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NOTE: Detailed information on the PIKO SmartDecoder XP 5.1 Sound is available as a PDF file on our 

Webshop on the page of the respective item number. The file contains a full description of all functions 

and operating possibilities for the new SmartDecoder XP 5.1 Sound. 
Description

The state-of-the-art PIKO SmartDecoder XP 5.1 Sound inside in this PIKO locomotive is a compact yet powerful multi-

protocol PluX22 sound decoder. It features high fidelity, 12 bit 8-channel sound with 2.5 watts of output that ensures 

distortion-free sound at all levels. It complies with the current RCN standards in all areas. The decoder can be used on 

DCC, mfx®, and Motorola® digital systems as well as traditional DC or AC analog layouts. It automatically senses what 

operating mode is used on your layout and is RailCom®/RailCom Plus® compatible. The PIKO SmartDecoder XP 5.1 

Sound features several programmable braking distance functions in addition to numerous other programmable functions. 

The PIKO SmartDecoder XP5.1 Sound is load-regulated and features auto-adaptive motor control that works with of 

a fundamentally newly developed  traditional DC motors for a silky smooth ride as well as 1.2 Amp coreless motors. 

The decoder will also tolerate a temporary current draw up to 2 Amps. The motor speed table can be set using the 

minimum, median, and maximum motor speed (simple curve), or by the user-programable 28-speed step extended 

curve. The decoder features two directional lighting outputs and seven additional special function outputs that can be 

activated using function keys up to F68 (DCC). The switching (shunting) gear, with extended slow speed range, the 

three possible starting and braking delays, as well as the many vehicle sounds are also switchable via function keys. 

The sound part can control specified function outputs as well as the motor output of the decoder. For example, the 

lighting of a diesel locomotive flickers when the engine is started. The PIKO SmartDecoder XP 5.1 is supported by the 

further developed power management in case of short-term voltage loss.

Installing the PIKO SmartDecoder XP 5.1 Sound

Remove the jumper plug from your model’s PluX22 interface. Insert the new sound decoder into the interface socket. 

Note that PIN 11 is missing on the new decoder. Please install the loudspeaker as shown in the graphic of the "Spare 

parts list".

 

Check for crossed wires and short circuits before and after reinstalling the shell. Place the model on your 

programming track with programming mode activated on your DCC system. During programming or when reading the 

model’s DCC address, a small amount of current will flow through the model, which does not affect the decoder; even 

in the event of a short circuit.

Special function outputs A1 to A7

The decoder’s special function outputs A1 to A7 can only be activated if the desired functions are already connected to 

the model’s PluX22 interface or if solder pads are available for the special function outputs on the main circuit board.

First-time use of the decoder (state of delivery)

Enter address 3 on your digital control system. Depending on the data format used to address the sound decoder, 

the locomotive runs in DCC mode with 28 speed steps or in Motorola® mode. When using a RailCom Plus®-enabled 

system or with an mfx®-capable system, the decoder is detected automatically and can be operated immediately. If 

the decoder is used on a conventional analog layout, it can be controlled with a DC or AC power pack. The decoder 

will automatically detect the layout’s operating mode.

NOTE: In DC mode, your vehicle will not start until the voltage is higher (speed control turned up further) than you 

may have been used to when operating with analog vehicles.

Function outputs in analog mode

It  is  possible  to  program  the  decoder  so  that  function  keys  F0  -  F12  (as  they  are  assigned  in  the  function 

mapping)  can  also  be  activated  in  analog  mode.  To  do  this,  CVs  13  &  14  must  first  be  programmed  with  a 

central control unit. The corresponding values can be found in the CV table of the detailed operating instructions. 

 

The light function F0 and the traveling sound F1 are switched on at the factory.

#56598 PIKO SmartDecoder XP 5.1 Sound

PluX22 for Electric locomotives V 43 MAV H0 

multiprotocol, mfx® capability included

56598-90-7001_2022

Function assignments

PIKO Spielwaren GmbH 

Lutherstr. 30

96515 Sonneberg

GERMANY

A short circuit in the motor, lighting, pick-up wiper, or wheelsets can destroy the 

decoder as well as the electronics of the model! 

CV

Description

Area

Value*

1

Locomotive address

DCC: 1 - 127

 

Mot: 1 - 80

3

2

Minimum speed

 (the speed from 0 until the locomotive is running at speed step 1)

0 - 255

0

3

Acceleration delay

0 - 255

50

4

Braking delay

0 - 255

30

5

Maximum speed

 (must be greater than CV 2)

0 - 255

180

6

Average speed

 (must be greater than CV 2 and less than CV 5)

0 - 255

90

8

Manufacturer's ID

 Decoderreset CV8 = 8

different

162

12

Decoder operating mode

Bit 0=1 DC (analog operation; direct current) on

Bit 2=1 DCC data format on

Bit 4=1 AC (analog 3-rail operation; alternating current) on

Bit 5=1 Motorola® data format on

Bit 6=1 mfx® data format on

Value

*1

*4

*16

*32

*64

 

0 - 117

117

17

18

Long locomotive address

17 = high Byte

18 = low Byte

1 - 10239

192 - 231

0 - 255

1000

195

232

27

Brake signal settings (automatic stop)

Bit 0 = 1 -> ABC (Automatic Brake Control) right rail positive

Bit 1 = 1 -> ABC left rail positive

Bit 4 = 1 -> DC; opposite direction of travel

Bit 5 = 1 -> DC; same direction of travel

Value

1

2

16

32

0 - 51

0

29

DCC standard configuration

Bit 0=0 Normal direction of travel

Bit 0=1 Opposite direction of travel

Bit 1=0 14 speed steps

Bit 1=1 28 speed steps

Bit 2=0 Digital mode only

Bit 2=1 Automatic analog/digital recognition

Bit 3=0 RailCom® turned off

Bit 3=1 RailCom® turned on

Bit 4=0 Speed steps over CV 2, 5, and 6

Bit 4=1 Use the characteristic curve from CV 67 - 94

Bit 5=0 Short address (CV1)

Bit 5=1 Long address (CV 17/18)

Value

*0

1

0

*2

0

*4

 

0

 

*8

 

*0

16

*0

32

0 - 63

14

30

Error codes for the motor, thermal overload, and function outputs:

1 = motor error, 2 = thermal overload error, 4 = function output error

0 - 7

0

* set ex works

F0

Light

F7

Switching Gear

F14

Pantograph

F1

Engine

F8

High Beam

F15

Compressor

F2

Horn (1x Short / 2x Long)

F9

Train Lighting: Engine pulling

F16

Cab Door

F3

Cab Light 1

F10

Train Lighting: Engine pushing

F17

Engine Room Door

F4

Cab Light 2

F11

Switching Manual / Automatic

F18

Cab Window

F5

Engine Room Lights

F12

Manual Fan

F19

Volume Regulator

F6

Capsdesk Light*

F13

Emergency Brake

F20

Tunnel mode

*Direction-dependent

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