User guide

Parameter Dictionary
and the remaining 10 words give the filter coefficients as 32-bit IEEE floating point values. The filter coefficient words are optional and are
only necessary if the firmware is not calculating the coefficients internally.
Word
Description
1
Bits
Usage
0-3 Filter family.
4 If set, filter will not be designed. Always set by firmware after successfully designing the
filter. This prevents the filter from being redesigned when copied from flash at startup.
5-7 Reserved.
8 Number of poles – 1 (i.e. 0 for single pole, 1 for two pole).
9-12 Reserved.
13-15 Filter type.
All reserved bits should be set to zero.
The filter family should be one of the following values:
0 Custom biquad filter. Coefficients must be passed; the firmware will not design the filter.
1 Butterworth filter.
2 Chebychev filter.
3 Elliptic filter.
4-15 Reserved.
The filter type should be one of the following:
0 Custom biquad filter. Coefficients must be passed; the firmware will not design the filter.
1 Low pass.
2 High pass.
3 Band reject (notch).
4 Band pass.
5-6 Reserved
7 Disabled. The filter will have no effect in the system.
If legal values are passed for the filter type and family, the firmware will attempt to
design the specified filter and fill in the coefficient values itself. The firmware is
capable of calculating 1 or 2 pole low pass or high pass filters. For notch and band
Copley Controls Page 75