Connecting CUI Devices AMT233B-V encoder to Servosila SC-25 Brushless Motor Controller Technical Note Revision A www.servosila.com/en/motion-control 1 www.servosila.
Table of Contents Introduction......................................................................................................................................3 SPI vs. SSI.......................................................................................................................................3 SPI configuration settings................................................................................................................4 2 www.servosila.
Introduction This technical note is written in regards to CUI Devices AMT233B-V absolute encoder, a 14bit absolute encoder. SPI vs. SSI The encoder provides a “single-ended SSI” interface which actually more resembles SPI than SSI (no RS422 compatibility). The encoder should be connected to the SPI interface of the Servosila SC-25 motor controllers rather than to the SSI/BISS-C interface. When making a cable, refer to the datasheets of both devices to match SPI pins of the corresponding connectors.
SPI configuration settings The following configuration settings of the SPI interface of Servosila SC-25 controllers have been found to work with the CUI Devices AMT233B-V encoders (14 bits resolution). For 12bit devices: • Change “counts per revolution”: 16384 → 4096 • Change “total number of bits in packets”: 16→14 • Change “POSITION field: length”: 14→12 4 www.servosila.
Servo drives designed around SERVOSILA SC-25C brushless motor controllers YouTube: http://www.youtube.com/user/servosila www.servosila.com/en/motion-control 5 www.servosila.
