Half time warm up rule: 17 & 3 USC on Coach

[kfo9494]

What we do now is -- About five minutes before the end of the halftime (twenty minutes) we send the LJ and BJ to the locker rooms and advised that they have ( ) certain amount of time before the end of half-time. It has been the coaches responsibility to have the players out there at the end of the halftime clock.
We have been setting 3:00 right at the end of half-time and let it run down. If the players were not out there it was the coaches fault. We just let the clock run down and then started playing. If the team delayed the start of the 3rd quarter then we must have a penalty.
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I have not read the new rule but heard someone talk about it.
Now are we going to have a penalty if they are not out there at the end of half-time?