Справочник Пользователя для Novatel DL-V3

The extcontrol command provides a means of disabling the automatic POWERUP group execution.

When entered prior to POWERUP group execution (prior to acquisition of coarse time), the extcontrol 
command prevents subsequent automatic execution of the POWERUP group. The extcontrol 
command is ignored if entered after POWERUP execution has already started.

extcontrol