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DIR21
 
 
DIR21 Digital Infrared Receiver Specifications: 
 
Specifications 
Infrared carrier frequency:   30-60kHz 
Indoor reception range:  
150 feet + (45 meters +) 
Outdoor reception range:   35-50 feet (10-15 meters) 
Nominal reception angle:   50 degrees off axis 
Transmission wire maximum length: 1000’ (300m) 
Wire requirements:    
3 conductor, minimum 24 gauge 
      
 
 
 
to 200’, 22 gauge up to 500’  
20 gauge to 1000’ 
Power requirements:  
 Unregulated 12VDC, 40mA 
Dimensions:    
 
1-3/4" x 4" x 1"  
(45mm x 102mm x 26mm)
 
 
Requires 12VDC power supply, emitter(s) and DIR54, 
DIR55 or DIR58 connection block. 
 
 
 
Digital Infrared Receiver  
Installation Instructions v1.1 
 
Warning: To be installed and/or used in accordance with 
appropriate electrical codes and regulations.  
 
Introduction:
 Thank you for your purchase of a Knoll DIR21 
digital infrared receiver. This receiver features a long indoor 
usable range and it can be used in direct sunlight and near 
plasma and other TV’s. It is designed to act as a remote 
receiver of remote control signals that when passed through a 
connection module and emitters, relays remote infrared 
commands to equipment in a distant room. 
 
 
Features: 
  
System
 power
on LED
    IR
Receiver
  Blue
talkback
   LED
•  Inwall junction box design, 
available in white, ivory, almond 
and black colors. 
 
 
 
 
 
•  Will relay almost all remote 
control types (except some B&O 
and Pioneer Elite models). 
Warranty 
 
Knoll Systems warrants its products sold in the USA and Canada by authorized 
Knoll dealers to be free of defects in materials and workmanship. This warranty 
extends for three full years from the date of purchase by the original consumer. 
Any products returned to Knoll Systems and found to be defective by Knoll 
Systems within the warranty period will be repaired or replaced at Knoll Systems 
option, at no charge. Knoll Systems will not be responsible for the actual cost of 
installation or removal of the product, nor for any incidental or consequential 
damages. Some states do not allow the exclusion or limitation of incidental or 
consequential damages, so the above limitation may not apply to you.  This 
warranty gives you specific legal rights.  You may have additional legal rights 
that vary from state to state. 
 
•  Can be connected with almost 
any 3-conductor wire including 
cat 5. 
 
•  Connects with a three-wire 
connector or RJ45 via cat 5 wire. 
 
 
•  Requires DIR54, DIR55 or DIR58 connection module, 
power supply and emitters to work. 
 
 
 
 
•  Up to 10 or more DIR21’s and other compatible models 
can be connected in a single system. 
 
Knoll Systems www.knollsystems.com   
 
145 Tyee Drive Point Roberts, WA 98281 
•  Connects with a three wire connector or RJ45. 
12140 Horseshoe Way Richmond BC V7A 4V4 
tel (604) 272 4555, fax (604) 272 5595 
 
Made in Canada   Knoll Systems All Rights Reserved