Anybody know of a DMX like protocol, but that is bidirectional. It would be
nice if it had more addresses, and could have challenge-response with
larger messages, and have a larger number of available addresses than DMX,
but for now, just the distance and being bidirectional are fine. Answers on
a postcard please 
George
Hi George, RDM is an enhanced DMX512 protocol that’s bi-directional. They
use RDM mostly for lighting systems (stage lighting, building architectural
lighting). It was designed to work with legacy DMX devices. Most current
DMX compliant devices just ignore the RDM messages if they don’t understand
them, although some DMX devices (that haven’t quite been properly made to
the DMX spec so they don’t check the start of the message) will try to
interpret the RDM messages as DMX packets which can result in flaky
behaviour.
Jon WilsonOn 18 Jul 2012, at 01:33, DaShroom66 dashroom66@googlemail.com wrote:
Anybody know of a DMX like protocol, but that is bidirectional. It would be
nice if it had more addresses, and could have challenge-response with
larger messages, and have a larger number of available addresses than DMX,
but for now, just the distance and being bidirectional are fine. Answers on
a postcard please
George
You received this message because you are subscribed to the Google Groups
"HAC:Manchester" group.
To view this discussion on the web, visit
https://groups.google.com/d/msg/hacman/-/RclE8f6cbnUJ.
To post to this group, send an email to hacman@googlegroups.com.
To unsubscribe from this group, send email to
hacman+unsubscribe@googlegroups.com.
For more options, visit this group at
http://groups.google.com/group/hacman?hl=en-GB.
Anybody know of a DMX like protocol, but that is bidirectional. It would be
nice if it had more addresses, and could have challenge-response with larger
messages, and have a larger number of available addresses than DMX, but for
now, just the distance and being bidirectional are fine. Answers on a
postcard please
What’s RS485 like for distance?
Kimball
Hi George,On 18 July 2012 01:33, DaShroom66 dashroom66@googlemail.com wrote:
Anybody know of a DMX like protocol, but that is bidirectional. It would be
nice if it had more addresses, and could have challenge-response with larger
messages, and have a larger number of available addresses than DMX, but for
now, just the distance and being bidirectional are fine. Answers on a
postcard please
CAN Bus perhaps:
http://en.wikipedia.org/wiki/CAN_bus
SK Pang does an Arduino shield and I’m sure there will be other hacker
friendly hardware designs.
Regards,
Andrew
Andrew Back
http://carrierdetect.com
What’s RS485 like for distance?
485 will go for kilometers, but the longer the distance the lower the speed.
There’s a Japanese or Chinese power company (I forget which) using 485 on
power lines for communication to remote substations for access control.
Ian.
Ian Norton
Co-Leader North West England Perl Mongers (http://northwestengland.pm.org/)