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Last modified by Alexander Mott on 2026/05/07 22:32
From version 1.1
edited by Alexander Mott
on 2026/05/07 19:57
Change comment: There is no comment for this version
To version 2.1
edited by Alexander Mott
on 2026/05/07 22:21
Change comment: There is no comment for this version

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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:
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™ =
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 +
3 3  1. Verify the ShowRunnerCLC™ configuration:
4 -11. ID should be a number without quotes matching the dictionary ID (the quoted number at the top of the photocell definition)
8 +11. Id should be a number without quotes matching the dictionary ID (the quoted number at the top of the photocell definition)
5 5  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
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
6 6  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)
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
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
11 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)
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 +1. k the jumpers/switch at the photocell to make sure the reading is in the correct range:
44 +11. Open loop 3-300fc (default)
45 +11. Open loop 30-3000fc (bright windows)
46 +11. Open loop 60-6000fc (skylight/exterior application)
47 +11. Closed loop 3-300fc (downward facing photocell)
48 +
49 +