What are concatenated bits? hex help

[jacrewq]

Im trying to figure out some documentation. I have to use a certain value - in this case 0x29D. But 0x29D is somehow split into 0x85 and 0x1D
and it says :
"These are a long integer. The most significant bits are not used, and the rest of the bits are concatenated to get the intended value 29Dh – this indicates the length of the data."

Please tell me how 0x29d becomes 0x85 and 0x1D. Also where can I find out what concatenated bits are and how to concatenate bits.

Thanks a lot,
Alex

[Weedpacket]

A bit of context might help.... I can see that 0x29D is 001010011101 in binary, 0x85 is 10000101, 0x1D is 00011101, and

   00101  0011101
10000101 00011101

But without knowing what you're talking about.....

[jacrewq]

It's becoming more clear. But could you please help me make a converter of 3-digit hex numbers into two 2-digit hex numbers.

So 0x29D is converted into 0x85 and 0x1D