Hi Toni,
FilterIdMask can be used for filtering messages from more devices. In your case, there is only one device, so you can set FilterIdMask as 0xfff. For message decomposing, use the INTSM blocks (www.rexygen.com/doc/ENGLISH/MANUALS/BRef/INTSM.html). The basic example of using INTSM block can be found in this thread: https://forum.rexygen.com/topic/174/reading-and-writing-4-byte-floating-point-from-modbus?_=1609251284153
For decomposing a byte value into bits can be used block BDOCT(www.rexygen.com/doc/ENGLISH/MANUALS/BRef/BDOCT.html).
Cheers,
Jan