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SD-34 | SD-34.2
2. Operation overview
The switching decoders SD-34 and SD-34.2 are designed to control accessories, switched on
and off or changed over via a change-over relay, e.g.
lightings,
light signals,
motor-run turnouts with limit switching.
With one switching decoder you can control a maximum of four accessories independent of
each other.
Driving the decoder via accessory decoder commands
The outputs of the decoders SD-34 and SD-34.2 are operated via accessory decoder
commands in DCC or Motorola format, sent from the central unit to one of the four turnout
addresses. The decoders automatically recognize the commands´data format. It is possible to
switch the outputs via mixed DCC and Motorola commands as well as to operate one output
alternately in DCC and Motorola format.
Operation via vehicle decoder commands ( SD-34.2 only)
You can use a vehicle decoder address (locomotive address) to operate the switching decoder
SD-34.2 instead of turnout addresses. The 4 outputs of the decoder are switched via the
function keys F1 to F4 then. This allows to use the SD-34.2 in combination with DCC control
units not designed for controlling turnout addresses. Note: The changeover to the use of
locomotive addresses is only possible with a DCC control unit.
Programming
Using a DCC central unit the decoder address and the decoder´s features can be defined by
programming the configuration variables (CV). It is also possible to set the address by using a
programming jumper (SD-34) or a push-button switch (SD-34.2).
When using a Motorola central unit the address has to be set with a programming jumper
(SD-34) or a push-button switch (SD-34.2). Changing the other decoder´s features or
assigning a locomotive address is neither necessary nor possible in layouts run in Motorola
format only.
Feedback via RailCom
The switching decoders SD-34 and SD-34.2 are RailCom compatible, i.e. the decoders are able
to pass the RailCom messages via the rails to special RailCom detectors. This allows e.g. to
feedback the correct performance of setting and switching commands.
Power supply
The switching decoders SD-34 and SD-34.2 and the connected accessories can be supplied
either with digital voltage from the booster circuit, i.e. via the integrated booster of the
digital central unit or a separate booster,
or via its own transformer to relieve the digital circuit.
6 | Operation overview
®
(according to RCN-217)
tams elektronik
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