DMX robust - RDM not? - E1.20 RDM (Remote Device Management) Protocol Forums

sblair · April 15th, 2008

Steve,

This is not surprising at all! The thing that makes DMX so forgiving is the fact that it is spitting the same packet out over and over up to 44 times/second. This masks all types of sins.

RDM by its nature is going to require a better quality infrastructure than what you were able to get away with in the past with DMX. This includes using termination and the right type of cable.

The good thing about this is that RDM will make it much easier to spot all identify and pinpoint all types of intermittent issues that previously would have resulted in random flaky behavior of the fixtures.

svanciel · April 16th, 2008

Quote:

Originally Posted by sblair

This includes using termination and the right type of cable.

True that! With the new InfoTrace Aquarams, we had to add terminators to the fourteen 4-pin lines (power supplies to heads) that never had them with the previous non-RDM units. At least all of the cable was/is the special Wybron four conductor cable, so it is still good for the power and data. Just have to go around to all of the outdoor connector boxes and look for water.

SteveV

derekleffew · May 21st, 2008

Interesting. This just came up on another discussion board. I stated I'd never heard of an A4M with a 120Ω resistor between pins 2&3.

The board received the following answer:

"Ok, so the OFFICIAL response from the Wybron engineering dept is that you should terminate the power supply just like any other DMX fixture. No termination of the scrollers is necessary."
Dusty Hudgins
Sales Manager
Wybron, Inc.
719-884-6480

April 15th, 2008	#1
sblair Administrator Join Date: Feb 2006 Posts: 441	Steve, This is not surprising at all! The thing that makes DMX so forgiving is the fact that it is spitting the same packet out over and over up to 44 times/second. This masks all types of sins. RDM by its nature is going to require a better quality infrastructure than what you were able to get away with in the past with DMX. This includes using termination and the right type of cable. The good thing about this is that RDM will make it much easier to spot all identify and pinpoint all types of intermittent issues that previously would have resulted in random flaky behavior of the fixtures. __________________ Scott M. Blair RDM Protocol Forums Admin

May 21st, 2008	#3
derekleffew Junior Member Join Date: May 2008 Location: Las Vegas, NV, USA Posts: 1	4pin scroller terminator Interesting. This just came up on another discussion board. I stated I'd never heard of an A4M with a 120Ω resistor between pins 2&3. The board received the following answer: "Ok, so the OFFICIAL response from the Wybron engineering dept is that you should terminate the power supply just like any other DMX fixture. No termination of the scrollers is necessary." Dusty Hudgins Sales Manager Wybron, Inc. 719-884-6480