Installing/Registering the DC20 – Rhombus Support

In this article we'll discuss the steps for installing and registering the DC20.

General Specs of the DC20
Mounting the DC20
Included parts in box
Wiring for the DC20
How to Install a Backup Universal Power Supply (UPS) to DC20
Registering the DC20

General Specs of the DC20

The DC20 is a four-door controller that is cloud-managed, secure by default, and built for enterprise scalability. It pairs seamlessly with Rhombus Access Control devices and existing door hardware. Each DC20 has inputs for Wiegand readers, OSDP readers, REX buttons, DPI sensors, electric locks, and more!

Here's a diagram of the control board:

Mounting the DC20

The DC20 is intended to be wall mounted indoors in a secured area, such as a locked server room or utility closet.

To install, pre-drill pilot holes into the desired mounting surface in accordance with the mounting specifications provided. Note that a 3/16” pilot hole is required if you're using wall anchors.

An alternative pre-drilling option utilizes the extra mounting screw included to hang the DC20 through the center keyhole slot located in the back of the device. Once levelled, the four hole locations can be marked on the mounting surface and pre-drilled.

After the holes have been pre-drilled, fasten the device to the surface using the included mounting screws. The DC20 can be mounted on surfaces such as metal or concrete but appropriate #8 screws should be used.

Included Parts in box

Below is a list of the included parts in the box with the DC20.

Wiring for the DC20

Wiring methods shall be in accordance with the National Electrical Code, ANSI/NFPA 70.

All wiring of the DC20 should be performed prior to connecting the power. Power should be removed before attempting to service the DC20 or any of its connected devices.

WARNING. Failure to remove power prior to servicing the DC20 may result in damage to connected devices.

Wire Type and Size:

	Wire Type	Twisted Pair	Shielded	Minimum Size	Maximum Length
Lock Power	Solid or Stranded	-	-	18 AWG	300 ft
Reader Power		-	Yes	18 AWG	300 ft
Reader Data		Yes		24 AWG	300 ft
Inputs		-		24 AWG	300 ft

How to Install a Backup Universal Power Supply (UPS) to the DC20

The DC20 has provisions for a backup battery to support offline mode in case there is a loss of primary power. The battery must be 12V Sealed Lead Acid (SLA) type, with F1 or F2 style connectors. The maximum space reserved for a standby battery(s) is 300mm L x 80mm W x 110mm H. Two new and unused batteries of the same make and model may be wired together in parallel to increase standby capacity.

The battery capacity should be sized appropriately based on the power consumption of the overall system and the desired run time during an outage. Many factors include, but are not limited to, the type of powered devices used (locks, readers, and other power accessories), unlock frequency, battery age, and even ambient temperature can affect the total backup duration.