All connections of the Z21 XL series

Main Track

● 6 A
● Short circuit detection optimized for big scales

However the track voltage can not be adjusted and depends on the used power supply. 

2 Rails DCC


DCC Loco-Decoder

  • 14/28/128 speed steps
  • F0 to F28
  • POM read nbsp#write


DCC Turnout- and Signal-Decoder

  • Configuration of sophisticated decoder 
  • 2048 DCC-turnouts 

3 Rails MM


MMI and MMII Loco-Decoder

  • MMI: Address 1 to 80 and 14 speed steps
  • MMII: Addresse 1 to 255 and 28 speed steps


MM Turnout-Decoder

  • 255 MM turnouts possible


Prog Track - Programming track

  • CV Programming
    According NMRA S-9.2.3
    Reading/writing CV bit- and byte-wise 
    In direct mode
  • MM Programming
    6021 programming mode
    Z21 FW V1.23 or higher
  • Decoder Update for Zimo decoders
    with Z21 Maintenance Tool
Hint: CV programming can be cancelled by shortly pessing the STOP key

LED Status

Constant blue - Normal operation

Lit in green - Programming mode

Flashing green - Decoder update

Flashing blue - STOP

Flashing red - Short circuit

Sniffer BUS

Driving and switching by using your existing legacy DCC digital command station (output voltage of 16 V or higher required).


At any time you can take over the loco with another throttle (or App) connected to the Z21.


The direction of communication is always from the legacy command station → into the Z21.


Booster BUS

10869 - Z21 XL BOOSTER

To guarantee the full functionality we recommend to use CAN. 


10789 - Z21-CDE Booster Adapter

10-15 Booster with CDE interface

LocoNet™ BUS

1. Currently supports more than 21 tested hand controllers and feedback modules of a wide range of manufacturers: 

Z21 FW V1.24 or higher

LocoNet T (Master) 12 VDC, 500 mA


Profi-BOSS as LocoNet™ Slave






Funkmaster update

IRIS + 63830 IR-Receiver



TWIN-CENTER, Intellibox 1, TWIN-CONTROL, IB-Control

LocoNet™ Slave






Power supply

63400, 63410

Input/output module

Blücher GBM16XL

Occupancy detector

Blücher GBM16N

LocoNet™ Interface

Occupancy detector

Train detection using RailCom®


Following modules are not compatible with the Z21:

  • LocoNet™ Booster
  • BDL168, RX4
    Occupancy detector using transponding


Following modules are not compatible with full bridge power circuits and must not be connected to Z21 or Digitrax command stations:

  • MARCo
  • 63330, 63350
  • 68720, 68730

TWIN-CENTER: Slave mode with FW V2.000 via special option 844 = 1

Intellibox 1: Slave mode with FW V2.001 via special option 844 = 2

(i. e. LocoNet™ power source = off)


Activating LocoNet™ slave mode on PROFI-BOSS:

1. C + alt
2. Change MASTER to SLAVE 
3. Confirm


* Take over a loco address by using dispatch procedure in Z21 Maintenance or Z21 app

The L-BUS also permits connection via a multiZENTRALEpro to the multiMAUSpro

2. L-BUS enables the connection to multiMAUSpro via multiZENTRALEpro


Z21 FW V1.24 or higher with Z21 as LocoNet master



FW V1.09 (LocoNet™ slave)



Connect to EXT. 

The multiZENTRALEpro is the LocoNet™ slave and is powered by ther Z21 (12 VDC).

So do not use any power supply for the multiZENTRALEpro!

Connect the tracks with the LocoNet™ master.


Z21 multiMAUS firmware update and language change by using Z21 Maintenance

Feedback module (e. g. 10787) for momentary or permanent contacts

20 modules with ascending adresses

8 inputs per feedback module

  • Combinable with circuit tracks (e. g. 61117, 42518 ...)
  • Combinable with sleeper with built-in reed switch (e. g. 42605, 61193 ...)

Blücher GBM16XN

XpressNet™ Interface

GBM FW V1.11.2 or higher


31 devices can be connected to the X-BUS of the Z21.
Including the following:



Route Control

Lenz LH100

Lenz LH30

Lenz LH90 - Z21 FW V1.24 or higher

Funky - Z21 FW V1.24 or higher


LAN mobile

Connection to the following programmes

Z21 app (Previous version)


Connection to following programmes


Zimo MX32

Z21 FW V1.25 or higher and Zimo FW V01.15 

CdB electronics

CdB electronics
Switching decoder

CdB electronics
Feedback decoder

CdB electronics
Track diagram control panel

CdB electronics
CAN control panel