FIL

Requests/sets value of the IL (Integration Limit) LM628 filter parameter for the specified axis[11].

Mnemonic:

Filter Integration Limit

Syntax:

FIL $<$n$>$[, value]

n: Axis number (0:azimuth, 1:elevation).

value: New integration limit (0 to 32767)

Return values:

Success:

FIL 1, n, value

Failure:

FIL 0[, n], err_msg

n: Axis number.

value: New or current integration limit

err_msg: Should the command fail, this value will be an error message string, explaining the cause of failure. FIL may fail for any of the following reasons:

• The wrong number of parameters were supplied.
• A non-numeric value is provided for any of the parameters.
• The axis number in n is not `0' or `1'.
• The value parameter contains a number that is outside the valid range for the PID filter.

Remarks:

The LM628 PID filters must be properly tuned for the servo systems to work properly. For a detailed discussion on tuning the LM628 PID filter, see ``LM628 Programming Guide (National Semiconductor Application Note 693)''[12]

Example:

     send: FIL 1, 50
  receive: FIL 1, 1, 50

     send: FIL 1
  receive: FIL 1, 1, 50

See also:

FKD, FKI, FKP, FLT, FSI