RHOMBUS DR20 User manual

DR20 Door Reader
User Manual
Revision 1.0 23092

2DR20 User Manual
Contents
System Overview 04
Mounting Instructions 05
Recommended Wiring 06
Operation 07
Registration 08
Specications 08
Troubleshooting
Appendix
09
10

3
DR20 User Manual
Service and installation should only be performed by trained personnel.
FCC Compliance Statement
This equipment has been tested and found to comply with the limits for a Class A digital device,
pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection
against harmful interference when the equipment is operated in a commercial environment. This
equipment generates, uses, and can radiate radio frequency energy and, if not installed and used
in accordance with the instruction manual, may cause harmful interference to radio communica-
tions. Operation of this equipment in a residential area is likely to cause harmful interference in
which case the user will be required to correct the interference at his own expense.
IC Compliance Statement
This device complies with Industry Canada’s license-exempt RSSs. Operation is subject to the fol-
lowing two conditions:
(1) This device may not cause interference; and
(2) This device must accept any interference, including interference that may cause undesired
operation of the device. The device has been evaluated to meet general RF exposure requirement.
The device can be used in portable exposure condition without restriction.
Le présent appareil est conforme aux CNR d’Industrie Canada applicables aux appareils radio
exempts de licence. L’exploitation est autorisée aux deux conditions suivantes:
(1) L’appareil ne doit pas produire de brouillage, et
(2) l’utiliateur de l’appareil doit accepter tout brouillage radioélectrique subi, même si le
brouillage est susceptible d’en compromettre le fonctionnement L’appareil a été évalué pour
répondre aux exigences générales en matière d’exposition aux RF. L’appareil peut être utilisé en
condition d’exposition portable sans restriction.
WARNING messages will be fully boxed as shown here. Failing to follow instruction may result
in damage to the DR20 or other connected components.
Date
9/22/2023 A Initial Release
Revision Notes

4DR20 User Manual
Tools You’ll Need:
• Phillips #2 screwdriver
• Pen or pencil for marking drill locations
• Power drill and 1/4” drill bit for wall
anchors or 1/8” drill bit for screw pilot 1
• 1-3/8” Hole Saw
Included in the box:
• DR20 Door Reader
• (2) Wall anchors
• (2) #8 FH wall screws
• (2) 8-32 outlet box screws
• (1) T6 Torx Key
• (1) Extra T6 security screw
x3 x3 x3 x1 x1
DR20 Overview
Quickly access your spaces by card, mobile app, or wave-to-unlock gestures with the DR20 Door
Reader — a modern, touchless, and reliable smart reader.

5
DR20 User Manual
Mounting the DR20
STEP 1
To install, pre-drill pilot holes into the desired
mounting surface in accordance with the mounting
specifications provided (see Appendix). Note that a
3/16” pilot hole is required if using the wall anchors.
STEP 2
Remove the mounting bracket from the reader by
unscrewing the T6 screw at the bottom of the device.
Fasten the mounting bracket to the surface using
the included wall screws and ensure that the arrow
symbol on the bracket is pointing up.
STEP 3
After wiring is completed, pass the DR20 cables
through the hole and slide the reader into the
mounting bracket.
Ensure that the tab at the top of the mounting
bracket is inserted into the top slot of the DR20.
STEP 4
While holding the DR20 in place, insert and tighten
the T6 screw back into the bottom of the bracket
using the torx key provided.

