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Last modified by Alexander Mott on 2026/05/07 22:32
From version 4.1
edited by Alexander Mott
on 2026/05/07 22:32
Change comment: There is no comment for this version
To version 3.1
edited by Alexander Mott
on 2026/05/07 22:28
Change comment: There is no comment for this version

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1 1  Analog photocells measure light at the photocell and output a 0-10 V DC signal. On GLS-LDL photocells, this signal is output over the orange wire, with the red wire corresponding to 24 V DC input and the black wire corresponding to ground.
2 2  
3 -= Reading is Stuck at 0% or 100% =
3 += Reading 0% in ShowRunnerCLC™ =
4 4  
5 -If an analog photocell (i.e. a 3-wire 0-10V photocell, not a Cresnet or internal occupancy sensor photocell) is correctly defined in the ShowRunnerCLC™ configuration but you see a 0% reading when looking at the photocell in XPanel or running the ##sr show photocell## command, perform the following troubleshooting steps:
5 +If an analog photocell (i.e. a 3-wire 0-10V photocell, not a Cresnet or internal occupancy sensor photocell) is defined in the ShowRunnerCLC™ configuration but you are not receiving a reading when looking at the photocell in XPanel or running the sr show photocell command, perform the following troubleshooting steps:
6 6  
7 7  1. Verify the ShowRunnerCLC™ configuration:
8 8  11. ##Id ##should be a number without quotes matching the dictionary ID (the quoted number at the top of the photocell definition)
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26 26  111. You should see a sensor reading between 10V and 0V, with 0V being the reading when it is covered up. Ideally a second person will be at the photocell to shine a light or cover it up to verify readings are changing
27 27  11. If there is no 24V output, then the host device is probably faulty and you should contact Crestron for troubleshooting or replacement
28 28  11. If there is no 0-10V signal, proceed to troubleshooting at the sensor
29 -11. If there is a reading above 24V then the cabling is incorrect (either the signal is shorted to 24V or the cable actually goes to something other than a photocell, e.g. a non-system occupancy sensor)
30 30  1. Verify signal/power at the sensor:
31 31  11. Verify 24V is reaching the photocell by disconnecting the photocell's red wire and measuring voltage on the cable from the host device
32 32  11. Verify the photocell is outputting a 0-10V signal by disconnecting the orange wire and measuring voltage on the orange wire
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37 37  11. Open loop 60-6000fc (skylight/exterior application)
38 38  11. Closed loop 3-300fc (downward facing photocell)
39 39  
40 -= Reading Reports Inverted =
39 += Inverted Reading in ShowRunnerCLC™ =
41 41  
42 42  Inverted readings in ShowRunnerCLC™ are usually the result of incorrect dip switches at the host device such as a GLS-SIM. This can be corrected without physical access to the host device by changing the ##Invert ##property in the config from ##false ##to ##true##
43 43  
44 -= Reading Reports Higher or Lower than Expected =
43 += Low or High reading in ShowRunnerCLC™ =
45 45  
46 46  If a sensor is reading very high, very low, or is not reacting much to changes in light, the most common causes are:
47 47