Troubleshooting
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XB-DMX512 DMX512 Interface
Troubleshooting
Thi section addresses and provides solutions to most frequently asked questions.
AXB-DMX512 Troubleshooting
Problem Solution:
The transmit LED on the DMX512 is
always On. Is this a failure?
• Unlike most serial protocols, the DMX512 transmits a constant
stream of data. This means that since the DMX512 is constantly
receiving data, its receive LED should always be On during that
process.
Some channels will not ramp below a
certain level.
They can be ramped above this
certain level but not below it.
• The DMX512 box contains 3 internal buffers (DIrect, Patch, and
Group) for sending, each with its’ own use. The actual DMX output is
the highest value for that channel from among the group of three.
• EXAMPLE:
If a programmer is ramping channel 1 down in the Direct buffer, but
this channel is at 50% in the Group buffer. The programmer can’t
ramp the actual DMX output below 50%.
To avoid this situation, each of the three buffers should be cleared
out before doing any programming.
• Solution: The Send Commands used to do this are:
DZ - To clear the Direct Buffer
PZ - To clear the Patch buffer
GZ - To clear the Group buffer
MZ - To reset everything (WARNING: This also deletes all Presets)
The AXB-DMX512 is connected
between a lighting console and the
dimmers.
If I bypass the AXB-DMX512 box,
I have control of the dimmers, but
when I put the box in the system,
I have no control.
• The DMX512 box needs to have a patch created to connect the
inputs to the outputs, After issuing the above commands to clear out
any pre-existing patches or groups, send the PA Send Command to
connect all inputs to all outputs (one to one).
The AXB-DMX512 is connected
between a lighting console and the
dimmers. I am using the DS Send
Command to store snapshots of the
DMX outputs.
When I send the DL command to
recall these snapshots, I am affecting
dimmers that I do not want to be
recalled in this scene.
Is there any way to leave certain
channels out of the scene?
• The DS and DL commands store a snapshot of all DMX 512
channels.
• To store and recall scenes, the GP command must be used to
proportionally add a group in the Group buffer. The programmer must
select which channels are included in the group.
• EXAMPLE:
GP1D1-100 adds DMX outputs 1 through 100 to group 1.
The scene can then be recalled by sending the group to 100% using
the command GR1L100%. Channels above 100 will not be affected
by this command.
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