Using SSI encoder

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SSI (Synchronous Serial Interface) is a digital protocol used by many encoder feedback device manufacturers. IONI Pro servo drive supports SSI encoders starting from firmware version 1.6.1.

SSI support details

As SSI is loosely defined standard, drive's SSI support does not cover all possible variations of the protocol. The following list includes currently supported SSI encoders:

  • AMS 12 bit SSI encoders

Current firmware version limitations:

Wiring SSI encoder

Wiring of SSI depends on the variant of SSI protocol present.

AMS SSI encoder chips

AMS SSI encoders are wired following way to IONI encoder connector:

AMS wire IONI drive pin IONICUBE D-Sub 15 pin number Remarks
VSS (Ground) GND 10
VDD5V (5V input) 9 Pin 9 is 5V supply output from IONICUBE to encoder
CSn GPI2 12
DO GPI1 13

Refer to IONI & IONICUBE user guide for more info on wiring encoders.


SSI parameters in Granity. Example settings for AMS AS5311.

To configure SSI, use Granity version 1.11.1 or later. Configuration steps:

  1. Find out encoder MT and ST resolutions from encoder manufacturer's data sheet
  2. Select SSI Encoder from Feedback deviceFBD
  3. Select SSI type from Serial encoder typeFBS
  4. Set number of MT and ST bits into parameters [FBST] and [FBMT]. If MT not specified in encoder data sheet, set it zero.

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