Anybody ever do any Lighting control over Art-Net? It's a DMX over Ethernet control protocol. I'm trying to jump start here instead of pouring through pages and pages of Protocol manuals
My preference is sACN(streaming ACN). Most equipment that can act as an Artnet node can also act as a sACN node. The protocol is much simpler and is a more standardized schema.
On the Artnet side, there's a whole IP Schema, then a poll/response set that happens before the DMX information is broadcast. It's pretty involved to initialize that connection. To make my module for it, I had to trudge through the protocol and DEFINITELY didn't implement the whole thing. Just got it working.
Take a look at sACN - it'll probably suit your needs more.
sACN you open up a multicast socket and start broadcasting packets at a regular interval. It's a large header and then the DMX values. You should be able to get it up and going super fast.
This ought to get you going. It's pretty simple. The documentation is a bit vague, especially about byte order.
I use it to control 4 LED par cans using a cheap ArtNet to DMX converter from China.
I needed to send ArtNet packets at least every 0.5s or the lights go dark. This is an issue with non-compliance of the gateway and the lamps rather than an issue with ArtNet.
When my module is idle it sends a DMX packet every 0.5s and when the DMX levels are changing every 50ms.
So,My original project that needed this has probably changed... Or it might change back to AMX control via Art-Net. still not sure. But after that one I just did another project where they forgot a DMX interface and went with the Art-net node to DMX. Got that done yesterday, and thanks clintonl for the code block. worked just fine.
What I found out about Art-net: 1) The default IP stuff described in the protocol is only relevant if you don't have a node with a specific IP Address. If you can setup your node, then it is just UDP packets to that address on port 6454. 2) You don't need the Art-Net Poll messages unless you are looking to find art-net nodes on the network. I was able to just start sending artnet dmx commands out to the box with no problems. 3) if you want to query - the art-net poll response is sent back on the broadcast address for the sub net, in my case that was 192.168.255.255. I happened to have wiresharck running and caught the polling responses.
Hi there i've got a huge problem to poll und send the commands to the node.
i dont understand how i could send the correct code to ramp up the dmx dimmer on channel x.
i implemented the code from clintonl and opend a ip client via udp broatcast on port 6454 ip 2.52.255.255
and send the Artpoll in a timeline.
then send a string with artdmx.
Can you help me?
Comments
On the Artnet side, there's a whole IP Schema, then a poll/response set that happens before the DMX information is broadcast. It's pretty involved to initialize that connection. To make my module for it, I had to trudge through the protocol and DEFINITELY didn't implement the whole thing. Just got it working.
Take a look at sACN - it'll probably suit your needs more.
I use it to control 4 LED par cans using a cheap ArtNet to DMX converter from China.
I needed to send ArtNet packets at least every 0.5s or the lights go dark. This is an issue with non-compliance of the gateway and the lamps rather than an issue with ArtNet.
When my module is idle it sends a DMX packet every 0.5s and when the DMX levels are changing every 50ms.
define_constant
ARTNET_HEADER[] = 'Art-Net';
ARTNET_VERSION[] = {$00,$0E};//14
ARTNET_OPCODE_POLL[] = {$00,$20};
ARTNET_OPCODE_POLL_REPLY[] = {$00,$21};
ARTNET_OPCODE_DMX[] = {$00,$50};
define_variable
volatile char cSequence;
volatile char cSubNet;
volatile integer nUniverse;
volatile char cDMXLevels[512];
define_function ArtPoll()
{
stack_var char _sPacketHeader[18];
_sPacketHeader = "ARTNET_HEADER,$00, // Protocol header
ARTNET_OPCODE_POLL, // ArtDMX op-code
ARTNET_VERSION, // Version 14
$02, // TalkToMe
$00"; // Diagnostic priority
send_string dvSocket, "_sPacketHeader";
}
define_function ArtDMX()
{
stack_var char _sPacketHeader[18];
stack_var char _sPortAddress[2]
_sPortAddress[1] = type_cast(nUniverse & $00FF);
_sPortAddress[2] = type_cast((nUniverse & $7F00) >> 8);
_sPacketHeader = "ARTNET_HEADER,$00, // Protocol header
ARTNET_OPCODE_DMX, // ArtDMX op-code
ARTNET_VERSION, // Version 14
cSequence, // Packet sequence
$00, // Physical port
_sPortAddress[1], // DMX Universe (low 8 bits of 15 bit address)
_sPortAddress[2], // DMX Net (High 7 bits of 15 bit address)
$02,$00"; // Payload length (512 channels)
set_length_array(cDMXLevels, 512);
send_string dvSocket, "_sPacketHeader,cDMXLevels";
cSequence++;
}
Just confirming - you sent stuff out UDP on port 1936? (That might be hex - Manual references it as 0x1936)
DMX is 16-bit, so the best way to deal with it is a 16-bit var, IE a char.
A CHAR is only an 8 bit data type, unsigned 0-255. INTEGER is 16 bit.
Like I said....
DMX is only an 8-bit var, IE a char.... this is what I get for lack of sleep...
What I found out about Art-net: 1) The default IP stuff described in the protocol is only relevant if you don't have a node with a specific IP Address. If you can setup your node, then it is just UDP packets to that address on port 6454. 2) You don't need the Art-Net Poll messages unless you are looking to find art-net nodes on the network. I was able to just start sending artnet dmx commands out to the box with no problems. 3) if you want to query - the art-net poll response is sent back on the broadcast address for the sub net, in my case that was 192.168.255.255. I happened to have wiresharck running and caught the polling responses.
Hi there i've got a huge problem to poll und send the commands to the node.
i dont understand how i could send the correct code to ramp up the dmx dimmer on channel x.
i implemented the code from clintonl and opend a ip client via udp broatcast on port 6454 ip 2.52.255.255
and send the Artpoll in a timeline.
then send a string with artdmx.
Can you help me?