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RDM Interpretation Questions Discussion and questions relating to interpreting and understanding the E1.20 RDM Standard.

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Old July 12th, 2006   #1
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Join Date: Jul 2006
Posts: 6
Default Request in the middle of ACK_TIMER

Hey all,

Since the spec doesn't cover this in detail, I just wanted to know how what should be the outcome of this possible scenario :-

Controller sends SET_CMD (LAMP_STRIKE)
Responder sends back an ACK_TIMER ( wait 5 secs)
. .
. Controller sends a GET_CMD (any PID)
. Responder sends back an ACK_TIMR (wait 2 secs)
. .
. .
(end of 5 sec) Controller sends GET_QUEUED
what happens now ?
(In the Message Queue on Responder , we'll have 2 messages, which gets sent first ?)
I'd assume a FIFO (is that correct ?)

Hope it makes Sense


Last edited by endoftheworld; July 12th, 2006 at 01:04 AM.
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Old July 13th, 2006   #2
Join Date: Feb 2006
Posts: 433
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It's up to the device. There are no requirements as to which message gets sent first. There could also be other messages pending as well, for example someone could have changed the DMX Start Address on the menu of the device so it Queued up a message to report that back to the console as well.

Put another way, the controller should never make an assumption that just because it got an ACK_TIMER earlier that when it does the next GET QUEUED_MESSAGE that it would get a response back for a specific PID.

Hope that helps..
Scott M. Blair
RDM Protocol Forums Admin
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