I'm having issues querying any group of 0x79B. I'm sending the sequence 0x79B 02 21 01 00 00 00 00 00 for Group 1, and getting a proper response 7BB 10 29 61 01 FF FF F6 56 but when I ask for additional lines with 30 01 00 FF FF FF FF FF or even 30 01 00 00 00 00 00 00, I always get back "NO...