I was wondering if i could use the DMX-THRU output on my opto branch-4, as a "5th" output send along with the 4 iso split outputs without causing problems with signal???
Original Post
Hi, I happen to own one of these fine pieces. I can tell you that you can only use the four outputs with the green led to send a dmx signal. The thru plug is for connecting to an additional splitter. Tap
TAP is correct.
However you should have both 3 and 5 pin outputs. If you get a 3 to 5 pin turn around you can actually use all 8 outputs making it an OPTO BRANCH 8. works great.
I realize this is an old thread, but in talking with a pro lighting guy from Nashville last night, I've come to believe that both "tap" and "Elation_Pro" are incorrect about the Opto-Branch 4.

1. You CAN use the DMX Thru port to continue on to other DMX receivers, but standard DMX rules apply (no more than 32 devices on the line, terminate the last fixture on the link, etc). The splitter is just seen as a receiver on the line; nothing more or less.

However, if something takes this line down, all the split lines will go down as well, so it's probably best to limit what is downstream of the Thru port. This is why we opto split in the first place... redundancy.

2. The manual gives every indication that there are only 4 isolators in the unit, not 8. Therefore, using both the 3-pin and 5-pin connectors from a single output actually amounts to using a DMX Y, which is not allowed by DMX standard. This *might* work but could potentially introduce issues.
I have to agree with you stoke. If I had been on the forums when you wrote this, I would have posted otherwise.

You are correct in that the thru port can be used to add other DMX devices, be it dimmers, movers, leds, or another split.

You are also correct in that you can use both the 3 and 5 pin outputs in a pinch on the same 'branch'. I have done it myself a few times, but would not recommend it. It was a last minute add of some equipment and no time to get another split.
2. The manual gives every indication that there are only 4 isolators in the unit, not 8. Therefore, using both the 3-pin and 5-pin connectors from a single output actually amounts to using a DMX Y, which is not allowed by DMX standard. This *might* work but could potentially introduce issues.

This is a good observation.. I am running this up the flag pole with our engineers.

Best regards,
Wow! This is my old thread. I did purchase this unit,and i HAVE used the "Thru" output,and doubled up on the 3 and 5 pin outs with absolutely NO PROBLEMS!!! This box is great because it allows me to split my fixture Stage left/right without having to run cross stage patches for my fixtures reducing the chances of somebody tripping on DMX cables!
Here is an answer I recieved regarding the OPTO branch 4

In regards to the Opto Branch-4 and DMX Branch-4, it should be no problem to use all outputs at the same time. Yes, there are 4 opto-couplers that isolate each output but there are individual DMX drivers for each 3 & 5 pin XLR output connector… 8 total. So it is not the same as using a DMX “Y”.
Wow, with effectively 8 outs, this really puts a lot of value into the box.

I figured it would simply drive both the 5-pin and 3 pin connector, letting people choose what they needed. It's just opto-isolated in banks of 4, not 8. Cool deal.
Elation_Pro, I've got one more question for your engineers, then: do the DMX drivers on the shared iso outputs pass voltage between them? If so, then if one goes out, the other also goes out.

For instance, let's say you have a scroller cable that goes bad. These pass both power and data through the same cable. If it shorts out, you'll be sending a voltage down the data line and probably take everything down on at least that one line. What will happen to the other line on the shared output?
It all depends on the type of voltage being passed through the cable. If it’s low voltage say 8-40VDC, you’d probably never experience more than a single driver going out. If it’s high voltage, then there is a chance that both drivers on the same output could go with the possibility of losing other components within the output circuit.
Hello, i know this is an old thread but rather than start another on i figured i could piggy back onto this one. I recently had a problem with my compuware dongle and from that i learned about using a dmx opto splitter / booster. I ran across 2 elation products that seem to be what i need, just wondering what the difference is between the opto branch 4 and the dmx branch 4 ? Both from elation, the specs on both appear to be the same.
Only obvious difference is one is a single space 19" rack mountable the other is slightly bigger, and mostly the price. Any advice ?
Thanks, Alex
Correct djphenom. They are the same unit, just one is compressed into a single space rack mount. The Opto Branch is rack mountable as well, it comes with the ears. But it takes up two spaces, and the DMX in and thru are on the side as oppose to the front of the unit.
djphenom, more then glad to help and my pleasure.

jingles, no swag yet. But John did help me with something. And you thought I was a girl too? Lol
quote:
Originally posted by SerraAva:
djphenom, more then glad to help and my pleasure.

jingles, no swag yet. But John did help me with something. And you thought I was a girl too? Lol


Oh, you mean ur a guy. I retract my flirtatious statement.
Just kidding - LOL
Thanks again !

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