SPRUIU1C July 2020 – February 2024 DRA821U , DRA821U-Q1
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 12-394 shows the SIP.