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Last modified by Alexander Mott on 2026/05/07 22:32
From version 3.1
edited by Alexander Mott
on 2026/05/07 22:28
Change comment: There is no comment for this version
To version 1.1
edited by Alexander Mott
on 2026/05/07 19:57
Change comment: There is no comment for this version

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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.
1 +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:
2 2  
3 -= Reading 0% in ShowRunnerCLC™ =
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:
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## 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 -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## 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
4 +11. ID should be a number without quotes matching the dictionary ID (the quoted number at the top of the photocell definition)
5 +11. Model can be "GLS-LDL", "GLS-LOL", "GLS-LCL", or "GLS-LEXT" for non-system sensors
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 -1. Verify wiring at the host device:
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)
20 -11. For GLS-SIM, there are two ports with two dipswitches each:
21 -111. Dip switches 1 and 2 correspond to port 1 while switches 3 and 4 correspond to port 2
22 -111. Dip switches are all in the on (up) position from factory, but photocells should have the dip switches for their port set to on-off (up-down)
23 -1. Verify signal/power at the host device:
24 -11. Verify the host device is outputting 24V on the correct port
25 -11. Verify you are receiving a 0-10V signal at the host device by disconnecting the signal wire and measuring its voltage to ground
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 -11. If there is no 24V output, then the host device is probably faulty and you should contact Crestron for troubleshooting or replacement
28 -11. If there is no 0-10V signal, proceed to troubleshooting at the sensor
29 -1. Verify signal/power at the sensor:
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 -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 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 -1. Check the jumpers/switch at the photocell to make sure the reading is in the correct range:
34 -11. Open loop 3-300fc (default)
35 -11. Open loop 30-3000fc (bright windows)
36 -11. Open loop 60-6000fc (skylight/exterior application)
37 -11. Closed loop 3-300fc (downward facing photocell)
38 -
39 -= Inverted Reading in ShowRunnerCLC™ =
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 -
43 -= Low or High reading in ShowRunnerCLC™ =
44 -
45 -If a sensor is reading very high, very low, or is not reacting much to changes in light, the most common causes are:
46 -
47 -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)
48 -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:
49 -11. Open loop 3-300fc (default)
50 -11. Open loop 30-3000fc (bright windows)
51 -11. Open loop 60-6000fc (skylight/exterior application)
52 -11. Closed loop 3-300fc (downward facing photocell)
53 -
54 -
7 +1. Verify wiring at the JBOX – should use ports 4, 5, and 6 corresponding to 24V (red at the photocell), signal (orange), and ground (black)
8 +1. Verify the JBOX is outputting 24V and that you are seeing a reading at the JBOX by (disconnect the signal wire and measure voltage to ground)
9 +11. You should see a sensor reading between 10V and 0V, with 0V being the reading when it is covered up
10 +11. If no reading at the JBOX, move to the photocell and measure 24V off the cable from the JBOX and measure signal directly off the orange lead at the photocell
11 +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
12 +1. Check the jumpers/switch at the photocell to make sure the reading is in the correct range (the options are low range open loop ~~3-300, mid range open loop ~~30-3000, high range open loop ~~3000-30000, and closed loop: default is mid range open loop)