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Wire a TD52 Video Intercom
Wire a TD52 Video Intercom

Learn how to wire a Verkada TD52 Video Intercom

Updated over a week ago

The Verkada TD52 Video Intercom provides a Power over Ethernet (POE) port to enable communication with your Verkada Command dashboard and 3 input/output (I/O) ports.

Wire the TD52 into your network

Required. The TD52 requires a (PoE/PoE+)-enabled switch port.

Power: 11.5W (IEEE 802.3af PoE)

Extended Temperature Range: 25.5W (IEEE 802.3at PoE)

The back of the TD52 has an I/O cover is secured by 4 screws that hold the I/O cover in place.

  1. Using a #2 Phillips head, remove these 4 screws.


  2. Plug the the Ethernet cable to provide power to the Intercom.

  3. Remove the rubber grommets (circular components) using the included grommet punch. The Ethernet chord goes through the grommet to create a water tight seal.

The intercom should power on and the status LEDs display on the face of the Intercom. Read about what each LED status indicates.

Wire the I/O port

The TD52 provides space in the I/O port for 2 inputs and 1 output.

Input device options

Output device options

  • Call triggers

  • Door Position Indicator (DPI)

  • Request to Exit (REX)

  • Door unlocks

  • Chime

  • Call in progress

Example: I/O ports when the cover is removed

Each I/O port corresponds to the following pins from left to right:

To simplify the I/O port wiring, remove the I/O terminal. You can use a Torx security screwdriver provided in the box or any tool that allows you to lever the terminal away from the device.

Wire an input device

Looking at the I/O terminal, the 3 ports closest to the right are for inputs:

  • IN2 (Pin 10)

  • IN1 (Pin 9)

  • GND (Pin 8)

  1. Choose which port(s) the input(s) to wired into.

    Note the number input; this corresponds to an input number in your Intercom settings. For example, a door position indicator (DPI) wired into IN1/Pin 9 and a Request to Exit (REX) wired into IN2/Pin 10.

  2. Press and hold the orange push button to insert the second wire of input device into ground (Pin 8/GND).

    • You can use the same ground port when 2 inputs are installed.

    • The example shown is an Intercom I/O terminal with 2 input devices attached, both of them using the same ground port.

Example wiring scenarios

REX / Call Trigger

Door Contact / DPI

Required. When wiring an Intercom as an access controller, you must wire the REX into Input 2 (IN2) and DPI into Input 1 (IN1).

Power your input device using an external power supply

To wire using an external power supply, take the positive (+) and negative () wires from the input device and then wire it into the power source.

Example: How to wire a powered REX/call trigger into an external power supply

Wire an output device

Looking at the I/O board, the 3 ports closest to the left:

  • NO (Pin 1)

  • COM (Pin 2)

  • NC (Pin 3)

  1. Using the orange push button on the terminal block, insert the negative wire (–) into COM (Pin 2). This wire will be inserted into the ground (GND) or negative (–) on your output device.

  2. Determine what relay state the output device requires to be triggered, then use the orange push button to insert the second wire into Normally Open (NO) or Normally Closed (NC).

    • If the output device expects NO, then put the '+' wire into NO/Pin 1.

    • If the output device expects NC, then put the '+' wire into NC/Pin 2.

    • This wire will be inserted into the input (IN) or positive (+) on your output device.

  3. Select the appropriate output setting for the output in the Verkada Command dashboard.

Note: The TD52 uses a dry relay, which means that it cannot power an output device. All output devices that require power need to use an external power controller or power supply.

Wire a reader

Example wiring scenarios

Door unlock

The door unlock allows for the output relay to trigger when an unlock is sent from the receiver. In both wiring scenarios, the lock is attached to an access power controller.

Using a fail secure lock

Using a fail safe lock

Related resources


Need more help? Contact Verkada Support

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