Optimising the CVs for a further update to the Zimo decoder software for the pair of DRS Bachmann Class 57/0 locomotives
This page describes the configuration used to customise the latest version of Paul Chetter's Class 57 Sound Project for Digitrains.
Power step transitions come in three options, to suit small, medium or large layouts (programmable via CV265).
The new software will be available from Digitrains as "Digidrive E Class 57"
Class 57/0 at York station in 2008.
|The planned lighting
(1) Normal directional light engine lighting via button zero.
(2) Directional lights at end one only, via button 20.
(3) Directional lights at end two only, via button 21.
(4) Cab light at end 1 (the only manned cab) via button 8.
(5) Connector at end 2 to enable some (dubious) effects in the front nuclear flask carrier, enabled via button 10.
A Table Summarising the proposed mapping changes:
The areas in pink require change action
Sound changes require a view of the mapping used within the decoder:
line 1: Brake release, 3 tone horn, single tone toot, better single toot, 2 tone Hi-Lo horn.
line 2: Putt-putt blower.
line 3: Metallic clank.
line 4: Air Brake activation, failed engine start, primer pump, spirax valves, door slam, wheel flange squeal, compressor.
line 5: Brake squeal (on rails).
line 6: All the engine sound clips............
Sound Adjustments: (Via POM)
The CV updates:
Driving characteristics of the new software:
Three sets of engine notch transition speeds are provided, to enable all the engine power levels to be exercised on different sized layouts.
In reality, the engine power required in a diesel electric locomotive, depends on the effort required to move the train at the speed in use. A lightly loaded locomotive may well be cruising with the engine at idle speed for long periods, while a locomotive pulling a heavy train may need full power just to get the train moving from a standing start. Add some track gradients to a loaded train and the relationship between locomotive power level and speed is not at all constant. The 3 operating modes can be selected using CV265: Value 101 gives power transitions up to maximum over the lowest speed range (targeting smaller layouts). 102 moves the transitions a little higher in speed, while 103 caters for larger layouts, typically with a continuous loop.
Paul Chetter has influenced Zimo to include the F6 function, enabling the locomotive to be dropped to idle power from any starting point, to more correctly simulate actual driving practice during cruise periods and in particular, before a train is brought to a halt. Additionally, although the upwards power level transition speed steps are fixed within each of the three layout related options, the power level can quickly be dropped to the next level down by a single power step reduction (which on a 128 speed step system has virtually no visible effect on locomotive speed.) So with practice, prototypical engine power levels can be achieved more often than not.
|Running a 57 with the latest Zimo
A brief trip is taken up and down the test track with one of the KUA 16 wheel Royal Navy nuclear flask carriers hooked up to the number two DRS Class 57.
Zimo fitted Class 57 with the latest KUA update in tow. With only a centimetre or so to spare, stopping locations are critical on the small test track.
The two 57s double heading in consist on the test track.
Use this link to watch the DRS Class 57 pair & KUA (set to layout size option 3) on YouTube: Click here.
|Supplier website links:
The photos of the models were taken using a hand held Canon Ixus 220. The photos of the real 57012 loco were taken back in 2008 at York Station.