Watlow 8PID Controller - Manual (Page 33)

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To pre-set the integral sum value:
I(n)S(abcde)CR I is the Integral indicator
n is the loop number 1 to 8
S is integral sum indicator
abcde is the value from 0 to 65536
Normally this is set to 0 when control is first started. Although the integral sum can be
negative in the calculation it can only be preset positive.
Example:
Command: I2S00000CR sets integral sum to 0
Response: I2+00000CRLF
To query the integral sum value:
I(n)QCR
To set the derivative (rate) value:
T(n)D(abcd)CR T is the time indicator
n is the loop number 1 to 8
D is the derivative indicator
abcd is the value from 0000 to 0255 sec.
Example:
Command: T4D0020CR sets rate to 20
Response: T4D0020CRLF
To query the derivative value:
T(n)DQCR
To set the digital filter on the control output
D(n)F(a)CR D is the digital filter command
n is the channel number 1 to 8
F is the filter indicator
a is the filter value 0 to 15
Increasing the number provides additional filtering of the control output (slows the
control response). The calculated control output for the last update is averaged with up to
15 times the previous output depending on the value entered for the digital filter. Digital
filter values greater than 9 are entered by higher single character ASCII values as
follows: