# README 2024/09/19
#

= MEA2 L0 binary data format

There are L0 binary files for Venus flyby #1 and Mercurt flyby #4.

In both cases, we got a problem before the closest approch :
MEA2 switched to a mode with only DataID = 7 telemetry product, but we didn't find an commanding TCs that can explain this mode change.

== Files pattern :

* MEA2_L0_yyyymmdd_TLM_240.dat

MEA2 binary L0 data for yyyy/mm/dd
 
* MEA2_L0_yyyymmdd_TLM_240.log

MEA2 telemetry download logfile


== Files content:

MEA2 binary L0 files containts both APID 0530 (science) and 0630 (HKs)

== Data format 

int32_t	len
byte_t 	data [0..len-1]

data correspond to the struct tlm_pkt {} define in MMO_SDTP.h include file.

struct tlm_pkt {
    unsigned char ad_ver[1];
    unsigned char ad_sat[1];
    unsigned char ad_tim[10];
    unsigned char ad_bnd[1];
    unsigned char ad_dm1[1];
    unsigned char ad_dm2[1];
    unsigned char ad_lck[1];
    unsigned char ad_brt[1];
    unsigned char ad_pno[5];
    unsigned char ad_dm3[1];
    unsigned char ad_ant[1];
    unsigned char ad_rsv[8];
    unsigned char ad_rs2[32];

    unsigned char ccsds_h1[6];		/* packet header */
    unsigned char ccsds_h2[8];		/* 2nd header */
    unsigned char u_data[65532];	/* TB checked*/
}

data = [SDTP_HEADER][CCSDS_HEADER1][CCSDS_HEADER2][USER_DATA]