The importance of termination

[zbang]

My friend *hobbit* has a habit of analyzing and writing about seemingly innocent things, like a stage lighting DMX splitter box...

DMX512 is a standard for stage lighting controls; it's RS-485 at 250 kbps and has instructions for terminating lines, using splitters, etc. It's designed go be easy to set up. It also attracts cheap components because it usually works.

So, *hobbit* decided to look at the effects of termination, bias, and slew rate, on the signal and did up a nice web page showing all about these things. If you work with RS-485, pay attention to what he's written, especially at higher speeds.

 

[donaldelectrician]

My friend *hobbit* has a habit of analyzing and writing about seemingly innocent things, like a stage lighting DMX splitter box...

DMX512 is a standard for stage lighting controls; it's RS-485 at 250 kbps and has instructions for terminating lines, using splitters, etc. It's designed go be easy to set up. It also attracts cheap components because it usually works.

So, *hobbit* decided to look at the effects of termination, bias, and slew rate, on the signal and did up a nice web page showing all about these things. If you work with RS-485, pay attention to what he's written, especially at higher speeds.

I have always liked Stage Lighting Design . Never got to work with stage lighting except once . Our little town , put on a show , with all locals .
Our town was 200 to 300 people year round . Summer pop could swell with the valley people coming to the beach .

We used coffee cans made into spot lights with gels and made a dimmer board of ... well dimmers and switches . I Loved our town and ran the lights .

The name of our play was ... Ready ... OUR TOWN .




Don

 

[JoeStillman]

I wish the DDC, PLC and especially the Fire Alarm network designers would get their act together like the DMX and MIDI committees did. The easy plug-and-play interoperability resulted in more sales for everybody instead of customer-for-life proprietary exclusiveness.