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4 analog (control) output – Watlow 8PID Controller User Manual

Page 34

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29

Digital Filter

ASCII character

0

0

1

1

2

2

3

3

4

4

5

5

6

6

7

7

8

8

9

9

10

:

11

;

12

<

13

=

14

>

15

?

Example:

Command: D3F4CR

sets digital filter level 4 for loop 3

Response: D3F4CRLF

To query for the digital filter value:

D(n)QCR

7.4 ANALOG (CONTROL) OUTPUT

To set the analog output and suspend PID control:

O(n)V(abcd)CRO is the output indicator

n is the loop number
V is suspend control indicator
abcd is the value 0 to 1023.

The output level can be set independently for each loop and used for open loop control.
With control suspended the output does not have to be related to input in any manner.

The output level can only be set when control is suspended, sending this command with
the "V" will suspend control and set the value. The controller is always computing the
proper control output and therefore control can be switched on at any time with the
following command.

The full scale output is 1023, or slightly better resolution than 0.1%.

The command can be repeated as needed to change the output level to any value desired.