How to record second DC channel/MPPT data with SMASolarinterfacer

Hi @stuartpittaway, now that I got the SMASolarInterfacers on emonHub to work and send data to emonCMS (thanks for your help!) I noted that only one of the two DC channels that my inverter (SB4000TL) has gets recorded. How would I get the data for other channel, i.e. DC voltage 2, DC current 2 and DC power 2? Could you give me a clue where I could find the addresses for these registers or has anyone else already done it? It would be very valuable for me to be able to see what each of the MPPT trackers are doing.