In the article we will go over the pinout of the Rhombus DC20.
DC20
The DC20 is a 4-Door Access Controller that is cloud-managed, secure by default, and built for enterprise scalability. The DC20 pairs seamlessly with Rhombus Access Control devices and existing door hardware.
Door Relays
The DC20 is equipped with six Form C relays with both Normally Open (NO) and Normally Closed (NC) contacts that can be used to control door locks and auxiliary devices.
Four of the relays can be used alongside four individually selectable 12VDC or 24VDC power supplies to control power delivered to locking hardware. Maximum current per output is limited to 830mA at 12VDC and 415mA at 24VDC.
NOTE: Before powering the DC20, be sure to select the appropriate voltage [12VDC] or [24VDC] for your end device.
Inputs
The DC20 includes a single pair of the Request to Exit (REX) and Door Position Indicator (DPI) for each of the four doors available for the DC20. DC20 inputs are compatible with contact-type devices with a NO or NC state. To connect a device to the input, simply connect the two output wires of the end device to the input. The default state (NO or NC) can be configured through the Rhombus App or Console.
An auxiliary input labeled [AUX] can be used to receive contact-type inputs from devices such as intercoms or intrusion alarm panels and can trigger events created in the Rhombus Console.
Door Readers
The DC20 comes with the ability to add four Wiegand readers and four RS-485 Readers (Rhombus or OSDP protocol readers).
NOTE: You can only have four total virtual doors in operation at one time on the DC20. A virtual door can have more than one physical badge reader (Wiegand or RS-485 ports) associated with it, but not more than one door relay.
Wiegand
The Wiegand terminals provided on the DC20 are Data Low (D0), Data High (D1), Terminals (OUT1) & (OUT2), Ground (GND) and 12VDC power. Power for the Wiegand reader is rated for 660mA each. Terminals (OUT1) & (OUT2) are configurable in Rhombus Console to support LEDs and buzzers.
RS-485
DC20 is compatible with Rhombus DR20 Reader, DR40 Video Reader, and certified third-party door readers using OSDP protocol over RS-485. The 12VDC power supply in the “WIEGAND” section can be used for RS-485 readers and powered input devices up to 670 mA per output.
Note: Power for the DR40 ONLY cannot come from the DC20. Power to the DR40 reader can be supplied using POE or a 12-28VDC external power source.
POWERED REMOTELY: In the case that an RS-485 reader is not powered by the DC20, a ground wire must still be wired back to a [GND] terminal on the “RS-485” section of the DC20.
Power
The DC20 is included with a 100-240VAC to 12VDC power adapter. The power cord is secured to the main board by a pluggable screw terminal. Once all other connections have been made and terminal contacts are screwed firmly in place, ensure the pluggable terminal end of the power adapter is connected before plugging the adapter’s power cord into a 100-240VAC wall outlet.
Tamper
An onboard accelerometer and proximity sensor will detect any significant movement of the DC20 and the enclosure cover. A 2-position terminal is also available to connect an optional wired contact sensor. Movement detected by any of the 3 sensor types can be configured to generate an event in the Rhombus Console. Before powering up the DC20, ensure cables are not obstructing the view of the proximity sensor.
Ethernet
The DC20 supports 10/100BASE-TX ethernet. Use a CAT5 or CAT6 cable with RJ45 connector. Plug an ethernet cable into the RJ45 jack.
Recommended Wiring
Wiring methods used shall be in accordance with the National Electrical Code, ANSI/NFPA 70. All wiring of the DC20 should be performed prior to connecting power. Power should be removed before attempting to service the DC20 or any of its connected devices. Below is a wire type and size for the types of terminals.
Please Note: We recommend that you consult with the appropriate federal, state, and local authorities for any relevant regulations at the time of installation.
Troubleshooting
Below is some quick troubleshooting methods for the Rhombus DC20. If you are unable to resolve the issue with the DC20 go ahead and open a support ticket by Contacting Support.
Reset Button
Press the RESET button when you are instructed by the controller display or a technical support representative to reset the DC20.
LED Indicators
Each relay on the DC20 has a green status LED indicator. When the relay is in an energized state, the indicator will illuminate. Conversely, the indicator will extinguish when the relay is de-energized.
Helpful Links
- Rhombus Access Control Deployment Guide and Best Practices (Access Control Manuals)
- Installing/Registering the DC20
- Installing a Request-To-Exit (REX) Sensor on the DC20
- Setting up Access Control Door in Rhombus Console
- Installing Magnetic Locks with the DC20
- Installing Electric Strikes with the DC20
- Installing a DPI Sensor on the DC20
- Installing a Wiegand Reader to the DC20
- Installing/Registering the DR40
- Installing a Request-To-Exit (REX) Sensor on the DC20
- Installing/Registering the DR20
Contact Support or Sales
Have more questions? Contact Rhombus Support at +1 (877) 746-6797 option 2 or support@rhombus.com.
Interested in learning more? Contact Rhombus Sales at +1 (877) 746-6797 option 1 or sales@rhombus.com.
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