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Forum: RDM Interpretation Questions September 2nd, 2011
Replies: 8
Views: 8,927
Posted By dangeross
Just my two cents worth but I do a lot of work...

Just my two cents worth but I do a lot of work with fountains and a lot of it is bit addressed devices. So I propose considering push the sub device limit out to 4096 in the next revision. I feel...
Forum: RDM Physical Layer/Hardware Discussion September 26th, 2010
Replies: 2
Views: 7,297
Posted By dangeross
Crossed wires

You will have to be able to recognize bad data as the result of crossed wires but these http://focus.ti.com/docs/prod/folders/print/sn65hvd1794.html will let you swap wires on chip.
Forum: RDM General Implementation Discussion January 18th, 2010
Replies: 19
Views: 10,987
Posted By dangeross
I agree I would want the IDENTIFY_DEVICE to On...

I agree I would want the IDENTIFY_DEVICE to On until turned Off or the device is reset via RDM/Local Panel/Power Cycle. I would want the controller to keep track of which devices it has set...
Forum: RDM General Implementation Discussion October 16th, 2009
Replies: 6
Views: 5,940
Posted By dangeross
The only possible problem I see with using DMX...

The only possible problem I see with using DMX personalities is that if in the future you add more channels, frequencies, or current settings you could easily find yourself exceeding the 8-bit limit...
Forum: RDM Timing Discussion July 6th, 2009
Replies: 4
Views: 7,048
Posted By dangeross
E1.20 - 2006 states in section 3.2.1 Responder...

E1.20 - 2006 states in section 3.2.1 Responder Packet Timings "RDM responders shall conform to the timing specified in Table 3-3". Table 3-3 line 1 shows max Receive Break and MAB times as 1S. Later...
Forum: RDM Physical Layer/Hardware Discussion June 25th, 2009
Replies: 24
Views: 17,898
Posted By dangeross
Code Size

I may have misled you a little bit my code is a bit large. Each PID has its own function with a lot of redundant code that could be removed by combining the common parts of the PIDs. I do think...
Forum: RDM Physical Layer/Hardware Discussion June 25th, 2009
Replies: 24
Views: 17,898
Posted By dangeross
Thumbs up Code size

We've just completed as design with DMX, RDM, Closed loop PID control and a rather large ASCII interface for bench testing and calibration during manufacture. The RDM also has an additional 10...
Forum: RDM General Implementation Discussion June 25th, 2009
Replies: 9
Views: 10,052
Posted By dangeross
microFTP

I agree the a firmware download addition to RDM would be very difficult to implement in a way that would useful to all user's with the different hardware requirements of all the different...
Forum: RDM Interpretation Questions June 25th, 2009
Replies: 6
Views: 6,128
Posted By dangeross
LAMP FORCED OFF

We've implemented a similar function but not for lamp control. One thing we did was make the command non-persistent so that a reset or power cycle would return our device to normal operation.
Forum: RDM Timing Discussion May 22nd, 2009
Replies: 6
Views: 12,866
Posted By dangeross
With the exception of the break and MAB timing...

With the exception of the break and MAB timing the FTDI and SiLabs chips have large enough FIFO's that for most RDM packets the inter-slot time would be zero as long as your USB driver can push the...
Forum: RDM Interpretation Questions April 16th, 2009
Replies: 2
Views: 5,101
Posted By dangeross
Question Command Class / Parameter ID mismatch handling

What is the consensus on how a responder should handle and respond to a Command Class CC data and Parameter ID PID data mismatch. As an example if the CC data is DISCOVERY_COMMAND and the PID data is...
Forum: RDM Physical Layer/Hardware Discussion April 9th, 2009
Replies: 7
Views: 8,356
Posted By dangeross
Another option might be to use a chip like the...

Another option might be to use a chip like the Intersil ISL3296E with series resistors to limit the drive current to provide the line bias. You could even only enable the bias while the Controller is...
Forum: RDM General Implementation Discussion April 9th, 2009
Replies: 4
Views: 4,881
Posted By dangeross
Multiple Discovery Responses

If the first responder can start its response right at the 176uS Min time from Table 3-4 and transmit the response with a 0S inter-slot time this will take 1.1mS. If the second responder can start...
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