āOn the other side, for the rail light you should be able to plug in a power supply anywhere from 5-24V and then the ārailā output plug will route that power supply to the power strip, meanwhile the signal will still be 5V and coming from the SLB but should still be compatible even if the strip isnāt 5Vā
I just plugged in a power supply of 15V and connected 60 led strip to the rail output. I set 665 to 60. When I fired everything up, the led stip fried very quickly. I checked the voltage at the rail output on the SLB and it was 15V, not 5.
Can someone confirm that this is normal or is my board defective?
The way the rail LED output works on the SLB is that the external power is fed to the power pin on that header. It is fed directly, it will be whatever voltage you connect to it. This is to allow you to use 5V, 12V or 24V programmable LEDs on the rail output. When Chris is referring to 5V in the quote I think he is referring to the signal voltage of the LED pulse waveform, which is always buffered 5V. Hope that makes sense. To use a 15V supply youād need to use a 15V set of LEDs.
@drewnabobber Tks much. That certainly reflects my experience. I know nothing about pulse waveforms. So, in my ignorance, I read Chrisā comment to say that the SLB was performing a voltage regulator function. I should have measured the rail output before frying $30 worth of LEDs. Lesson learned. I believe that I can live without LEDs on my CNC.
@chrismakesstuff Tks, Chris. I may be the only one that did not understand the current wording.
Speaking of rail leds, what does the value input into $665 do? Hereās why I ask. This morning, a buddy gave me a strip of 40 WS2812B leds. I bought a 5v 3A power supply. When I hook everything up and set 665 to 41, on startup, all the leds are white. When I press the e-stop, all are red. However, when I run a job, they flash green for a nanosecond, then go to just off white. When I click the gui stop, the SLB turns red, but the leds do not. They stay a reddish off white.
When I set 665 to 48, white is white and green is green. Estop is red. GUI stop is still not red.
I could keep playing with the value in 665, but I figure that I need a better understanding of what it is doing so that I donāt damage the SLB or fry some more leds.
Grant, at risk of stating the obvious, is the SLB set up for RGB strings? Or does it communicate with the string via a data line? Or does the factory strip just contain white LEDs?
@CrookedWoodTex It is setup to use led strips with individually addressable leds. The idea is that you can connect an led strip to the rail output and those leds will mimic the leds on the SLB. That way, I can see the status of the SLB leds without having to contort myself to see the SLB itself. The firmware has a setting that is to be set to the number of leds that are in the strip. I am simply trying to learn what that setting actually does in terms of output from the rail plug.
Ok. Got it. I use that style of LEDs, but there are at least two popular protocols to address them. Of course they arenāt compatible. Sienci will have to notify you which protocol is in use.
Hi all, updates to the docs are out now after I tried to digest everyones feedback and distill it down to be hopefully concise and understandable. Please anyone who previously ran into some roadblocks Iād really appreciate if you gave the LED section another read-over and let me know if there are still any other outstanding aspects that you donāt understand.
One last update on this thread, I made a couple more tweaks to the docs on LED light hookup, voltage, recommended strips, etc so now it should completely cover most info needed for someone to do this themselves. In light of this, I think Iāll close this thread now and if new questions arise feel free to open new ones!
So, in my ignorance, I read Chrisā comment to say that the SLB was performing a voltage regulator function. I should have measured the rail output before frying $30 worth of LEDs. 
Lesson learned. I believe that I can live without LEDs on my CNC.