Biss C Packet Structure; Biss C Communication Timing; Figure 8: Biss Data Exchange - Encoder A36R Technical Reference Manual

Model A36R
BiSS C can be implemented via user hardware according to the documentation provided by iC Haus at: biss-interface.com. iC Haus
offers various hardware solutions to facilitate BiSS C integration:
• iC-MB4 (BiSS Master Interface IC)
• iC-MB5U (BiSS-to-USB Adaptor)
Additional information regarding the BiSS C protocol can be found at the BiSS Interface website: biss-interface.com

8.2 BiSS C Packet Structure

The data frame for Model A36R encoders with BiSS C protocol is shown in Figure 8 below.

Figure 8: BiSS data exchange

The data frame includes a start bit, Control Data Slave (CDS), and Single Cycle Data (SCD). The SCD is the portion in blue in Figure 8
and includes the multi-turn position data (right-aligned), single-turn position data (left-aligned), low-active error bit nERR,
low-active warning bit nWARN, and a 6-bit CRC.
If the encoder was configured with no multi-turn bits, only single-turn position data will be sent.
nERR and nWARN can be monitored to provide indication of encoder errors and warnings respectively. See Section 6.2 for details.
Battery early warning and battery error will trigger these bits as well for encoders configured with the low power backup (XXL)
option.
The 6-bit CRC can be used to provide error checking to the critical encoder position data. Further details on CRC can be found in
Section 9. A 16-bit CRC is available upon special request. Please contact EPC if this option is required.
An optional 6-bit life cycle counter is also available upon special request. Please contact EPC if this option is required.

8.3 BiSS C Communication Timing

The encoder data is latched on the first rising clock edge. The encoder then delays its start bit and subsequent data transmission
for time (t ). After all data is transmitted, the encoder requires the timeout (t
busy
to initiate the next frame. See Figure 9 and Table 9 below for timing details.
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T E C H N I C A L R E F E R E N C E M A N U A L
) be met before additional clock pulses are sent
out
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EPC Technical Reference Manual – Model A36R
© 2023 Encoder Products Company, REV 11/08/2023