midi and SFX, G-Type, Showman

[Peter]

Yes, i want to build an apple midi network through ethernet. Catalyst will then be controlling arkaos with midi (50-75m max) and powerpoint/keynote with MSC or midi (2m). I wrote MSC over 100m but it's only midi but that's the same principle in running long ethernet cables.

I know it's perhaps a bit complicated to do it like this but the show has already been made with these programs before i had catalyst. So if i have the time i will try to convert everything to that.

I will experiment a bit and let you know. But i cant do the long runs at home.

There are other options like QLab and DLight to get it all working but for the moment i really into cat.

[emilianomorgia]

Yes, i want to build an apple midi network through ethernet. Catalyst will then be controlling arkaos with midi (50-75m max) and powerpoint/keynote with MSC or midi (2m).

What Computer are you using to Run Arkaos and PP/Key ?

Can you provide a diagram ?

[Peter]

What Computer are you using to Run Arkaos and PP/Key ?

Can you provide a diagram ?

To keep it as simple as possible i will run on 3 macs, respecitivly 1 cat, 1PP, 1 arkaos :

Master will be cat (Macbookpro) - Ethernethub - line 1 to PP (powerbook G4/1.5) and line2 to Arkaos (powerbook G4/1.5 with fw800 external drive : only 1 movie playing 640/480 photojpeg 75% of higher). All have tiger on them.

I just tried the cat to PP setup with a utility called midipresenter which allows to send midi programs changes or MSC for controlling PP. With MSC, started in catalyst (internal or with internal relative) it worked fine but this was only the macbookpro connected to powerbook PP. The setup was done over a midi netwerk with a 1m ethernetcable.

Richard : what about the collision thing when working with 3 macs : 1 macs transmits 2 signals. I presume this will be ok?

[samsc]

Richard : what about the collision thing when working with 3 macs : 1 macs transmits 2 signals. I presume this will be ok?

collision nothing to do with short networks.
its to do with the distance limit of ethernet - nothing to do with what you are doing at short lengths.

[Peter]

But the arkaos setup will be 50-75m further or wont that make a difference?

[emilianomorgia]

I just tried the cat to PP setup with a utility called midipresenter which allows to send midi programs changes or MSC for controlling PP. With MSC, started in catalyst (internal or with internal relative) it worked fine but this was only the macbookpro connected to powerbook PP. The setup was done over a midi netwerk with a 1m ethernetcable.

If you wish you don't need to use real midi Cables , I mean you don't need to run midi signal . If I ware you I'll use Midi Network .

Midi network will transmit MIDI OVER NETWORK .
Also you want to create a network for the 3 machine for remote monitoring using tool like Apple Remote Desktop to be able to change files or just Sleep/restart the Macs .

if you have time to spend on this technology you will see that it come handy for many other purpose .

To start with read this

http://www.soundonsound.com/sos/jul0...cles/tiger.htm

[samsc]

Catalyst will then be controlling arkaos with midi (50-75m max) and powerpoint/keynote with MSC or midi (2m). I wrote MSC over 100m but it's only midi but that's the same principle in running long ethernet cables.

Not the same principles-

if you need ethernet to go further reduce the speed to 10MBt
the limit in ethernet is not electrical but protocol itself.
its the collision detection not the electrical issues-
http://www.geocities.com/SiliconVall.../ethernet.html

What is a "collision"?
At any one instance, in an Ethernet network, only one device can transmit. If two devices transmit at the same instance, then the signals from both devices will collide and a "collision" will occur. When a "collision" occurs, the signals will get distorted and the frame will be lost. Collisions are very common in a Ethernet network.

with midi signals the limit is electrical determined by rise time of opto isolators used by midi receivers.
there are no collisions.

The interface operates at 31.25 (+/- 1%) Kbaud, asynchronous, with a start bit, 8 data bits (D0 to D7), and a stop bit. This makes a total of 10 bits for a period of 320 microseconds per serial byte.
Circuit: 5 mA current loop type. Logical 0 is current ON. One output shall drive one and only one input. The receiver shall be opto-isolated and require less than 5 mA to turn on. Sharp PC-900 and HP 6N138 optoisolators have been found acceptable. Other high-speed optoisolators may be satisfactory. Rise and fall times should be less than 2 microseconds.

http://www.repairfaq.org/filipg/LINK/F_MIDI.html