Max Value for 32bit Timers - E1.20 RDM (Remote Device Management) Protocol Forums

prwatE120 · January 16th, 2007

Are we agreed that the data in the 32bit Hours/Lamp/Lamp Strike counters is unsigned ? ie max value is 0xFFFFFFFF ?

As far as I can see we do not explicitly state this anywhere in the document - apologies if I have missed it.

regards

Peter Willis

Javid Butler · January 16th, 2007

Yes. I can't think of any situation where there would be negative lamp hours, and anything other than an unsigned integer would only lead to confusion.

sblair · January 19th, 2007

Yes, everything should be unsigned values so that the max value should be 0xFFFFFFFF.

It would also be a good idea for these type fields to not roll over if they exceed the 0xFFFFFFFF value and instead just remain at that Max value.

prwatE120 · January 20th, 2007

Just a note that this was discussed at the Jan 19th 2007 Task group meeting in Dallas and that Scott's response reflected the consensus of the group at that time.

Peter Willis

January 16th, 2007	#1
prwatE120 Task Group Member Join Date: Jun 2006 Posts: 181	Max Value for 32bit Timers Are we agreed that the data in the 32bit Hours/Lamp/Lamp Strike counters is unsigned ? ie max value is 0xFFFFFFFF ? As far as I can see we do not explicitly state this anywhere in the document - apologies if I have missed it. regards Peter Willis

January 19th, 2007	#3
sblair Administrator Join Date: Feb 2006 Posts: 425	Yes, everything should be unsigned values so that the max value should be 0xFFFFFFFF. It would also be a good idea for these type fields to not roll over if they exceed the 0xFFFFFFFF value and instead just remain at that Max value. __________________ Scott M. Blair RDM Protocol Forums Admin

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January 16th, 2007	#2
Javid Butler Task Group Member Join Date: Dec 2006 Posts: 14	Yes. I can't think of any situation where there would be negative lamp hours, and anything other than an unsigned integer would only lead to confusion.

January 20th, 2007	#4
prwatE120 Task Group Member Join Date: Jun 2006 Posts: 181	Just a note that this was discussed at the Jan 19th 2007 Task group meeting in Dallas and that Scott's response reflected the consensus of the group at that time. Peter Willis