Renishaw RCU10, Installation And User Manual, Page: 59 / 202

4-10 System installation
Sample Rate: Selects the rate at which the RCU10 samples the quadrature
signal from the encoder. The default value is 2.5 MHz. See
configuration warning 3 on page 4-12.
Reference Mark Selects the source for the reference mark signal between:
source:
Encoder – uses the reference signal (Z, /Z) from the encoder
connector, in RS422 format.
External Port – uses the RCU10’s J4 – reference switch port.
Compensation
These settings are used to select which modes of compensation are enabled on the
RCU10 hardware.
Air Refractive Index: Selects the air refractive index compensation algorithm
required for laser axes (if applicable).
Encoder Compensation: Selects the linear encoder expansion compensation algorithm
required for tape/glass scale axes (if applicable).
Workpiece Thermal: Selects the workpiece thermal expansion compensation
algorithm.
Structure Thermal: Selects the machine structure thermal expansion
compensation algorithm.
Output to Controller
Signal Format: Selects the format of the feedback signals that are output by
the RCU10; either:
Digital RS422 format A quad B signals, or
Analogue 1 Vpp sinusoidal (Sine/Cos) signals.
Resolution: Selects the RCU10 feedback signals' output resolution
value. Refer to section 2.4.2 for a table of valid input/output
resolution combinations. See configuration warning 1 on
page 4-12.
Direction sense (output): Sets the output quadrature direction. This may be used to
obtain the correct direction sense for the machine control.
See configuration warning 2 on page 4-12.
Update Rate: Selects the rate at which the output quadrature is ‘clocked’.
This setting represents the maximum frequency that can be
seen at the RCU10 output. Care should be taken that the
controller can accept the frequency selected. The default
setting is 2.5MHz. See configuration warning 3 on page
4-12.