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RESOLUTE™ absolute optical encoder - BiSS C (unidirectional) protocol

BiSS C is an open-source protocol available on a variety of industry-standard drives, controllers and counter cards; offering high-speed (up to 10 MHz data rate), inherent safety and avoids the pitfalls of being locked into a single supplier!

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BiSS interface encoder serial communications protocol logo Renishaw supports BiSS® C (unidirectional) open protocol for absolute encoders. BiSS is a high-speed serial protocol, perfect for dynamic axes that require high acceleration, silky-smooth velocity control, excellent bi-directional repeatability and rock-solid positional stability.

RESOLUTE with BiSS is available in both linear and rotary (angle) encoder versions, compatible with a wide range of industry-standard controllers, drives, DROs and PC counter cards.

Proprietary protocol options for RESOLUTE absolute encoders are also available

RESOLUTE absolute linear encoders with BiSS

Rugged stainless steel FASTRACK™ RTLA track-mounted tape scale with ±5 µm/m accuracy, lengths up to 10 m and featuring quick and easy installation / scale replacement.
Tough RSLA stainless steel spars with ±4 µm total accuracy over an entire 5 m length, perfect for long axes where metrology cannot be compromised. For lengths up to 10 m, please contact your local Renishaw representative.
Ultra-high accuracy RELA Invar spar scales with guaranteed accuracy better than ±1 µm on lengths up 1130 mm, certified to International Standards.

The maximum scale length is determined by the readhead resolution multiplied by the number of position bits in the serial word. For RESOLUTE readheads with fine resolution and short word length, the maximum scale length will be limited accordingly. Conversely, coarser resolutions or longer word lengths enable the use of longer scale lengths.

RESOLUTE with BiSS C (unidirectional) protocol has two options for the position word length; 32 bits and 26 bits. The 32 bit position word facilitates longer lengths that can be a significant benefit, especially at fine resolutions. For 5 nm and 50 nm resolution readheads with a 32 bit position word, it is possible to use the full 10 metre scale length offered by RTLA and RSLA.

Resolution (nm)	1	5	50
Max scale length with 32 bit position word	4,285 mm	10,000 mm	10,000 mm
Max scale length with 26 bit position word	57 mm	326 mm	3,345 mm
Maximum reading speed	100 m/s	100 m/s	100 m/s

RESOLUTE absolute rotary (angle) encoders with BiSS

Monolithic stainless steel RESA rings with high-precision graduations marked directly onto the periphery, also featuring large internal diameters for easy integration. Unique taper mount enables quick installation and easy adjustment to compensate eccentricity of the mounting shaft.

Ultra-high accuracy REXA rings with thicker cross-section, guaranteed to achieve ±1 arc second total installed accuracy with dual readheads*.

Absolute rotary (angle) encoder resolutions and speeds

RESA diameter (mm)	Available resolutions			Maximum speed (rev/min)
RESA diameter (mm)	18 bits (4.94 arc seconds)	26 bits (0.019 arc seconds)	32 bits (0.0003 arc seconds)	Maximum speed (rev/min)
52				36,000
75				25,000
104				18,000
115				16,500
150				12,000
209				9,000
229				8,300
255				7,400
300				6,300
350				5,400
417				4,500
489				3,900
550				3,400

Note that 32 bit resolution is below the noise floor of the RESOLUTE encoder.

*REXA total installed accuracy is better than ±1 arc second on ring diameters larger than 100 mm, when installed to the specifications detailed in the REXA installation guide. For accuracy specifications for smaller rings, please refer to the REXA datasheet.

BiSS® is a registered trademark of iC-Haus GmbH

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Data sheets

[1.6MB] Data Sheet: RESOLUTE™ absolute optical encoder with BiSS serial communications
RESOLUTE™ is a revolutionary new true absolute, fine pitch optical encoder system, with excellent dirt immunity, offering an impressive specification that breaks new ground in position feedback.
[204kB] Data sheet: BiSS® C-mode (unidirectional) for RESOLUTE™ encoders (recommended)
Renishaw encoders use BiSS C-mode (unidirectional) serial protocol (L-9709-9001) and output 32-bit or 26-bit position information (single-turn for rotary). For linear encoders, the equivalent linear distance resolutions available are specified on the product data sheet.
[1.8MB] Data sheet: RESOLUTE™ absolute optical encoder with FANUC serial communications
True absolute non-contact optical encoder system: no batteries required; Wide set-up tolerances for quick and easy installation; High immunity to dirt, scratches and light oils
[1.3MB] Data Sheet: RESOLUTE™ absolute optical encoder for Panasonic A5/A5L /A5N servo drives
RESOLUTE™ is a revolutionary new true absolute, fine pitch optical encoder system, with excellent dirt immunity, offering an impressive specifi cation that breaks new ground in position feedback.