SoundTraxx SoundCar Technical Reference - Manual (Page 14)

Tsunami SoundCar Technical Reference Page 12
CVs 17, 18
Extended Address
Description
CVs 17 and 18 comprise a “paired” CV, meaning that the two CV registers
hold one piece of data. In this case, the CV pair holds the 14-bit extended
decoder address.
CV 17 Extended Address MSB
CV 18 Extended Address LSB
A0-A15: Extended Address Value
Additional Information
The extended address allows the decoder to be assigned to one of 10,179
addresses ranging from 0xC000 to 0xE7FF. Note: Most command stations
will only recognize addresses 0001 to 9999. The extended address will only
be recognized by the decoder when bit 5 (Extended Address Mode Enable)
of CV 29 (Configuration Register 1) is set to 1. Once this bit is set, the
decoder will not 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
extended address to the number 49152. Divide the sum by 256. Program
CV 17 with the quotient value and CV 18 with the remainder value.
Example: Calculate CV 17 and 18 register values for extended address 7152.
1. 7152 + 49152 = 56304
2. 56304 ÷ 256 = 219 Quotient; 240 Remainder
3. Program 219 into CV 17
4. Program 240 into CV 18
Note: Most command stations will perform these calculations automatically
when setting the extended address. However, it’s helpful to know how to
derive the appropriate register values.
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