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Forum: RDM Physical Layer/Hardware Discussion September 14th, 2010
Replies: 2
Views: 7,162
Posted By Gerry
Did you miss this: Sympol is NOT interoperable...

Did you miss this:
Sympol is NOT interoperable with RS-422 or RS-485; that is, designers may not mix Sympol nodes with existing RS-485 nodes.

I'ts not RS485. It works by active and passive bus...
Forum: RDM Timing Discussion April 28th, 2010
Replies: 13
Views: 11,999
Posted By Gerry
Hi Shaun, The 75nS is for non-cumlative bit...

Hi Shaun,

The 75nS is for non-cumlative bit distortion of the data. Alowing a shortning of 75ns for each inline device could result in a total 300nS shortning. That's a 7.5% error in bit timing....
Forum: RDM Timing Discussion April 28th, 2010
Replies: 13
Views: 11,999
Posted By Gerry
Shaun, On my own inline device (in...

Shaun,

On my own inline device (in development), turning the bus around is just raising a single port pin high on the processor and takes no time worth worrying about. Once you've received the...
Forum: RDM Interpretation Questions April 1st, 2010
Replies: 28
Views: 13,504
Posted By Gerry
Scott, I don't see ther new PID as an issue. It's...

Scott, I don't see ther new PID as an issue. It's a fixed response, like E120_SUPPORTED_PARAMETERS PID and implemented instead of a "get count" PID. Its just that "get count" feels like wallpapering...
Forum: RDM Interpretation Questions March 31st, 2010
Replies: 28
Views: 13,504
Posted By Gerry
Well I vote for non-contiquous. The way I see it,...

Well I vote for non-contiquous. The way I see it, manufacturers will drop test codes for exactly the reason Eric cited above.

A better way might be to implement a "get test codes" PID in the same...
Forum: RDM Interpretation Questions March 29th, 2010
Replies: 28
Views: 13,504
Posted By Gerry
Hamish, Does this responder actually expect the...

Hamish,
Does this responder actually expect the controller to initiate the self tests?

If the test PD's are documented in the manual, I guess you could build them into your controller, but it...
Forum: RDM General Implementation Discussion January 18th, 2010
Replies: 19
Views: 10,640
Posted By Gerry
Hi Scott & Eric, Thanks for the advice...

Hi Scott & Eric,

Thanks for the advice guys.
I shall abandon the timeout in favour of a strobe on one channel.
Forum: RDM General Implementation Discussion January 15th, 2010
Replies: 19
Views: 10,640
Posted By Gerry
Timing out IDENTIFY_DEVICE

Is it advisable for a responder to time out IDENTIFY_DEVICE?
It seems a good idea to me, as it prevents the situation where a lamp could appear to be stuck on if the controller failed to clear it...
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