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Forum: RDM General Implementation Discussion March 12th, 2014
Replies: 28
Views: 93,603
Posted By ericthegeek
RDM only uses SI units for sensors. But,...

RDM only uses SI units for sensors. But, controllers can easily convert the sensor data and display it in whatever unit makes sense for its users.

For example, a controller that's configured for...
Forum: RDM Interpretation Questions February 26th, 2014
Replies: 4
Views: 48,313
Posted By ericthegeek
Scott is correct, you can return...

Scott is correct, you can return NR_UNSUPPORTED_CC if you support GET but not SET.

However, in the specific example you give, it's really not a good idea. If you only have a single identify mode,...
Forum: RDM General Implementation Discussion February 14th, 2014
Replies: 28
Views: 93,603
Posted By ericthegeek
The STATUS_MESSAGES data format described in...

The STATUS_MESSAGES data format described in E1.20-2010 section 10.3.2 is enclosed in the general packet format described in section 6.2. That enclosing packet has the responder's UID included.
...
Forum: RDM Interpretation Questions February 7th, 2014
Replies: 15
Views: 59,440
Posted By ericthegeek
The controller will never send a request for an...

The controller will never send a request for an _CLEARED Status Type.

The controller will send a GET STATUS_MESSAGES Status Type ERROR. The responder can then return status messages with Status...
Forum: RDM General Implementation Discussion February 6th, 2014
Replies: 1
Views: 23,456
Posted By ericthegeek
This is something I'd also like to see. In...

This is something I'd also like to see. In addition to Framing Errors, a "Comms Status Extended" PID could use the SIP Mechanism defined in E1.11 to validate the checksum for NSC packets.
...
Forum: RDM General Implementation Discussion February 6th, 2014
Replies: 1
Views: 27,148
Posted By ericthegeek
During the initial brainstorming session there...

During the initial brainstorming session there was a discussion of "Topology Mapping" PIDs, which is similar to what you are describing. Rather than "Last Active Port", PID the idea was to have a...
Forum: RDM General Implementation Discussion February 5th, 2014
Replies: 28
Views: 93,603
Posted By ericthegeek
Status messages are typically used to report...

Status messages are typically used to report unusual conditions. When a sensor goes outside of the normal range, the responder might return a Status Type "WARNING" for STS_OVERTEMP as we discussed...
Forum: RDM General Implementation Discussion February 5th, 2014
Replies: 28
Views: 93,603
Posted By ericthegeek
You can use a STATUS_MESSAGE to deliver a message...

You can use a STATUS_MESSAGE to deliver a message such as "Sensor 15 over temp at 100 degrees C" (In this example, you'd use STS_OVERTEMP with "Data Value 1" set to 15 and "Data Value 2" set to 100)....
Forum: RDM General Implementation Discussion February 1st, 2014
Replies: 7
Views: 36,996
Posted By ericthegeek
If we did a PID like this, how would we structure...

If we did a PID like this, how would we structure it?

A: Dedicated PIDs for PAN_LOCK and TILT_LOCK?

B: Generic AXIS_LOCK PID where there can be up to 255 named axes, each of which can be locked...
Forum: RDM General Implementation Discussion January 30th, 2014
Replies: 5
Views: 36,639
Posted By ericthegeek
Additional thoughts: Feature number 0xFF means...

Additional thoughts:
Feature number 0xFF means "All features"

SET for "All Features" can disable/enable all at once
GET for "All Features" is not defined and shall return "Unsupported Command...
Forum: RDM General Implementation Discussion January 29th, 2014
Replies: 5
Views: 36,639
Posted By ericthegeek
Diane, can your propose a packet format? ...

Diane, can your propose a packet format?

Sometime like this?

GET FEATURE_DISABLE
-Feature number (8-bit)

GET FEATURE_DISABLE Response
-Feature number (8-bit)
-Total number of features
Forum: RDM Interpretation Questions January 5th, 2014
Replies: 15
Views: 59,440
Posted By ericthegeek
My interpretation is that you should send the...

My interpretation is that you should send the Empty Status response.

Another corner case to watch out for if what happens if you receive a STATUS_GET_LAST_MESSAGE before you've received any GET...
Forum: RDM Interpretation Questions January 4th, 2014
Replies: 15
Views: 59,440
Posted By ericthegeek
Yes, you are correct. Also, make sure you...

