Satellite integrated receiver decoder and conflict detecting method

A satellite Integrated Receiver Decoder (IRD) complying with DiSEqC (Digital Satellite Equipment Control) protocol capable of receiving a program of a specific channel from a single cable interface device through a cable, wherein the single cable interface device is coupled between an antenna and the cable, the satellite IRD comprising:

• an input/output (I/O) interface, wherein the satellite IRD connects the cable through the I/O interface;
• a DiSEqC transmitter coupled to the I/O interface and configured to transmit a first command corresponding to the specific channel to the single cable interface device through the I/O interface and the cable;
• a DiSEqC receiver coupled to the I/O interface and configured to acquire a second command transmitted on the cable through the I/O interface in response to transmitting the first command by the DiSEqC transmitter;
• and
• a detecting circuit coupled to the DiSEqC receiver and configured to compare the second command with the first command to generate a comparison result;
• wherein the DiSEqC receiver is further configured to monitor the I/O interface in response to the comparison result indicating that the first command and the second command are different, so as to determine whether there is a command other than the first command and generated by a device other than the satellite IRD transmitted on the cable after generating the comparison result,
• wherein the DiSEqC transmitter refrains from retransmitting the first command in response to that it is determined that the command other than the first command is transmitted on the cable.