LGB 55021 Version 2.0 decoder, for a DC motor up to 1.5 Amp, lighting terminals front, rear, and the A01 output 0.6A each, all combined not more than 1.2 Amp.
Information as supplied is for Firmware Revisions 2.50 and 2.80, all documentation is available via the links below in this Blog Posting, could be used for references to other Firmware versions of LGB 55021 decoders.
Register Programming Mode CV 6 = 55 and CV 5 = 55, is only required for a Decoder Reset, other CV's can be Read or Write to as normal.
CV 1 short address to 127, Long Address available using CV 17 and CV 18, and changing CV 29 Bit 5 ON.
Massoth Service Tool, is unable to activate a Decoder Reset by using CV 55 = 55, this has also been disabled in the replacement Decoder Template.
Designed a new Massoth Service Tool Template, to replace the original with revised and updated definitions with CV values.
There are a few variances in the default values for the CV's in versions 2.50 and 2.80, which can viewed in PDF's listed below.
Original English only version of the LGB 55021 Decoder Manual, for comparison and reference to the documentation listed above.
LGB 55021 Decoder top view with connections marked.
LGB 55021 decoder with the additional A02 output...............
The decoder alterations as detailed below, should only be carried out by those with competent soldering skills, and by those with an understanding of programming and the use of CV’s.
Based on the original idea from Ernst Reutimann.
LGB 55021 board versions 2.4. and 2.5. are not distinguishably from the board layout, other than an etched date code.
The decoder has one additional function (A01), however there is a second output (A02), an undocumented feature.
Helpful to have the use of a programmer to interrogate CV 7 Firmware Revision & CV 8 Manufacturer ID. From (March 2005) the software revision from 2.50/2.80 and above on the 55021 decoder had a parallel data update.
Refer to the images below, to access the A02 output requires making a solder bridge across two of the pins of the IRF7103, soldering a length of wire across this bridge, this then becomes the negative output for A02, attach bulb or LED and make a further connection to decoder positive U+.
Programming:
CV56 holds the voltage value for A02, range from 1 – 32.
CV57 holds the value for the Function Key assignment, 1 - 8 for the A02 output.
Directional:
Value of key assignment +64, on only when driving reverse.
Value of key assignment +128, on only when driving forward.