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Forum: RDM Physical Layer/Hardware Discussion August 5th, 2008
Replies: 7
Views: 12,144
Posted By berntd
Hello I did look for tranzorbs but their...

Hello
I did look for tranzorbs but their breakdown voltage was not good enough at over 4V for most of them. The absolute maximum in my system is 4.0V for the processor.
I will check again.

The...
Forum: RDM Physical Layer/Hardware Discussion August 5th, 2008
Replies: 7
Views: 12,144
Posted By berntd
Hi Eric, I did say 5V originally and I have...

Hi Eric,

I did say 5V originally and I have seen the problem with a 5V external driver driving into my 3V3 master when the master power is dropped suddely during communication. The 5V is then...
Forum: RDM Physical Layer/Hardware Discussion August 4th, 2008
Replies: 7
Views: 12,144
Posted By berntd
Hi Eric and thanks for the reply. To meet...

Hi Eric and thanks for the reply.

To meet the spec, The pullup resistor is actually 390R for a 3V3 supply.
If the dataline is now pulled to +12V (example but perfectly legal) by the responder...
Forum: RDM Physical Layer/Hardware Discussion August 4th, 2008
Replies: 7
Views: 12,144
Posted By berntd
Line biasing Flaws - need solutions

Hello,

The line biasing method in the RDM spec is flawed in my opinion.
The reason is that the voltages on the DMX lines are allowed to rise way further than the power supply that biases the...
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