Cue Light Systems

DMX Tester

LogiCue Users

Frequently Asked Questions


What is a cue light system?
A cue light system is a set of indicator lights put backstage for indicating when it is time for actors or crew to do whatever they are supposed to do when the stage manager tells them to do it.
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Why do I need a cue light system if I already have a headset communication system?
There are many times when a cue light system is more convenient.
1. When you are working in a theater where you cannot talk without being heard by the audience.
2 When actors are hearing impaired.
3. When a cue must be given in the middle of the stage behind scenery.
4. When headsets mess up your hair.
5. When headsets are causing a trip hazard and wireless headsets are too expensive.
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Does the LogiCue System use DMX?
No, the LogiCue System uses a proprietary power and digital control protocol to send power and data down 3 wires of standard XLR microphone cable.
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Some of my cue lights are not working correctly. What could be wrong?
With good cables, your cue lights should work with several hundred feet of combined cable. Any bad cables in the system will either prevent the signal from continuing or short out the whole system. It is best to check each cable one at a time. Do not assume a cable is good because it worked for a microphone you plugged in during Woodstock. All three conductors are necessary for the signal to work properly.
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There is a fast clicking noise in my sound system when I turn on my cue light system. What is causing this and how do I stop it?
If all of the microphone lines in your snake have their own ground, you shouldn't have a problem. But, if the ground wires are all shared, then you will have noise. To solve this, provide the cue light signal with its own cable that is not part of the snake. You can tell if your ground wires are tied together by testing continuity between pin 1 of a snake channel and pin 1 of another snake channel.
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How far will the LogiCue signal reach?
Keep the total combined length of the cables to under 1000 feet and the LogiCue System will work great. The total distance the signal can travel depends on the gauge of the wire (we recommend 22 gauge or 20 gauge), the age of the wire, the number of connections, and the conductor material.
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Can I use Cat5/6 cable for my LogiCue System?
Yes, for long runs from the booth to the stage or across the stage, you can. You must use pairs of wires instead of individual strands. For example, use one pair for ground (from xlr pin 1), one pair for voltage (from xlr pin 2), and one pair for signal (from xlr pin 3). Using pairs insures that there will be less loss of signal over a long run because Cat5/6 cable is typically smaller in gauge than standard microphone cable. There are adapters on the market that convert XLR to cat 5/6 ethernet connectors but we have not seen one yet that uses pairs of wires.
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DMX Tester:
Can I use the DXT-1 DMX Tester to check moving lights?
The tester will send level to non-concurrent addresses and maintain those levels while you are in dimmer check mode. The addresses that you are leaving on during the dimmer check mode will stay at the level you left them at until you either "bump through them" (they will reset to zero) or press the "clear" button. The addresses that you want to be left on during dimmer check mode can be below or above the addresses that you are "dimmer checking" (but will reset to zero if you bump through them).
So for testing a moving light, the pan and tilt are usually first. Addresses 1 and 3 on a 16 bit fixture. You could type in [1] [AT] [5] [0] [ENTER] and then [3] [AT] [5] [0] [ENTER], and then [5] [AT] [FULL] (or whatever level you want to "dimmer check" at, it doesn't have to be full). Then when you press [ENTER] a second time, it goes to dimmer check mode and pressing the up or down arrow keys takes you to the next address.
You can also change between viewing and controlling the level as a percentage (0 to 100) or as the DMX value (0 to 255). This helps when troubleshooting very specific things like gobo indexing.
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DMX Tester: Why do the numbers flash when testing cable?
If you are testing three pin cable with five pin adapters, the numbers will flash. As long as "1 2 3" on the top row line up with "1 2 3" on the bottom row, the cable and adapters are wired properly. The reason that the numbers are flashing is that the tester is testing pins four and five as well, not finding any connection, then disconnecting every pin and starting over. The purpose for constantly checking and resetting is so that the tester can detect intermittent connections.
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