6DR20 User Manual
Recommended Wiring
Wiring methods used shall be in accordance with the National Electrical Code, ANSI/NFPA 70.
All wiring of the DR20 should be performed prior to connecting power. Power should be removed
before attempting to service the DR20 or any of its connected devices.
DR20 is compatible with the Rhombus DC20 Door Controller and communicates using OSDP
protocol over RS-485. Connect the [A], [B] and [GND] lines of the DR20 to the corresponding
terminals in the DC20.
Wire Type and Size
WARNING: Failure to remove power prior to servicing the DR20 may result in damage to
connected devices.
Reader Power
Reader Data (RS-485)
Solid or Stranded
Solid or Stranded
Wire Type
—
Yes
Twisted
Pair
Yes
Yes
Shielded
18 AWG
24 AWG
Minimum
Size
300 ft
300 ft
Maximum
Length
G
ND
A
B
G
ND
A
B
G
ND
A
B
G
ND
A
B
1
2
3
4
RS-485
GN
D
+
12V
+12V
G
N
D
E
THERNET
BATT
12VD
C
S
LA
O
NL
Y
PWRIN
TAMPER
AUX
G
ND
RE
X
DPI
1
REX
DPI
2
REX
DPI
3
REX
DPI
4
INPUTS
RESET
N
CO
M
NO
N
CO
M
NO
N
NO
CO
M
G
ND
V
CC
N
NO
C
OM
G
ND
V
CC
N
NO
CO
M
G
ND
V
CC
N
NO
CO
M
G
ND
V
CC
D
OO
R RELAY
S
A
U
X
1
2
3
4
1
2
1
2VD
C
24VD
C
1
2VD
C
24VD
C
1
2VD
C
2
4VD
C
1
2VD
C
2
4VD
C
D
C2
0
rh
o
m
bus
GND
A
B
GND
A
B
GND
A
B
GND
A
B
1234
RS-485
WIE
G
AND
WIEGAND
1
1
2
2
3
3
4
4
+12V
+12V
G
ND
GND
OU
T2
OUT2
OU
T1
OUT1
D1
D1
D
0
D0
+12V
+12V
G
ND
GND
O
UT2
OUT2
O
UT1
OUT1
D1
D1
D
0
D0
+12
V
+12V
G
ND
GND
OU
T2
OUT2
OU
T1
OUT1
D1
D1
D
0
D0
+12V
+12V
G
ND
GND
OU
T2
OUT2
O
UT1
OUT1
D1
D1
D
0
D0

7
DR20 User Manual
Power to the reader can be supplied directly by the 12VDC power supply in the “WIEGAND”
section of the DC20 Door Controller. Alternatively, an external power supply can be used. Note that
DR20 requires 8-28VDC with a maximum power of 4.8W. Refer to Recommended Wire Type and
Size table above for more wiring detail.
Operation
The DR20 proximity sensor allows for touch-free access using Bluetooth if set-up on the mobile
app.
DR20 is compatible with most NFC card types including mobile NFC for iPhone(R) and Android(R)
devices. DR20 also facilitates Touchless Entry with your mobile device’s Bluetooth, Location, and
other onboard services.
During a network disconnection, Access Control functionality will be preserved, however, user
grants and schedules cannot be updated. Once the network connection has been restored to the
controller, all alerts, movements, and access control configurations will be updated automatically.
Proximity Sensor
Accepted Credentials
Ofine Mode
1
+12V
GND
OUT2 OUT1
D1 D0

8DR20 User Manual
Registration
Specications
To get started, scan the QR code provided with the DR20 or visit
www.rhombus.com/setup/dr20
General
Dimensions: Mullion 50 mm x 130 mm x 20 mm
[1.97 in x 5.12 in x 0.79 in]
Weight: 0.31kg (0.7lbs)
Mounting: Wood/drywall screws Included
Credential
Frequency: 13.56 MHz
Credential Compatibility: Rhombus Badge, ISO 14443A (CSN), Rhombus Key app
Connectivity/Power
Controller Compatibility: DC20
Input Voltage: 8-28VDC
Power Consumption MAX: 4.5W
Environmental
Operating Temperature: -40˚C to 50˚C [-40˚F to 122˚F]
Operating Humidity: 10%-90% RH
Weather Resistance: IP65
FCC, UL 294, CE, RCM, AUS and NZ Compliant
Getting Started

9
DR20 User Manual
Troubleshooting
If the DR20 needs to be power cycled, remove the reader from the mounting bracket and unplug
the device from the power source. Leave unplugged for around 30 seconds before reconnecting.
See the appendix for a complete list of DR20 LED Ring patterns.
Power Cycling
LED Indicators
Startup
The DR20 LED will fade from
white to “OFF” when initially
connecting.
The LED will fade from red
to white when the RS485
connection is down or if the
reader is not connected to an
Access Control Unit (ACU).
The LED will spin white when
awaiting authorization. It will
momentarily turn green if access
is granted or red if authorization is
denied.
ERR: No ACU
Awaiting Authorization
Unlocked
Auth Reject
Standby

10 DR20 User Manual
Appendix
Mounting Dimensions
1 9
16"
(40 mm)
3 1
4"
(82.5 mm)
1-3/8"
(35mm)

11
DR20 User Manual
DR20 LED Ring Patterns
Color Pattern Feedback Name Feedback Description
White/OFF fade Starting Up Initial connection period, not
yet fully available.
Blue/OFF fade Unregistered -
Red/White fade ERR: No ACU RS485 connection is down.
Red/Yellow ash ERR: Internal Try again.
Dim white, steady Await intent -
Spinning White Awaiting authorization -
Solid Green Unlocked -
Single Red Flash Authorization rejected -
Single Blue/OFF fade Doorbell pressed -