Roco ‘Z21’ Digital System

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Latest update: 2 August 2015


Roco offers a digital system primarily aimed at the smaller scales, but it’s becoming increasingly popular with G scalers because of its relative low cost.


System Overview:

Let’s start with the bad news: the Roco system offers an output power of just 3 Amps. To overcome the limited power output, I’ve seen many people purchase an additional DCC booster (e.g. Heller) to provide enough power.

The system is reasonably priced and it offers a PC connection as well as mobile app for Android and Apple smartphones and tablets. The trains can be controlled using the Roco ‘multiMAUS’ controller as well.

Roco Z21 Digital System for G Scale

There are two versions of the system, the ‘z21’ and ‘Z21’. The Z21 (black) is the top-of-the-line model, the z21 (white) is a simpler version with limited connection and configuration capabilities.

Roco Z21 Digital System for G Scale

Roco Z21 Digital System for G Scale

The digital system comes with the central station unit, a WLAN router, and a power supply.

Roco Z21 Digital System for G Scale

Technical Specifications:

  • Output voltage: 11 – 23 V (adjustable)
  • Output power: 3 A

Pros & Cons:

+ Factory smartphone / tablet app for wireless operation
+ PC connection
– Limited output power

Links & Downloads: