SRS Labs CTC100, User Manual

Page: 127 / 177

Remote Programming 115
CTC100 Programmable Temperature Controller
Next, select channel DIO and set the following parameters:
Now run the following macro by sending it over a serial port (in which case it all has to be on
one line) or by copying it ont
[
waitForSample
#d = 0
if (#V1>#t) { #d = 1 }
DIO = #d
#t += 1
if (#t>100) { #t = 0 }
]-1
To test the macro, set V1's value to 50 and plot channel DIO. You should see a square wave
with a duty cycle of 50% and a period of 10 seconds: high for 5 seconds, low for 5 seconds, high
for 5 seconds, etc. Reduce V1 to 25 and the duty cycle should go to 25%.
Before the feedback can be used, the PID gain factors will need to be set by using the automatic
tuning feature on channel V1. If tuning is successful, the feedback should now operate normally.
If more than one feedback loop is required, set up channels V2 and/or V3 as described for
channel V1, and add these lines after the { #d = 1 } statement:
if (#V2>#t) { #d+=2 }
if (#V3>#t) { #d+=4 }
The macro can automatically run every time the CTC100 is turned on; just send the command