Yes, you are correct.

Also, make sure you handle STATUS_GET_LAST_MESSAGE properly. GET_LAST is used to re-transmit Status Messages (and Queued Messages) when the data gets lost or corrupted...
Forum: RDM Interpretation Questions January 3rd, 2014
Replies: 15
Views: 59,440
Posted By ericthegeek
If you're at all serious about RDM Development,...

If you're at all serious about RDM Development, let me reiterate Scott's suggestion to attend the plugfest. The plugfests aren't boring technical presentations. Rather, it's a bunch of engineers...
Forum: RDM General Implementation Discussion December 11th, 2013
Replies: 14
Views: 44,735
Posted By ericthegeek
In pseudo-code you want something like this: ...

In pseudo-code you want something like this:

if( my_uid >= lower_bound ) && ( my_uid <= upper_bound ) && ( request_PDL == 12 )
{
send_DUB_response();
}

Skimming the Microchip C compiler...
Forum: RDM General Implementation Discussion December 10th, 2013
Replies: 14
Views: 44,735
Posted By ericthegeek
Auto-inverting has been tried before, and it...

Auto-inverting has been tried before, and it never works out well. The problem is I can build a waveform that forms perfectly valid DMX both normally and inverted. Also, attempts to do...
Forum: RDM General Implementation Discussion December 10th, 2013
Replies: 14
Views: 44,735
Posted By ericthegeek
You're probably sick of hearing from me at this...

You're probably sick of hearing from me at this point, and I already put in my plug for the DMXter4. My other tools are a DFD RAD, a recent AL Art-Net node, a copy of ETC's Net3 Concert, and a...
Forum: RDM General Implementation Discussion December 9th, 2013
Replies: 14
Views: 44,735
Posted By ericthegeek
I can't speak for Enttec, but in general there's...

I can't speak for Enttec, but in general there's a tradeoff between how much intelligence you put in the peripheral (USB to DMX adapter), and how much you require from the host software. In this...
Forum: RDM General Implementation Discussion December 9th, 2013
Replies: 14
Views: 44,735
Posted By ericthegeek
I skimmed Enttec's documents. Are you using...

I skimmed Enttec's documents.

Are you using this Enttec RDM Library for Windows:
http://www.enttec.com/?main_menu=Products&pn=70533

Or are you using their USB Protocol directly?...
Forum: RDM General Implementation Discussion December 9th, 2013
Replies: 14
Views: 44,735
Posted By ericthegeek
Are you saying that you're putting a Broadcast...

Are you saying that you're putting a Broadcast UID in the "Destination UID" field for the GET_COMMAND_RESPONSE packet? This may be a quirk of the Enttec software API, but it's unlikely to work with...
Forum: RDM Physical Layer/Hardware Discussion October 31st, 2013
Replies: 2
Views: 42,398
Posted By ericthegeek
YES! There are lots of splitters out there...

YES!

There are lots of splitters out there that don't act as a proxy. I've personally build two of them, one fully manageable and protocol aware, the other extremely simple with only minimal...
Forum: RDM General Implementation Discussion October 31st, 2013
Replies: 4
Views: 46,052
Posted By ericthegeek
There's nothing in the standard that requires...

There's nothing in the standard that requires controllers to support queued messages. Thus, a manufacturer is free to decide whether they wish to support them or not.

But, a controller that...
Forum: RDM Interpretation Questions September 27th, 2013
Replies: 1
Views: 51,241
Posted By ericthegeek
STATUS_GET_LAST_MESSAGE should always return the...

STATUS_GET_LAST_MESSAGE should always return the last message that was sent.

STATUS_GET_LAST_MESSAGE is used to handle the situation where a Status or Queued message is lost or corrupt. If the...
Forum: RDM General Implementation Discussion August 1st, 2013
Replies: 13
Views: 41,946
Posted By ericthegeek
I have seen a number of responders that support...

I have seen a number of responders that support GET for DEVICE_LABEL on Sub-Devices, but that don't allow you to SET it.

For example, the Root has a Label that can be both GET and SET, but each...
Forum: RDM Interpretation Questions July 29th, 2013
Replies: 3
Views: 44,568
Posted By ericthegeek
"ERROR: DMX_BLOCK_ADDRESS included in...

