Introduction
This manual provides essential information for the proper use, installation, and maintenance of your RJ12 (6pin) flat data cable. This cable is designed to connect various Mastervolt devices, facilitating reliable data transfer.
Product Overview
The Mastervolt RJ12 6PIN Smart Data Cable is a flat, easy-to-install cable designed as an alternative to standard bulky round cables. It ensures seamless communication between compatible Mastervolt equipment.
Key Features:
- RJ12 (6pin) to RJ12 (6pin) flat cable design.
- Easy installation due to flat profile.
- Compatible with various Mastervolt devices including:
- Smart models: 12/35-3, 12/50-3, 24/15-3
- Mass Sine Ultra
- Mass Combi Ultra
- Mass Combi Pro
- Mastervolt Control Panels
- Mastervolt Battery Chargers
- Mastervolt Inverter Units
- Available in various cable lengths.

Figure 1: A coiled white RJ12 6PIN Smart Data Cable, showcasing its flat design and one connector end.
Setup and Installation
The RJ12 6PIN Smart Data Cable is designed for straightforward plug-and-play installation. Ensure that both devices you intend to connect are powered off before proceeding with the connection.
- Identify Ports: Locate the RJ12 (6pin) data ports on your Mastervolt devices. These ports are typically labeled for data communication.
- Connect First End: Gently insert one end of the RJ12 cable into the designated port on the first Mastervolt device. Ensure the connector clicks securely into place.
- Connect Second End: Insert the other end of the RJ12 cable into the designated port on the second Mastervolt device. Again, ensure a secure connection.
- Verify Connection: Once both ends are connected, you may power on your devices. The cable will facilitate data communication between them.

Figure 2: The RJ12 6PIN Smart Data Cable uncoiled, showing both RJ12 connectors ready for connection.
Operating Instructions
Once properly connected, the RJ12 6PIN Smart Data Cable operates passively to enable data communication between your Mastervolt devices. No specific user interaction with the cable itself is required during operation.
- The cable facilitates the exchange of data signals between connected Mastervolt units.
- Refer to the user manuals of your specific Mastervolt devices for details on their data communication protocols and functionalities.
- Ensure the cable is not bent sharply or subjected to excessive tension during operation to prevent damage to the internal wires.
Maintenance
The RJ12 6PIN Smart Data Cable requires minimal maintenance to ensure its longevity and reliable performance.
- Cleaning: If the cable or connectors become dusty, gently wipe them with a dry, soft cloth. Avoid using liquid cleaners directly on the connectors.
- Storage: When not in use, store the cable in a cool, dry place, away from direct sunlight and extreme temperatures. Avoid tightly coiling or kinking the cable.
- Inspection: Periodically inspect the cable for any signs of wear, such as frayed insulation, exposed wires, or damaged connectors. If damage is observed, replace the cable immediately.
- Connector Care: Keep the metal pins of the RJ12 connectors clean and free from debris. Do not force connectors into ports.

Figure 3: A close-up view of two RJ12 6PIN connectors, highlighting the gold-plated pins and clear housing.
Troubleshooting
If you experience issues with data communication between your Mastervolt devices, consider the following troubleshooting steps:
| Problem | Possible Cause | Solution |
|---|---|---|
| No data communication | Cable not securely connected. | Ensure both RJ12 connectors are fully inserted and clicked into their respective ports. |
| No data communication | Damaged cable. | Inspect the cable for visible damage (cuts, kinks, bent pins). Replace if damaged. |
| Intermittent connection | Loose connection or minor cable damage. | Reseat the cable. If issues persist, try a different RJ12 cable to rule out cable fault. |
| Incompatible device | One or both devices do not use RJ12 6PIN for data. | Verify that both Mastervolt devices require an RJ12 6PIN data cable for communication. Consult their respective manuals. |
Specifications
| Attribute | Detail |
|---|---|
| Connector Type | RJ12 (6pin) to RJ12 (6pin) |
| Cable Type | Flat Data Cable |
| Compatibility | Mastervolt Smart models (12/35-3, 12/50-3, 24/15-3), Mass Sine Ultra, Mass Combi Ultra, Mass Combi Pro, Control Panels, Battery Chargers, Inverter Units. |
| Manufacturer | Generic |
| ASIN | B09QJ8VQPL |
| First Available Date | January 5, 2022 |
Warranty and Support
Information regarding specific warranty terms for this generic RJ12 6PIN Smart Data Cable is not provided in the product details. For any support or warranty inquiries, please refer to the seller or the platform where the product was purchased.
For technical support related to your Mastervolt devices, please consult the official Mastervolt documentation or their customer support channels.





