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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 NEM652 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 sound decoder masters ABC braking, ABC shuttle 

automatic, as well as ABC slow speed.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 outputsas well as via an additional special function output which can be 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. 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 NEM 652 interface. At the same place insert the 8-pin plug of the decoder 

carefully into the interface socket. Please note the coding of PIN 1 note. If the plug is turned 180°, the locomotive will run 

in the wrong direction and the light will not work. 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 A1

The special function output A1 of the PIKO SmartDecoder XP 5.1 can only be used if the desired consumer is already 

connected to the NEM 652 interface in the vehicle, or if there are solder pads on the main 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 motor sound F1 are switched on ex works.

#56613 PIKO SmartDecoder XP 5.1 Sound

NEM652 for Electric locomotives BR 185.2

multiprotocol, mfx® capability included

56613-90-7001_2021

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

200

6

Average speed

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

0 - 255

100

7

Firmware version

 (The processor can be updated)

-

differently

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

Licgt

F8

Automatic Spring Brake 

F16

Engine Room Door

F1

Sound

F9

Compressor

F17 Fan

F2

High Tone Horn

F10 Cab Door

F18

Conducter's Whistle

F3

Station announcement 1

F11 Cab Window

F19

Sanding

F4

Station announcement 2

F12

Pantograph

F20 Air Valve Release

F5

Volume control

F13

Dead Man's Peda

F21

Curve Squeal

F6

Tunnel mode

F14 Train Brakes

F22 Clickety-Clack

F7

Switching Gear

F15

Coupling

F23

-

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