I opened a ticket regarding the use of the REM ON jack. Within a couple hours I had a complete and thorough reply from Tim. Not many places will respond so quickly and thoroughly. Thank you Tim! I asked if I was doing any harm by grounding the REM ON jack continuously and simply turning the 12V supply on and off to remotely control the radio. Tim said no problem. Just for fun, I timed my boot up time with the REM ON jack shorted and not shorted. Exact same boot up time - 54 seconds. This saves adding a remote relay to control the REM ON jack.