Commax Dp-ra01 Installation Manual Jun 2026

Intercom installation involves electrical components. Always follow these safety basics:

This is where most DIYers get stuck. The DP-RA01 has a terminal block on the back (or on the mounting plate) with numbered posts. Here is the standard Commax 4-wire color coding logic.

| Problem | Likely Cause | Solution | |---------|--------------|----------| | No power (no LED) | +/- reversed or loose | Check terminal connections | | No video, but audio works | V terminal loose or camera fault | Re-crimp V wire; test camera separately | | No chime on call | Call wire not connected | Verify C terminal on both ends | | Buzzing/humming | Ground loop | Ensure - terminal is common to all devices | | Monitor beeps constantly | Call button stuck | Disconnect CALL wire; if stops, replace button | commax dp-ra01 installation manual

| Symptom | Likely Cause | Fix from Manual | | :--- | :--- | :--- | | No power, no screen | + & C reversed or loose | Check polarity. Red to +, Black to C. | | Video is snowy or rolling | V wire poor contact or too long | Re-crimp V terminal; shorten cable to <50m. | | Can hear but no video | V wire disconnected | Use multimeter to check continuity on V line. | | Won’t ring (call button) | A wire broken | Connect Green to A at both ends. | | Door unlock doesn’t work | Wrong lock wiring | Ensure lock power is separate; DP-RA01 only sends dry contact. | | Static in audio | Ground loop | Verify C terminal is solidly grounded at PSU. |

: Secure the included wall-mounting bracket to a flat surface using the provided screws. Wiring Connections : Intercom installation involves electrical components

Ensure your local power supply is compatible with the AC power requirement (usually 220V ~, 50/60Hz).

The is an audio interphone station designed for single-house or multi-unit sub-station use. It features a 2-wire connection to the door station and a 2-wire connection for the door release. Installation & Wiring Guide Here is the standard Commax 4-wire color coding logic

These dials are located behind a small cover or on the side of the unit.

A -- “2-Wire Communication Line” --> B C -- “+12V, GND” --> B B -- “Power & Communication (5-Wire)” --> D

Ensure the external power supply for your door strike is turned on and wired in a complete circuit with the DP-RA01 SW terminals. What is the approximate of your wire run?