AB Soft Mercury 3000Si M3000SiDAA Configuration

FFrriinnggee CCoouunntteerr SSiizzee

The M3000SiDAA allows the user to configure the serial word to increase sampling rate. Some applications do not

require 18 bits of fringe count. The SPI Settings box allows the user to reduce the fringe counter to suit the applica-

tion and thereby increasing the maximum sampling rate of the system.

SSPPII OOuuttppuutt FFoorrmmaatt

The format of the SPI output can be configured to have the status word at the beginning or at the end of the serial

word.

SSPPII MMooddeess

There are two different SPI modes the users can select from:

latches the output buffer with the current data when the

falling edge of Chip Select is asserted.

can be used in applications where synchronization of the position data to an

event is required. Often, this mode is used when a fixed latency between a clock signal and the sampled

position data is required. If this option is selected a new calculation cycle starts each time the falling edge

of Chip Select is asserted. NOTE: This mode is equivalent to the SS-350cSI Trigger line. It use the falling

edge of the cs as trigger

IInnddeexx MMooddee SSeettttiinnggss::

Configure how the serial word data is manipulated when encountering the index angle position.

MMaasstteerr CChhiipp SSeelleecctt

Allows one hardware Chip Select to be used for all channels to minimize wiring connections.

FFeeeeddbbaacckk CClloocckk SSeelleecctt

Allows the user to select the optional Feedback clock. The Feedback clock signal is used to eliminate propagation

delays due to long cable lengths.

CCRRCC SSeettttiinngg

Allows the user to generate a CRC (Cyclic Redundancy Check). The CRC is located within the status word. The CRC

is only valid when the status byte is at the end of the serial word (see SSPPII OOuuttppuutt FFoorrmmaatt above) and the wholw

fringes (18 bits) are read.

Note: The polynomial used for CRC calculation is 10011. The resulting checksum is 4 bits and performed on the 28

bits position word only, the status bits are not used in the CRC calcualtion.

M3000SiDAA Configuration

CChhaannnneell 11 && 22 CCaalliibbrraattiioonn SSeettttiinnggss

If two separate axes are used the recommended setting is "Calibrate signal and center index". For applications where two

sensors are used on the same axis or if the index mark is not in the range of motion for one of the encoders, the "Calibrate

signal only" will allow proper calibration of the signal.