It depends on how you wired your bars with 120 pixels each and on how you are planning to split the DMX universes
A couple of things to check.
On the LeDMX4, to run up to 680 RGB pixels per output you need firmware 3.1+.
Each DMX universe is made of 512 channels.
Based on their documentation, it’s my understanding is that the LeDMX4 can send up to 16 universes, 4 universes for each port.
680 pixels x 3 (RGB) = 2040 channels per port
2040 / 512 = 3.98 aka 4 universes per port
The second thing is that after your shuffle CHOP, you need to make sure that the data is packaged in a way that the pixel board (in your case LeDMX4) can understand, and the pixel board needs to be set up to send data in a way that the pixel bars can understand.
About the DMX universes.
If you have 120 RGB pixels, you will occupy 360 (120x3) DMX channels for the first bar (in universe 0). That means you have 152 DMX channels left in that universe (512 - 360).
152 divided by 3 (RGB) makes 50.6, that might be why you have that strange offset of 50 pixels?
After your shuffle, you need to make sure that the data is packaged correctly, one universe per bar as you mentioned. You can leave those last 152 values “empty”, physically there are no pixels in your bars to receive that data.
Packing up each universe to its maximum (512, or 510 to be precise for RGB pixels) could be done but it usually results in a much more complicated cabling. It’s quite normal to allocate one universe per bar, without using each universe in full, and keeping the cabling as straight forward as possible, in case you need to extend the cabling, moving the bars around etc…
My guess is that you are you are trying to control all bars from one port, sending all universes out of port1? this is probably why you have set a pixel count of 600 out of port 1 (120x5 = 600).
If that’s the case, since you have 5 bars, there is a fair bit of calculations on how to split 4 universes onto 5 bars. It’s possible but the cabling and calculations involved could be confusing.
I would keep it simple and send one universe to each bar, as you mentioned.
You could try: port 1 to control bars 1,2,3,4 , and port 2 to control bar 5.
And then when you will scale up, port 2 to control bars 5,6,7,8, plus port 3 for bars 9,10
Set port 1 and port 2 to pixel count 480 (120x4), and port 3 to 240 (120x2).
Keep that pixel count number always updated to the number of pixels you are using.
The LeDMX4 does its own data packaging and will send data out according to those settings (pixel type, pixel count, null pixel and color order).
If all this doesn’t work (it does conceptually, but I don’t have a LeDMX4 here with me right now to do some tests), you could also try to pack each bar “back to back” in your shuffle CHOP splitting every 510 in case the LeDMX4 sends out data that way out of each port and your bars are daisy chained.
I hope this helps!
if it doesn’t let us know and send a screenshot of your shuffle chop, the dmxout settings and the dmx routing table (DAT).