PRG DMX Reference Guide 5.4 - Manual (Page 93)

DMX512 REFERENCE GUIDE 85
If the luminaire is hung properly, you may have a "flipped focus." In order to avoid a "flipped focus" (when one or more
fixtures move differently from others in the system), begin all preset focuses (a group of channels representing the pan
and tilt values for a particular stage position) from zero position or "50/50" (pan and tilt values at 50%). This "50/50"
can be stored as a group, and can be recalled before recording any other fixture’s focus information.
Also remember that the luminaires will take the shortest path from one position to the next; in DMX512, this is the path
described by the change in value per channel from one position to the next. In order to ensure consistent movement
from luminaire to luminaire in the cueing structure, tilt each fixture first before moving the pan channel. In most cases,
it is best when luminaires pan less than 180° from one focus position to another, allowing for smoother and more
consistent transitions between cues.
Why do my VL6 color wheels get stuck during playback?
Allow a cue to complete before advancing to the next cue. Rushing or "stepping on" cues sends a confusing update
of DMX512 information to the luminaire.
I can control the VL5 luminaire but not the dimmer.
Ensure that the remote dimmer is patched to the proper control channel for the luminaire. If there is an SPC-36
controlling C3 dimmers, check its power, thumbwheel address and all cables between it and each SixPack chassis.
Also, ensure that the SPC-36 controller and dimmer are seeing a proper DMX512 signal.
My lights are flickering or moving erratically.
Make sure that the DMX512 lines from the console are not bundled with or run next to your feeder or other high
voltage cable. If the DMX512 line must cross power cable, make sure it crosses at a 90° angle to the power cable for
the best performance.
I checked my cable, but I still get flickering lights.
Check each DMX512 device for termination. Only the last device on any DMX512 line must be terminated. Over
termination in your system can cause bad signal to reach the lights and dimmers causing them to flicker.
I checked for termination, but my lights still flicker.
Check your DMX512 network. DMX512 signal is best run as a "daisy chain" from one device to another. If your system
is sufficiently large, or your luminaires are spread out over a considerable distance, you may be using an splitter (or
opto-isolator) to safely create a "star pattern" of isolated DMX512 runs. Again, be sure to terminate the last device on
any DMX512 run. A splitter can eliminate ground loop problems that may cause flickering.
My network is good, but I still have problems.
Try replacing each DMX512 cable one at a time to see if there is a bad cable in your system.
My network is good, but my lights still flicker.
Use a DMX512 tool (DMX512’ster, GAM Check or equivalent) to monitor the output of your console. If the data coming
from the console is bad, the entire system may flicker.
Terminate Here
From Console