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A-Track Reference Manual
Lo button showing the lower half of the page, and the Hi button the upper half.
Confirmation of which Block is currently on display is indicated by a number in the
top left corner of the grid, 000 for the low block of the first CV page (see all
preceding pictures), and 128 for the high block, as shown below –
Where the selected Decoder Manufacturer, such as Digitrax or SoundTraxx, does
not use any CV greater than CV256, only the Base Page will be enabled in the
Access CV Page section, as shown above. However, for decoders which use larger
numbers of CVs, the next Extended Page (CV257 to CV512) may also be enabled.
A-Track will again display the contents of the Extended Page in two Blocks, the low
block (CV257-CV384) indicated by having 256 in the top left corner, and the high
block (CV385-CV512) with 384.
Two CV Pages, however, are not sufficient to accommodate the most recent
generation of sound decoders from ESU (LokSound), for example, which employ
over 600 distinct CVs. In this case, the CVs are accessed using an Indexed
Addressing scheme defined by the NMRA. Rather than continue the upward
numering of CVs, each additional page of 256 CVs retains the addresses of the
Extended page (CV257-CV512) but is identified uniquely by an additional Index
value of 1, 2, 3, etc. An Index value of 0 identifies the “real” Extended Page.
The Page Index is set by loading appropriate values to CV31 and CV32, but this is
taken care of automatically by A-Track, so that you do not need to be concerned
about such details when setting up and programming your locomotive sound
decoders.
Selection of ESU LokSound as the Decoder Manufacturer will enable access to three
Indexed Pages in addition to the Base and Extended CV Pages. Half of each Page
(one Block) can be viewed at any one time in the CV Value grid by selection of the
required Page in the Access CV Page section together with either the low or high
Block in the View CV Block area. Each of the Indexed Blocks are identified with one
of the captions X1L, X1H, . . . , X3L, X3H appearing in the top left corner of the CV
Value grid, as shown in the example below –
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Version 4.3.2