How do I map ELV notation quad decimal to hex numbers?

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ELV manuals always use the "quad decimal numbers" for addressing of components. In FHEM hexadecimal codes are also used. Here is the mapping:

1x quad	2x quad	3x quad	4x quad
11 = 0x0 12 = 0x1 13 = 0x2 14 = 0x3	21 = 0x4 22 = 0x5 23 = 0x6 24 = 0x7	31 = 0x8 32 = 0x9 33 = 0xA 34 = 0xB	41 = 0xC 42 = 0xD 43 = 0xE 44 = 0xF

Example

"Hauscode" decimal "43211234" maps to "e41b" hexadecimal.

See also fhem reference:FS20