SoundTraxx Tsunami Steam Technical Reference - Manual (Page 16)

Tsunami Technical Reference Page 14
CV 17,18
Extended Address
Description
CV 17 and 18 make up a ‘paired’ CV, meaning that the two CV registers
taken together hold one piece of data; in this case, the 14-bit extended
decoder address:
CV 17 Extended Address MSB
CV 18 Extended Address LSB
A0-A15: Extended Address Value
The extended address allows the decoder to be assigned one of 10,179
addresses ranging from 0xC000 to 0xE7FF (Note however, that most
command stations will only recognize addresses 0000 through 9999.). The
extended address will only be recognized by the decoder when CV 29, bit
5 is set to 1. Once this bit is set, the decoder will no longer recognize its
primary address until CV 29, bit 5 is cleared.
CV 17 contains the most significant byte and must be loaded with values
within the range of 0xC0 and 0xE7. CV 18 contains the least significant byte
and may contain any value.
To determine the extended address value, add the desired four-digit address
to the number 49152. Divide this number by 256 and record the quotient and
the remainder. CV 17 is then programmed with the quotient value and CV 18
is programmed with the remainder value.
Example: Compute CV 17 and 18 register values for extended address 7152.
1. Add 7152 to 49152: Sum = 56304.
2. Divide 56304 by 256: Quotient = 219 Remainder = 240
3. Program CV 17 to 219
4. Program CV 18 to 240
Note: Most command stations will handle these computations automatically
Primary CVs
Bit 7 Bit 0
A15 A14 A13 A12 A11 A10 A9 A8
Bit 7 Bit 0
A7 A6 A5 A4 A3 A2 A1 A0