A bit belated, and definitely long-winded, but possibly of help to others. The term 'socket' as used in the E682 setup can be confusing because we think of a 'socket' as a physical electrical connector. In this case 'socket' is a networking term that refers to a "virtual" connection, an imaginary wire that carries one universe of DMX data from our show PC to the E682. The E682 supports 6 sockets, or 6 DMX universes. The first step in configuring the board is to determine which universes your board needs to respond to. Typically, but not always, these will be sequential universe numbers, and typically, but not always, the first controller will start with universe number 1. Once you have identified which universes you need, you use the UNiverse command to map those 6 universe numbers to the E682s sockets S1 thru S6. Let me give an example of configuring 2 E682s for a total of 32 50-pixel strings, beginning at universe 1 channel 1, with all pixel addressses being assigned contiguously (no gaps). Since we start with universe 1, we will map the first 6 DMX universes to the first controller. This is actually the default configuration that ships with the controller, so we don't have to change anything, sockets 1-6 will already be mapped to universes 1-6. What this is telling the controller is that those 6 virtual DMX wires between our PC and the E682 are bringing in universes number 1 thru 6 to this E682. If we did have to do this manually we would type 6 UNiverse commands: UN 1 1, UN 2 2, UN 3 3, UN 4 4, UN 5 5, UN 6 6 (and of couse we would end with a SAVE 0!) Now the 2nd step of configuring an E682s addresses is to map the individual clusters of pixel strings to those 6 sockets (and by doing that we are mapping them to the DMX universes that are assigned to those sockets). Again, since this is board number one,and our configuration matches the factory default, we don't have to do anything. Cluster 1 starts with socket 1 channel 1 and runs thru socket 2 channe 90. This is a total of 600 DMX channels (510 in the first universe <remember 511 and 512 are NEVER used> and 90 in the 2nd, total 600). 600 channels = 4 strings * 50 pixles * 3 channels per pixel. Cluster 2 begins at 2-91 and runs thru 3-180. Cluster 3 begins at 3-181 and runs thru 4-270, and cluster 4 begins at 4-271 and runs thru 5-360. So, even though we've assigned universes 1-6 to the 6 DMX sockets on this board, as it turns out we're only using the first 5. Now, let's continue with our remaining pixels on the 2nd E682, and this is where it gets interesting. First we need to decide which 6 universes to map to our 6 sockets on the 2nd E682. Remember, we only used a portion of universe 5 on the first controller, and we want all of our addresses to run with no gaps, so the 2nd controller will begin by using the last part of universe 5. That means controller #2 will be mapped to DMX universes 5 thru 10. To do that we use the UNiverse command: UN 1 5, UN 2 6, UN 3 7, UN 4 8, UN 5 9, UN 6 10. (I have typed that as 1 long line whereas when actually entering those commands each would be on its own line.) This would be a good time to point out that YOU SHOULD NEVER DUPLICATE A UNIVERSE NUMBER when mapping sockets to universes. Start out with the specific universe numbers that you need, and if you don't need all 6, then just map the unused ones to the next universe numbers in order. OK, now we will set the DMX start addresses for the clusters on the 2nd E682. The first board ended with cluster 4 using up thru socket 5 (universe 5) channel 360. So, the 2nd E682 should start with universe 5 channel 361. Remember we enter the DMX addresses as socket numbers 1-6, not universe numbers, so we will use the command: DMX 1 1 361 to set the first dmx address of the 1st cluster to Socket 1 channel 361. Since socket 1 on this board is mapped to universe 5 this will give us the result we want, a start address of universe 5, channel 361. Cluster 1 will run from 1-361 to 2-450. So we use the command DMX 2 2 451 to assign socket 2 (univ 6) chan 451 thru socket 4 (univ 8) chan 30, to the 2nd cluster. Notice here that this cluster actually uses 3 universes, parts of universes 6 and 8, and all of universe 7. DMX 3 4 31 sets cluster 3 to use 4-31 thru 5-120, and DMX 4 5 121 sets cluster 4 to use socket 5 chan 121 thru socket 6 channel 210. (If you notice, it's easy to know what address to use in the DMX command because we just go 1 more than the ending address of the previous cluster). And please don't forget to SAVE 0 when done... As a check, board #2 uses chans 361 thru 510 of universe 5 (150 channels), all of universes 6 thru 9 (2040 channels) and 210 channels of universe 10, for a total of 150+2040+210=2400 channels. And the 2 boards together use a total of 4800 channels (all of universes 1-9 = 9*510=4590 plus 210 of universe 10, total 4800). 4800 channels = 1600 pixels, so everything seems right.