Detalles de las siguientes tramas SPB-490: MEC:01 (PI), MEC:0A (RT), MEC:0D (Real Time Clock), MEC:16 (Group Sequence), MEC:3A (Encoder access right), MEC:42 (ODA Free-format group – Message bits), MEC:44 (ODA “Burst Mode” Control), MEC:45 (ODA “Spinning Wheel” timing Control) y MEC:2D (Transmission operator specific command).