QB50 System Requirements Document

5.8 OBC Script CommandsThe following table lists the SCRIPT commands to control the SU operation from theOBC.Command CMD_ID ParametersOBC_SU_ON 0xFB @tOBC_SU_OFF 0xFC @tOBC_SU_END 0xFF @tSU_STDBY 0x02 LEN, @tSU_TH 0x03 LEN, VTH @tSU_STIM 0x04 LEN, PULSE_CNT @tSU_LDP 0x05 LEN, ADDR, B0, B1, …B_LEN-2, @tSU_HC 0x06 LEN, t_del, n_step, v_step, sw_ana, @tSU_CALM 0x07 LEN, t_del, n_step, v_step, sw_ana, @tSU_SCI 0x08 LEN, MODE, V_start, t_dwell, t_delay, seq_rpt @tSU_HK 0x09 LEN, t_sample, @tSU_STM 0x0A LEN, t_sample@tSU_HVARM 0x53 LEN, @tSU_HVEN 0xC9 LEN, @tTable 5-1 - Science Unit Commands5.9 OBC Script Command Description5.9.1 OBC and SU Specific CommandsAny SCRIPT command prefixed by “OBC_” is an instruction to the OBC, and is NOTsent to the Science Unit.Any SCRIPT command prefixed by “SU_”, together with LEN, and any additionalparameters form the command to be sent to the SU.The time field - “@t” shall be read by the OBC and interpreted as a time code – see5.9.2.Note: The command names shown are just MNEMONICS to help human users to writescripts in an understandable manner: these are encoded into binary codes for actualuplink to CubeSats. And of course, the parameters encode into 8 or 16-bit numbers asrequired.