Installation Tips
1. Follow all local electrical & building code requirements.
2. The DIR21 is usually wall mounted at light switch height. It
does not normally require a junction box. In order to work it
requires a PS1202 (200 mA) or PS1205 (500 mA) 12 VDC
unregulated power supply, IR31 (single) or IR34 (dual) emitters
and one of the following: DIR54 (decora inwall style, 4 output),
DIR55 (tabletop style, 4 output) or DIR58 (wall mount or SMC
style, 8 output) connection block.
3. Wires can be solid or stranded, shielded or unshielded with a
minimum of 28 gauge for runs under 200’, 22 gauge for runs
under 500’ and 20 gauge for runs up to 1000’. Wires can be
looped from DIR21 to DIR21 or home run. Home runs generally
offer more reliability and future flexibility.
4. DIR21’s can be mixed and matched in larger systems with up
to 10 DIR infrared receivers, such as the Knoll DIR10 or DIR25.
5. When using a DIR connection block, connect the DIR21
+12vdc, GND and SIG terminals to the corresponding DIR55
terminal. Prepare the wire leads to and from the DIR receiver by
stripping about ¼” of the insulation from each of the 3 leads.
Twist the strands tightly together so that they do not stick out
of the connector and cause a short circuit. Be sure to observe
polarity. If you are connecting with the RJ45 connector you may
need a RJ45 paralleling strip to parallel connect the wires from
multiple DIR receivers.
6. Next plug in the single or dual emitters into the DIR
connection block.
7. Then plug in the PS1202 (for up to five receivers) or PS1205
for five to eleven receivers.
8. The infrared system is usually left plugged in all the time (to
an unswitched outlet) as it uses very little power.
9. Test the digital infrared system to see if it is working
properly. If it works only from a very close range or it does not
work at all, first mark where the pot adjustment is on the DIR
connection block blue color pot. This is so you can reset it to
that starting point again. Try adjusting the pot on the
connection block very slightly left and right as you are testing
the receiver with the remote control. This may require two
people. This should correct for the problem. If it still does not
work properly, please call Knoll Systems and ask for infrared
technical
support at 1
800 566 5579.
The help line is
normally open
from 7:30 AM to
5:00 PM
Monday to
Friday Pacific
time.
RJ45
Receiver
CD
IR31A
IR34A
DIR55
PS1202
12 V DC Power Supply
Dish
IR34A
171
Digital
Connection
Block
DIR21
Digital
Infrared
Receiver
RJ45
DIR21
Digital
Infrared
Receiver
RJ45
DIR21
Digital
Infrared
Receiver
RJ45
Note:DIR21’s are
wired in parallel
12V
GND
SIG
DIR
Receiver
Blue
talkback
LED