"ERROR: DMX_BLOCK_ADDRESS included in SUPPORTED_PARAMETERS but responder has no sub-devices"

To me it's similar to the "Sub-Device Status Reporting Threshold" PID that only makes sense when the...
Forum: RDM General Implementation Discussion July 18th, 2013
Replies: 2
Views: 35,786
Posted By ericthegeek
My interpretation has been that...

My interpretation has been that SUB_DEVICE_ALL_CALL should only effect Sub-Devices and not change the root at all.

In the case where someone sends a broadcast request to SUB_DEVICE_ALL_CALL, only...
Forum: RDM Interpretation Questions June 25th, 2013
Replies: 7
Views: 56,326
Posted By ericthegeek
I fear I'm being a bit dense and not fully...

I fear I'm being a bit dense and not fully understanding the problem.

You have a RDM responder that has both a Root device with a non-zero slot footprint, and also has Sub-Devices with a non-zero...
Forum: RDM Interpretation Questions June 25th, 2013
Replies: 7
Views: 56,326
Posted By ericthegeek
I've never really liked the block address PID. I...

I've never really liked the block address PID. I feel that any kind of block addressing should be handled as a for() loop in the controller rather than in the responder.

The DEVICE_INFO PID is...
Forum: RDM Interpretation Questions June 13th, 2013
Replies: 14
Views: 62,246
Posted By ericthegeek
> Right, but generating a less than 2ms response...

> Right, but generating a less than 2ms response will
> not slow down the discovery process, when compared
> to a timeout.

When I talk about speeding up discovery, it's not a really matter of...
Forum: RDM Interpretation Questions June 13th, 2013
Replies: 14
Views: 62,246
Posted By ericthegeek
Hamish is right. Because of the way the language...

Hamish is right. Because of the way the language in the standard is written, you can't "NACK" a request with a Discovery Command Class. NACK can only be used with GET and SET requests.

Also,...
Forum: RDM Interpretation Questions May 6th, 2013
Replies: 14
Views: 62,246
Posted By ericthegeek
I see what you're talking about now: There's a...

I see what you're talking about now: There's a responder that will accept any length Label in a SET command, but when the controller does a GET for the Label, the responder always returns 32...
Forum: RDM Interpretation Questions May 3rd, 2013
Replies: 14
Views: 62,246
Posted By ericthegeek
Are you referring to the OLA RDM Responder Tests?...

Are you referring to the OLA RDM Responder Tests? Can you post the exact error message you're getting, including the relevant log files?

Filling a label with all spaces is permissible.
Forum: RDM Interpretation Questions April 23rd, 2013
Replies: 9
Views: 53,306
Posted By ericthegeek
Definitely something to be aware of. This is the...

Definitely something to be aware of. This is the kind of knowledge that falls in the realm of "Best Practices". Hopefully most RDM developers will find and read this forum at some point in their...
Forum: RDM Interpretation Questions April 23rd, 2013
Replies: 9
Views: 53,306
Posted By ericthegeek
Unfortunately, RDM will probably never provide...

Unfortunately, RDM will probably never provide enough information to eliminate the need for console personality libraries, especially for something as complex as a media server. Conceptually, it's...
Forum: RDM Interpretation Questions April 22nd, 2013
Replies: 9
Views: 53,306
Posted By ericthegeek
For Scenario #1: If you're implementing an RDM...

For Scenario #1:
If you're implementing an RDM responder with different kinds of sub-device modules that can be installed, I'd probably take an "all of the above" strategy. I would give each...
Forum: RDM General Implementation Discussion March 21st, 2013
Replies: 4
Views: 27,391
Posted By ericthegeek
Here are two packet histories from a DMXter4. ...

Here are two packet histories from a DMXter4.

"DMXter4 Discovery.txt" shows the DMXter running full discovery for a single device. There's one request/response pair per line. Following along...
Forum: RDM General Implementation Discussion March 21st, 2013
Replies: 4
Views: 27,391
Posted By ericthegeek
How are you determining what PIDs the DMXter is...

