sigrok-dumps/biss/README at 3c488ca3861dfeab948fd427f016cb16a0f08d41 · sigrokproject/sigrok-dumps · GitHub

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--------------------------------------------------------
BISS C / Renishaw Encoder
--------------------------------------------------------

This is a set of example captures of unidirectional BISS
communication with a Renishaw Resolute absolute encoder.

The BISS adapter used is an MB5U USB adapter from IC-Haus.

Although the encoder supports 32k updates per second, I
was not able to get the MB5U to exceed 70 updates per second.

Details:
https://www.ichaus.de/product/mb5u/
https://www.renishaw.com/resourcecentre/download/data-sheet-biss-c-mode-unidirectional-for-resolute-and-fortis-encoders--131419
https://biss-interface.com/wp-content/uploads/2024/07/BiSS_C_unidirectional_protocol_A3en.pdf


Logic analzyer setup
---------------------

The differential signal was converted using RS422 transcivers
on the MO+/- and SLO+/- lines.

The logic analyzer was a generic fx2lafw device at 24MHz

    Channels  Signal
    ------------------------
    1         MO  (Clock)
    3         SLO (Data)


All samples were captured with Pulseview using a sample rate of 24MHz and a sample length of 1M

The sigrok command might be
    sigrok-cli --driver fx2lafw --config samplerate=24m --samples 1m
               -c '1=MA,3=SLO' \
               -o renishaw_biss_1MHz.sr

renishaw_biss_250kHz.sr
--------------------

The MB5U was configured for 250kHz clock rate.

renishaw_biss_1MHz.sr
--------------------

The MB5U was configured for 1MHz clock rate.

renishaw_biss_2MHz.sr
--------------------

The MB5U was configured for 2MHz clock rate.

renishaw_biss_5MHz.sr
--------------------

The MB5U was configured for 5MHz clock rate.

renishaw_biss_10MHz.sr
--------------------

The MB5U was configured for 10MHz clock rate.