Facts and Information about DMX Cables

First of all, there is no such thing as “DMX 512 Cable”. There are cables that meet DMX 512 cable requirements in terms of capacitance and impedance. Generally, any Cat 5 or EIA485 will do. Basically you can use your computer Ethernet/LAN cable for DMX (but you know… don’t…).

DMX 512 Cable should be shielded twisted pair with characteristic impedance of 120 Ohms. Shielded cables are good practice (especially if there are power cables in near proximity), but in most cases they are not requirement, because twisted pair design is good at the noise rejection.

So I should never use standard microphone cable?

Well... Yes... and No...

You can try to use microphone cable and in "most" cases it will work... probably. However, longer the cable, less chances it will work correctly. For small number of DMX devices, on short distances, with consoles that don't have full DMX refresh rate you can probably work with standard 3pin XLR with microphone cable...