Theoretical knowledge:
Because Artnet generally uses broadcast for polling transmission, the bandwidth requirements are very high, For example, if MA2 opens all 256 domains, Ideally, the bandwidth required is 256 x (530 + 42) x 8 x 33 = 38658048, the minimum requirement is 38Mbit bandwidth, and in fact there are other data transmitted on the network, which is not enough.
Challenges:
SL04 box built-in is full-speed USB,The bandwidth is 12M, the virtual network card also needs other extra bytes overhead, the real use is less than 9M in network data transmission, the built-in LAN PHY is 10M, If all the data of the 256 universe is sent to the box, the box can’t be processed, so please set the number of universe according to the actual number of boxes, please close the universe if you don’t use it, so that the universe that is not used will not send data to the network.
For example, MA2 opens 8 universe by default, If only 1 SL04 box (4 universe) is connected, change the universe to 4 and close the extra 4, delay set to 5ms, total is 4×5=20ms, 1000/20=50Hz, above dmx512 max refresh rate 44Hz, and the general refresh rate will not be set so high, generally set to 30~33Hz.
way 2:
Or connect to the switch (router) through the 100M or 1000M network card of the computer itself, and then connect the box to the switch (router), and the box is only used as a slave, so it can also be.
Note: If the computer network card is directly connected to the SL04 box, all 256 universe will be sent to the box, it is only transferred through the computer network card.
way 3:
Use unicast, not use broadcast, artnet data only to send devices with the corresponding IP address.
Note: If you just want to crack the 256 universe and open the 131072 parameter, you can ignore this bandwidth requirement, because the amount of data transmitted is very small and can be completely ignored.