.

BiSS is hardware compatible to the industrial standard SSI (Serial Synchronous Interface) but offers additional features and options:

Bidirectional Data Communication

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  Serial synchronous, continuous data communication

Two unidirectional lines Clock and Data

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  Cyclic at high speed (up to 10 MHz with RS422 and 100 MHz with LVDS)

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  Line delay compensation for high speed data transfer

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  Request processing times for data generation at slaves

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  Safety capable: CRC, Errors, Warnings

Actuators

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  Operate actuators via additional MO line (master to slave)

BiSS operates synchronously, serially and cyclically via two unidirectional lines. As the main feature BiSS in addition communicates continuously bidirectional (BiSS is the synonym for BiSS C; C = Continuously).

A typical setup of a BiSS system with a drive/PLC (BiSS master) and encoder (BiSS slave) is shown in Figure 1.

The position data is sent over a single cable from the BiSS slave on the right to the BiSS master on the left. The standard drive contains the blocks ”BiSS Master” and ”RS-422 Bus Transceiver” as well as the encoder contains the blocks ”BiSS Slave” and ”RS-422 Bus Transceiver”. The sensor that generates the position word can be a single chip solution or a set of separate encoder-iCs. The position data, the status and CRC values are evaluated in the BiSS master.

Figure 1: BiSS Interface, point-to-point.

Digital Sensor and Actuator Interface

The BiSS Interface line signals on clock line MA and data return line SLO.

Source: https://biss-interface.com