Your ESU decoder is MTC compatible, it just doesn't have enough functions for you to control all the lights.
Dapol should have said MTC compatible plus a minimum of 6 powered functions.
Richard
Richard,
That's the problem, the ESU decoder
is 21MTC compatible, but the model
is not. The model expects to 'see' an 'Open Collector' function output on AUX3, which the ZIMO, TCS and others which follow the NMRA standards will provide.
ESU 21 pin decoders have Logic Level on Aux 3, and the'wrong polarity'. The pin is always live, therefore the rear lamps on this model cannot be switched off.
The 21 MTC specs (NEM660) require 'Logic Level' function outputs on Aux3 and above. In other words, there is no such thing as a 21MTC decoder which has 6 'powered', 'full power', 'normal' or more correctly 'open collector' function outputs.
The issue arises because the term 21MTC is used incorrectly by some to mean 'any 21 pin decoder'.
It's only because Dapol have used a function output above AUX 2 that this disparity has come to wider attention.
The sooner we move to the PluX interface the better, as it removes this problem altogether.
Kind regards,
Paul