MicroE Mercury II 6000 - Manual (Page 34)

Appendix
IM-Mercury_II_6000 Series Rev. 1 Page 33 ©2014 MicroE Systems
Mercury II 6000 Series Encoders
Installation Manual and Reference Guide
the alignment tool and Smart Precision software. The register must be set using the
following formula:
Register value = (8.19E108 x ST x NC)/CF
ST = the desired speed alarm threshold in m/s
NC = number of clocks between samples
CF = clock frequency in Hz
Register value should be rounded to the nearest integer and entered into the settings
screen in the SmartPrecision software.
The speed alarm may also be disabled in the SmartPrecision software.
CRC bits
The cyclic redundancy check or CRC includes only the position and status bits. The CRC format
is 6-bit polynomial:
X6 + X + 1, MSB first after preloading the CRC register with all 1’s.
Stop Bits
The data word will always end with bits one, zero, one, one (1011).
Timing Diagram