SPRUI30H November 2015 – May 2024 DRA745 , DRA746 , DRA750 , DRA756
In the MIR and FIR operation modes, the transmitter must send a serial infrared interaction pulse (SIP) at least once every 500 ms. The SIP informs slow devices (operating in SIR mode) that the medium is occupied.
Figure 24-47 shows the SIP.