Connection is made with the ESI Enhanced Speech Interface or CI Computer Interface . Metering values and status conditions returned by the transmitter control system are constantly watched by the program to determine if corrective action is necessary. Modes can contain tests, commands and branching instructions to complete the desired corrective action. Power trim is an example of a simple mode. The mode waits for power to exceed pre-set limits, then makes and logs the adjustment.
Different limits can be active at different times of the day, permitting day and night power levels.
More complex modes may be constructed using conditional branching to control execution. A transmitter change-over mode, for instance, might test line voltage and filaments before switching. Function keys on the computer may also be used to turn on modes, permitting one-button execution of complex sequences. As each selection is made, a new window pops up, offering the next logical set of choices. With the status of all modes displayed on the screen, the operator can see exactly what step each mode is executing and what time the next step will occur.