How are you determining what PIDs the DMXter is sending? The DMXter should only send a RESET_DEVICE when explicitly told to do so from the "Setup Device" menu, and never from the Discovery menu.
...
Forum: RDM Marketplace Discussion February 6th, 2013
Replies: 4
Views: 49,473
Posted By ericthegeek
That is correct. DMX used to call them...

That is correct. DMX used to call them "Channels", but that term meant many different things depending on context. Starting with the E1.11-2004 revision of DMX, the term was changed to "Slot" to...
Forum: RDM General Implementation Discussion August 7th, 2012
Replies: 8
Views: 37,248
Posted By ericthegeek
That's not necessarily a valid assumption. I...

That's not necessarily a valid assumption. I don't recall how the Enttec software handles discovery, but there are controllers out there that will add a responder to the table of discovered devices...
Forum: RDM Physical Layer/Hardware Discussion July 12th, 2012
Replies: 14
Views: 92,241
Posted By ericthegeek
The standard says (emphasis added): "Command...

The standard says (emphasis added):
"Command ports shall include the line biasing network."

"Command ports may be designed with means to disconnect the line biasing network."

A command port...
Forum: RDM Physical Layer/Hardware Discussion July 10th, 2012
Replies: 14
Views: 92,241
Posted By ericthegeek
Realistically, you'll need a few different...

Realistically, you'll need a few different controllers. Different pieces of test equipment excel in different areas.

The cheapest RDM controller I know of is DFD's RAD. But it's not exactly full...
Forum: RDM Physical Layer/Hardware Discussion July 9th, 2012
Replies: 14
Views: 92,241
Posted By ericthegeek
Once you have your device working, I'd encourage...

Once you have your device working, I'd encourage you to do a lot of testing with as many different devices as you can (controllers and responders).

Building a hub turns out to be one of the more...
Forum: RDM Physical Layer/Hardware Discussion July 7th, 2012
Replies: 14
Views: 92,241
Posted By ericthegeek
Yes, you are correct. The formal RDM...

Yes, you are correct.

The formal RDM terminology is "Command Port" and "Responder Port". A 1-in, 2-out RDM splitter would have 2 Command Ports and 1 Responder Port. The two command ports would...
Forum: RDM Physical Layer/Hardware Discussion July 7th, 2012
Replies: 14
Views: 92,241
Posted By ericthegeek
What you're describing is usually called an RDM...

What you're describing is usually called an RDM Hub or RDM Splitter.

It's generally a bad idea to have a single DMX input with fixed termination unless you're absolutely certain your device will...
Forum: RDM General Implementation Discussion June 29th, 2012
Replies: 3
Views: 25,834
Posted By ericthegeek
Yes, each sub-device can have a different...

Yes, each sub-device can have a different footprint and that footprint can change based on the currently selected personality.



The footprint field in DEVICE_INFO should always reflect the...
Forum: RDM Interpretation Questions June 15th, 2012
Replies: 6
Views: 46,406
Posted By ericthegeek
Yes, that is my opinion. Consider the...

Yes, that is my opinion.

Consider the following sequence:
Using the menu interface on the Fixture itself, a user changes the DMX address of a fixture to 300.

The fixture adds a "GET_RESPONSE ...
Forum: RDM Interpretation Questions June 14th, 2012
Replies: 6
Views: 46,406
Posted By ericthegeek
To me, a NR_BUFFER_FULL response means that the...

To me, a NR_BUFFER_FULL response means that the responder could not handle the request and therefore dropped it without acting on it. This is most similar to what you described as behavior #2.
...
Forum: RDM General Implementation Discussion June 8th, 2012
Replies: 11
Views: 61,954
Posted By ericthegeek
Hey, great, thank you for doing this work!

Hey, great, thank you for doing this work!
Forum: RDM General Implementation Discussion May 30th, 2012
Replies: 4
Views: 33,990
Posted By ericthegeek
There are lots of ways to assign UIDs to your RDM...

There are lots of ways to assign UIDs to your RDM devices.

Most EPROM and Device programmers offer a serialization feature that can put a unique serial number into non-volatile memory at the same...
Forum: RDM General Implementation Discussion May 29th, 2012
Replies: 4
Views: 33,990
Posted By ericthegeek
Doing this would violate section 5.1 of the RDM...

