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Last modified by Alexander Mott on 2026/05/07 22:32
From version 2.1
edited by Alexander Mott
on 2026/05/07 22:21
Change comment: There is no comment for this version
To version 4.1
edited by Alexander Mott
on 2026/05/07 22:32
Change comment: There is no comment for this version

Summary

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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 0% in ShowRunnerCLC™ =
3 += Reading is Stuck at 0% or 100% =
4 4  
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:
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:
6 6  
7 7  1. Verify the ShowRunnerCLC™ configuration:
8 -11. Id should be a number without quotes matching the dictionary ID (the quoted number at the top of the photocell definition)
9 -11. Model can be "GLS-LDL", "GLS-LOL", "GLS-LCL", or "GLS-LEXT" for non-system sensors
10 -11. HostDevice should be the model name in quotes for the device the photocell is wired to (GLS-SIM, ZUMLINK-JBOX-16A-LV, ZUMNET-JBOX-16A-LV, etc.)
11 -11. HostPort will be "1" without quotes for most devices. Exceptions are:
12 -111. GLS-SIM or C2N-CBD-P where the photocell is connected to port 2 will be "2" without ports
8 +11. ##Id ##should be a number without quotes matching the dictionary ID (the quoted number at the top of the photocell definition)
9 +11. ##Model ##can be "GLS-LDL", "GLS-LOL", "GLS-LCL", or "GLS-LEXT" for non-system sensors
10 +11. ##HostDevice ##should be the model name in quotes for the device the photocell is wired to (GLS-SIM, ZUMLINK-JBOX-16A-LV, ZUMNET-JBOX-16A-LV, etc.)
11 +11. ##HostPort ##will be ##1## for most devices. Exceptions are:
12 +111. GLS-SIM or C2N-CBD-P where the photocell is connected to port 2 will be ##2##
13 13  111. GLPAC will correspond to the number of the dedicated photocell port that the photocell is connected to (1-4)
14 -11. DeviceHostId is the IP-ID in quotes for the host device or "null" without quotes if connected to a device without an IP-ID (e.g. a GLS-SIM connected directly to the processor)
15 -11. DevicehostBranch is "1" without quotes for most devices, with the exception being devices on DIN-CENCN-2 net 2 where the DeviceHostBranch will be "2" without quotes
16 -11. DeviceConnectionId will be the hexadecimal CID (Cresnet ID) of the host device in quotes
14 +11. ##DeviceHostId ##is the IP-ID in quotes for the host device or ##null## without quotes if connected to a device without an IP-ID (e.g. a GLS-SIM connected directly to the processor)
15 +11. ##DevicehostBranch ##is ##1## for most devices, with the exception being devices on DIN-CENCN-2 net 2 where the ##DeviceHostBranch ##will be ##2## and devices directly on a processor where it will be ##0##
16 +11. ##DeviceConnectionId ##will be the hexadecimal CID (Cresnet ID) of the host device in quotes
17 17  1. Verify the photocell is connected to the correct device (compare serial numbers to ensure the IP-ID, CID, and model match of the host device matches the configuration)
18 18  1. Verify wiring at the host device:
19 19  11. For ZUMNET/ZUMLINK-JBOX the photocell should be using ports 4, 5, and 6 on the green terminal block, corresponding to 24V (red at the photocell), signal (orange at the photocell), and ground (black at the photocell)
... ... @@ -26,10 +26,11 @@
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)
29 29  1. Verify signal/power at the sensor:
30 30  11. Verify 24V is reaching the photocell by disconnecting the photocell's red wire and measuring voltage on the cable from the host device
31 31  11. Verify the photocell is outputting a 0-10V signal by disconnecting the orange wire and measuring voltage on the orange wire
32 -11. If you get a reading at the photocell but not at the JBOX then there is likely a wiring issue, i.e. wrong cable connected or the cable is damaged in the field
33 +11. If you get a reading at the photocell but not at the host device then there is likely a wiring issue, such as the wrong cable or wire is connected or the cable is damaged in the field
33 33  1. Check the jumpers/switch at the photocell to make sure the reading is in the correct range:
34 34  11. Open loop 3-300fc (default)
35 35  11. Open loop 30-3000fc (bright windows)
... ... @@ -36,11 +36,16 @@
36 36  11. Open loop 60-6000fc (skylight/exterior application)
37 37  11. Closed loop 3-300fc (downward facing photocell)
38 38  
39 -= Inverted Reading in ShowRunnerCLC™ =
40 += Reading Reports Inverted =
40 40  
41 -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
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##
42 42  
43 -1. k the jumpers/switch at the photocell to make sure the reading is in the correct range:
44 += Reading Reports Higher or Lower than Expected =
45 +
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 +
48 +1. The photocell is installed incorrectly (i.e. the location is too far from a light source, the view of the light source is obscured, or the photocell is installed facing away from the light source)
49 +1. The jumpers or switch on the photocell (depending on whether the photocell is rated for wet locations or not) are set to the incorrect range for the installation location. The available options are:
44 44  11. Open loop 3-300fc (default)
45 45  11. Open loop 30-3000fc (bright windows)
46 46  11. Open loop 60-6000fc (skylight/exterior application)