DiSEqC commands are directly named after their use and are compatible with the previous standardized analog switch criteria. The basic switch criterion is called "polarization".

In order for the analog polarization switching to continue to function, slave components contain an additional comparator which checks the level of remote fed voltage and informs the DiSEqC slave microcontroller of it.

The control for selecting the frequency band is called "band" and is compatible with the 22kHz tone. Since DiSEqC transfer is also based on the 22kHz tone, the bus modem and the slave microcontroller can detect the continuous tone without additional hardware, too. Since the ToneBurst used to switch between the satellites of two orbital positions is based on the 22kHz tone as well, it can be detected directly from the slave, too. The corresponding DiSEqC command is called "position".

DiSEqC 1.0/2.0 makes a further control signal available; the designation is "Option". Within most receivers the "Option" bit is used to extend the "Position" control up to 4 fullband satellite systems (example in 9.2.1).

Page 20 / 29