Doing this would violate section 5.1 of the RDM standard which requires that "The 32-bit device ID shall be unique throughout all products manufactured under a specific Manufacturer ID..."

It's...
Forum: RDM Interpretation Questions May 24th, 2012
Replies: 13
Views: 83,690
Posted By ericthegeek
Correct, that matches my interpretation.

Correct, that matches my interpretation.
Forum: RDM Interpretation Questions May 24th, 2012
Replies: 13
Views: 83,690
Posted By ericthegeek
Status Type only applies to Status Messages. ...

Status Type only applies to Status Messages. Normal PIDs don't really have a Status Type associated with them.

The GET QUEUED_MESSAGE PID is unusual in that the responder can respond with a...
Forum: RDM General Implementation Discussion May 15th, 2012
Replies: 11
Views: 61,954
Posted By ericthegeek
Here is a wireshark capture of the traffic...

Here is a wireshark capture of the traffic between AL's DMX Workshop and an Art-Net node. The Node has a single Lab-Pack RDM responder connected to the first port.

I hope this helps.

Thanks...
Forum: RDM Interpretation Questions May 1st, 2012
Replies: 12
Views: 47,515
Posted By ericthegeek
Scott, you and I are talking about something...

Scott, you and I are talking about something different.

On the root device, the standard says that the list of PIDs returned by GET SUPPORTED_PARAMETERS does not include the mandatory PIDs. For...
Forum: RDM Interpretation Questions May 1st, 2012
Replies: 12
Views: 47,515
Posted By ericthegeek
On other factor that's come up in newer...

On other factor that's come up in newer discussions is that Sub-Devices should list all of their PIDs in SUPPORTED_PARAMETERS, even PIDs like DEVICE_INFO that are mandatory and not listed in...
Forum: RDM Interpretation Questions May 1st, 2012
Replies: 5
Views: 44,031
Posted By ericthegeek
YES!!! Mark the packet as broken. If the...

YES!!! Mark the packet as broken. If the received PDL doesn't match the expected value for that PID, then the packet is corrupt and should be flagged as such.

This is a common problem, I've seen...
Forum: RDM Interpretation Questions April 30th, 2012
Replies: 12
Views: 47,515
Posted By ericthegeek
I've posted my thoughts on Sub-Devices before in...

I've posted my thoughts on Sub-Devices before in this thread:
http://rdmprotocol.org/forums/showpost.php?p=1724&postcount=6

Here's what I wrote:
Forum: RDM General Implementation Discussion March 3rd, 2012
Replies: 19
Views: 95,846
Posted By ericthegeek
This problem is not unique to RDM can happen with...

This problem is not unique to RDM can happen with plain old DMX too. If you've put the fixture into a strobe or color cycle mode and then lose DMX control, many fixtures will hold their last state...
Forum: RDM General Implementation Discussion March 3rd, 2012
Replies: 7
Views: 38,167
Posted By ericthegeek
This did get me thinking about the behavior of...

This did get me thinking about the behavior of PARAMETER_DESCRIPTION. Because of the section 6.2.10.2 language, I'd previously said that to save time, you could send a GET PARAMETER_DESCRIPTION to...
Forum: RDM General Implementation Discussion March 2nd, 2012
Replies: 7
Views: 38,167
Posted By ericthegeek
Although the standard doesn't explicitly require...

Although the standard doesn't explicitly require it, many RDM implementations will assume that the response to GET PARAMETER_DESCRIPTION for a given PID will be constant throughout the life of a...
Forum: RDM General Implementation Discussion February 23rd, 2012
Replies: 6
Views: 37,118
Posted By ericthegeek
A framing error isn't enough to reliably detect a...

A framing error isn't enough to reliably detect a break, especially in the presence of noise on the DMX line or during discovery.

Your best bet is to use a timer/counter to measure the amount of...
Forum: RDM General Implementation Discussion February 22nd, 2012
Replies: 2
Views: 30,076
Posted By ericthegeek
For RDM to be much help, you'd need a smoke...

For RDM to be much help, you'd need a smoke machine that supports RDM. Then it could use one of several mechanisms provided by the RDM protocol to let the controller know when it was ready.

If...
Forum: RDM Interpretation Questions February 16th, 2012
Replies: 6
Views: 29,006
Posted By ericthegeek
From a practical standpoint, it is possible to...

