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LGB 55029 CV 31 & CV 32 Selection for multiple occupation for CV's 257 - 512:

Further info can also be found here in this Blog Post, LGB 55029 Decoder Introduction

Information collated for own use, made available for use for individuals who may have a passing academic interest in the workings of CV 31 & CV 32. 

For the most part, as the majority of decoders will have been Factory fitted, the info will only be of real use for the curiosity value. 

For retrofit decoders, as the mDT3 program will have been used to 'clone' the original mdtp file, some minor tweaking and fine tuning, tinkering with the Topics via CV 31 & CV 32 may well be required.

For retrofit decoders, with new or modified Sound Files, having access to what CV 31 & CV 32  do, will be necessary.

Whilst having use of the  mDT3 program and the associated programming hardware, for the initial setting up and configuring, it's a bit of faff to keep having to remove the decoder from the loco and using the programming interface to adjust, amend, fine tune CV's.

Hence the reasoning behind the decoder templates designed from the Massoth Service Tool program, wholesale changes can be made on the fly with a minimum of  mouse clicks.

An upside from the templates, is that the information is collected in real time from the decoder, and can be used to produce Info Cards.

These then can be used as aides to memoir for when using the Navigator Handset for adjusting CV's.

The collated information from the original manual(s), and the additional information garnered from the Massoth Service Tool program, can then be compiled into a Loco Information Book for future reference.

CV 31 & CV 32.

The range of CV 257 to CV 512 are assigned several times within the decoder Firmware.

Accordingly, before altering these CV's, it must be specified which range of CV’s to change.

This is entered in CV 31 and CV 32.

First set CV 31 which is the Topic, and then CV 32 for the page to be edited.

The following are the seven Topic’s that can be accessed, details to be found in separate Blog Postings below.

Current thresholds - limitation: CV 31 = 18 CV 32 = 0  CV's 260 - 263

Decoder Info: CV 31 = 255 CV 32 = 255     CV's 260 -264, 270 - 274

Mapping, alternative track signal - multiple unit: CV 31 = 17 CV 32 = 2   CV's 260 - 263, 270 - 273

**Mapping, function: CV 31 = 17 CV 32 = 0  For operation of CV’s 260 - 499**

Mapping, timer: CV 31 = 17 CV 32 = 1  CV's 261 - 264

Sound, individual volumes: CV 31 = 16 CV 32 = 0   CV's 257, 300 - 328

Voltage buffer: CV 31 = 18 CV 32 = 1    CV's 260, 263, 270 - 272, 280 - 282, 290

**Work in progress**



Test template to test correct operation of the LGB 55029 decoder.


Test template to check and verify correct values for CV 31 & CV 32.