Product Overview
The Roco 10836 Z21switch Decoder is a robust and durable building block designed for digital control in model railway systems. It functions as a switch decoder, enabling the control of turnouts, signals, and other accessories via a digital command station, such as the Z21 system. This decoder is built to withstand various conditions, featuring an IP66 rating for international protection.

Figure 1: Front view of the Roco 10836 Z21switch Decoder. The image displays the main unit with various connection terminals labeled for zLink, Prog, PWR DCC, and numbered outputs (1-8). Status indicators for Status, Error, Data, and Program are visible on the left side. The model number "10836" and "Roco" branding are prominently displayed.
Setup and Installation
Proper installation is crucial for the optimal performance of your Roco 10836 Z21switch Decoder. The device comes with necessary installation hardware.
Connecting the Decoder
- Power Connection (PWR DCC): Connect your digital command station's DCC track output to the PWR DCC terminals (+ and -) on the decoder. Ensure correct polarity.
- Accessory Outputs (A+B / B+A): The decoder features multiple output pairs (1-8). Connect these outputs to your turnouts, signals, or other accessories. Refer to the specific wiring diagram for your accessory type. Outputs 1-4 are labeled A+B, and outputs 5-8 are labeled B+A.
- zLink Connection: If your digital system supports zLink, connect the decoder to your Z21 central unit using the zLink port for advanced configuration and integration.
- Programming (Prog): The "Prog" port is used for initial setup and configuration of the decoder's address and output functions. Consult your Z21 system's manual for detailed programming instructions.
Mounting
Secure the decoder in a dry, accessible location within your model railway layout. Use the provided installation hardware to mount the unit securely, ensuring it is protected from physical damage and excessive heat.
Operating the Decoder
Once installed and programmed, the Roco 10836 Z21switch Decoder allows for digital control of your model railway accessories.
Status Indicators
- Status: Indicates normal operation.
- Error: Lights up if an error occurs (e.g., short circuit, overload).
- Data: Flashes when data is being received from the command station.
- Program: Indicates the decoder is in programming mode.
Controlling Accessories
Use your digital command station (e.g., Z21) to send commands to the decoder's assigned address. Each output pair (A+B or B+A) can be configured to control a specific accessory, such as a turnout motor or a signal light. Refer to your command station's manual for instructions on sending accessory commands.
Maintenance
The Roco 10836 Z21switch Decoder is designed to be durable and robust, requiring minimal maintenance. Its IP66 rating ensures protection against dust ingress and powerful water jets.
- Cleaning: Periodically clean the exterior of the decoder with a soft, dry cloth. Do not use abrasive cleaners or solvents.
- Environmental Conditions: While robust, avoid exposing the decoder to extreme temperatures, direct sunlight, or excessive humidity.
- Connection Integrity: Regularly check all cable connections to ensure they are secure and free from corrosion.
Troubleshooting
If you encounter issues with your Roco 10836 Z21switch Decoder, consider the following troubleshooting steps:
- No Response from Accessory:
- Check all wiring connections to the decoder and the accessory.
- Verify the decoder's address and the command sent from your digital station.
- Ensure the accessory itself is functioning correctly (test with direct power if possible).
- Error Light On:
- This often indicates a short circuit or overload on one of the outputs. Disconnect accessories one by one to identify the faulty connection or accessory.
- Check for any stray wires causing a short.
- Decoder Not Powering On:
- Verify the power connection from your digital command station to the PWR DCC terminals.
- Ensure your command station is powered on and functioning.
- Programming Issues:
- Ensure the decoder is correctly connected to the programming track or port.
- Follow the programming procedure outlined in your digital command station's manual precisely.
If problems persist, consult the Roco support resources or a qualified model railway technician.
Specifications
| Feature | Detail |
|---|---|
| Brand | Roco |
| Model Number | 10836 |
| Product Dimensions | 10.4 x 10.4 x 2.5 cm |
| Item Weight | 200 g |
| Special Features | Durable and robust with IP66 rating |
| International Protection Rating | IP66 (Dust tight and protected against powerful water jets) |
| Water Resistance Level | Waterproof |
| Number of Channels | 8 (4 A+B, 4 B+A) |
| Included Components | Installation hardware |
| Batteries Included | No |
| Colour | Various |
| Date First Available | 30 January 2024 |
Warranty and Support
Roco provides support for its products. For the Roco 10836 Z21switch Decoder, an EU Spare Part Availability Duration of 1 year is specified from the date of first availability.
For technical assistance, warranty claims, or further information, please refer to the official Roco website or contact your authorized Roco dealer. Keep your proof of purchase for warranty purposes.