From a practical standpoint, it is possible to implement a responder that does not use queued messages at all. You'd have to design your firmware to ensure that all results are available within the...
Forum: RDM Interpretation Questions February 15th, 2012
Replies: 6
Views: 29,006
Posted By ericthegeek
Simon is correct. A controller will regularly...

Simon is correct. A controller will regularly see Case #2 when one or more proxies are involved.

You can even see:

request: GET QUEUED_MESSAGE
response: GET_RESPONSE ACK_TIMER LAMP_HOURS...
Forum: RDM General Implementation Discussion January 24th, 2012
Replies: 5
Views: 31,480
Posted By ericthegeek
Don't rely on any third party documents. Tables...

Don't rely on any third party documents. Tables 3-1 through 3-4 in the E1.20-2010 standard are the official timing requirements. RDM Timing is very strict, plan on spending lots of time with an...
Forum: RDM General Implementation Discussion January 6th, 2012
Replies: 11
Views: 37,246
Posted By ericthegeek
I'm sorry, I may have misunderstood you. When you...

I'm sorry, I may have misunderstood you. When you said "I have gone with each sub device acting as a separate device", I thought you meant that each layer was being assigned a different UID, and...
Forum: RDM General Implementation Discussion January 6th, 2012
Replies: 11
Views: 37,246
Posted By ericthegeek
If you're going to go this route, it might be a...

If you're going to go this route, it might be a good idea to have the the master device act as a managed proxy, and represent the Audio and Video Layers act as proxied devices.
Forum: RDM General Implementation Discussion January 4th, 2012
Replies: 11
Views: 37,246
Posted By ericthegeek
The standard leaves a some room for...

The standard leaves a some room for interpretation as to how different one sub-device can be from another. Sub-devices aren't completely separate, but they are mostly separate.

All that's...
Forum: RDM General Implementation Discussion December 16th, 2011
Replies: 3
Views: 29,998
Posted By ericthegeek
This situation is is analogous to a dimmer rack...

This situation is is analogous to a dimmer rack with a variable number of field-installable dimmer modules. It's a perfect application for sub-devices. A 96-way dimmer rack can have between zero...
Forum: RDM General Implementation Discussion October 14th, 2011
Replies: 2
Views: 25,307
Posted By ericthegeek
For a GPS position, you could use two sensors...

For a GPS position, you could use two sensors with SENS_ANGLE and UNITS_DEGREE.

Unfortunately, the 16-bit resolution of RDM sensors won't work very well for GPS because of the large scale. ...
Forum: RDM General Implementation Discussion September 16th, 2011
Replies: 4
Views: 28,072
Posted By ericthegeek
Zero88 has created this logo, and I believe it's...

Zero88 has created this logo, and I believe it's freely available for anyone to use. You'll have to check with them to be sure.

http://common.zero88.com/public/files/DMX-RDM.zip
Forum: RDM General Implementation Discussion September 1st, 2011
Replies: 7
Views: 36,484
Posted By ericthegeek
The matter of how strict a device should be is a...

The matter of how strict a device should be is a philosophical one. It's a matter of strict compliance vs. "I can figure out what they meant to do so I will accept it". I've seen lots of devices...
Forum: RDM General Implementation Discussion September 1st, 2011
Replies: 2
Views: 44,788
Posted By ericthegeek
A responder has no way to know if the controller...

A responder has no way to know if the controller supports the _CLEARED messages. All you can do is send the _CLEARED response and hope the controller handles it gracefully. There's really no other...
Forum: RDM Timing Discussion August 23rd, 2011
Replies: 9
Views: 56,932
Posted By ericthegeek
NR_BUFFER_FULL is for when the target responder...

NR_BUFFER_FULL is for when the target responder has no buffer space available.

NR_PROXY_BUFFER_FULL is for when the proxy, or some other in-line device between the controller and the target...
Forum: RDM Timing Discussion August 21st, 2011
Replies: 9
Views: 56,932
Posted By ericthegeek
The NACK Reason Code for Proxy Buffer Full was...

The NACK Reason Code for Proxy Buffer Full was added in the 2010 version of RDM.

The list of changes between E1.20-2006 and and E1.20-2010 is available here...
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