Since no one sent me details, I did some more experimenting and found a couple of work-arounds:
1) As expected, HRD connects and turns the TS-480 on if both RRC's are in Program Mode 4. Since this is a
mixed head / non-head environment, then this is not a solution. This would be the same as when the TS-480
is running locally in the shack.
2) If I switch the radio-RRC to mode 5, then HRD using the control-RRC (still in mode 4) receives a "can't connect".
However, if you then wait a couple of seconds and try again, then it does connect and turns the TS-480 on.
The control-RRC maintains the SIP connection, so the other user with a head can not connect. Therefore, the
user without the head must turn off or restart his control-RRC to allow the other user(s) with a head to access.
3) The other work-around would be for the head user(s) to manually switch the radio-RRC (using web config over
the internet) to mode 5 and then back again. The non-head users can leave their RRC's in mode 4. Of course,
this can be done the other way around.
Unless you have a better way, then I will assume that these are the two work-arounds to suggest.
73,
Mitch DJ0QN / K7Dx