Xantech 789-44D User manual

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Modules & Connecting Blocks
789-44D
INSTALLATION INSTRUCTIONS
789-44D
ONE ZONE IN-WALL CONNECTING BLOCK
The Model 789-44D is an in-wall version of the 789-44 Connecting
Block and is trimmed with a standard decorator-style cover plate
(not included). It permits connection of Xantech IR Receivers and
Keypads to four single or four dual emitters, with a power supply,
in infrared repeater systems. It can also provide emitter expan-
sion for various Xantech devices, such as the 590, 710, 796-20,
etc. The STATUS terminal provides a convenient tie point for
voltage to drive the STATUS indicator on certain Xantech prod-
ucts, such as the 780-80 IR Receiver (refer to Fig. 3).
SPECIFICATIONS
•Inputs: 1 - Screw-type, 4-terminal plug-in. 1 - IR RCVR, 3.5mm
stereo mini jack. (See Caution Note, Fig. 4).
•Outputs: 4 - Emitter ports (3.5mm mono mini jacks) parallel
driven.
• Contains a 470-Ohm resistor in series with each emitter output.
• Xantech 282, 283, 284 & 286 series Emitters may be used.
•Power: 12 volts DC, 2.1 mm coaxial power jack. Use a 781C-00 or 782-00 Power Supply. Note: A power
supply is not connected to the 789-44D when it is used as an emitter expander only.
•Dimensions: 1-3/8" W x 1-3/4" D x 4-1/8" H
INSTALLATION
Fig. 2, next page, illustrates a typical installation using the 789-44D in an IR repeater system. A variety of
Xantech IR Receivers and a keypad are shown. When configuring a system, please keep the following
items in mind:
1. More IR Receivers may be wired in parallel, in the same manner as shown, up to a maximum of twelve.
More than twelve is not recommended since IR noise picked up by the many IR receivers may cause
erratic operation and reduce remote control range.
Note: This restriction does not apply to Xantech Smart Pad keypads. These may be added virtually
without limit, provided power supply requirements are taken into consideration. See item 3.
2. Be sure to connect the +12V, Output and Gnd of each IR Receiver and keypad to the respective +12V,
IR IN,GND and STATUS (where applicable) of the connecting block as shown.
3. Xantech Smart Pads may be used by themselves or together with IR receivers as shown. When you
do this however, the higher current requirements of the keypads must be taken into consideration as
follows:
a) Each 730-00 keypad draws 70 mA. A Smartpad2or Smartpad3 draws 85 mA.
b) Each IR receiver draws 10 to 20 mA (check specs. on actual model).
c) The max. current for proper operation from the 781C-00 Power Supply is 120 mA.
d) The max. current from the 782-00 Power Supply is 1000 mA.
e) When using combinations of keypads and receivers, do not exceed the max. current of the power
supplies as noted above.
Emitter
Output
Jacks
2.1mm Power
Jack (12VDC,
center pin +)
IR Receiver
3.5mm Stereo
Mini Input Jack
IR RCVR 12VDC
EMITTERS
Fig. 1 789-44D Connecting Block

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2789-44D
• For example, 1 keypad and several IR receivers could be used with one 781C-00 Power Supply. 12
keypads and 8 (or more) receivers could be used with one 782-00 Power Supply.
• Also, two or three 781C-00 power supplies could be wired in parallel for intermediate numbers of keypads
and receivers.
•CAUTION: The 781C-00 power supply is unregulated and therefore can be paralleled. However,
never
parallel regulated power supplies, such as the 782-00.
• To use additional 781C-00's in parallel, plug the first one into the 12 VDC jack on the 789-44D. Then, on
the additional one(s), simply cut off the 2.1 mm coaxial plug, strip the lead ends and connect them to the
+12V and GND terminals at the 4-terminal input plug. Be sure to observe correct polarity! (White striped
lead is +).
•CAUTION: Do not use unregulated 12V power supply adapters from other manufacturers. These may
deliver excessive voltage to the IR receivers and cause them to “latch-up”. When this occurs, the
“talkback” LEDs and the Blink IR Emitters (if used) will stay on continuously!
4. For clarity, connections in Fig. 2 are shown going to a 3-conductor bus in a "daisy chain" fashion. In
an actual installation, however, it is recommended that 4-conductor "home-runs" be pulled from each
room to the 789-44D Connecting Block in the main room. The home-runs maintain higher power
supply voltage to each IR receiver and keypad, and the extra 4th wire can be used for "STATUS" if
desired (refer to Fig. 3).
5. The "IR RCVR" jack on the 789-44D (see Fig. 1) allows the 490-30 (and other Xantech IR Receivers
with a cable having a 3.5 mm stereo mini plug), to be plugged directly into the 789-44D. You can do
this when the 789-44D Connecting Block is within reach of the 7-foot cable, such as when installing
the 490-30 in a cabinet where the controlled equipment is behind closed doors.
CAUTION: Plug only Xantech IR Receivers equipped with a stereo mini plug into the IR
Receiver jack.
Do not plug in emitters or other devices; to do so will destroy emitters and
damage power supplies!
OUT
V
IR
RCVR
PWR
GS
789-44D
Connecting
Block
Satellite Receiver
AV Receiver
VCR
MAIN ROOM, EQUIPMENT CABINET, ETC.
To 120 V AC
(Unswitched;
see NOTE 1)
782-00
Power
Supply
282M
Emitter
283M
Blink IR™
7 Foot 3-Conductor
Cable with Quick
Connect Stereo
Mini Plug
490-30 Series
Micro Link™
IR Receivers
291-10
Hidden Link™
IR Receiver
GND
OUT
+12V
ROOM 3
780-10
J-Box
IR Receiver
490-00 Series
Micro Link™
IR Receivers
3-Wire
Cable
OUT
GND
+12V
480-00
Dinky Link™
IR Receiver
Red
Stripe
Smart
Pad™
GND OUT +12V
ROOM 2
ROOM 1 ROOM 4
GND
OUT
+12V
286M
Dual Blink IR™
(to other
controlled
devices)
3-Wire
Cable
OUT
GND
+12V
Red
Stripe
+12V
OUTPUT
GND
780-10 J-BOX RECEIVER XANTECH CORPORATION SYLMAR, CA 91342
CAUTION:
See text, item 5.
7 Foot Quick
Connect Cable
CB12
Connecting
Block
282M
Emitter
+12V
GND
IR IN
Fig. 2 A typical 789-44D System

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Modules & Connecting Blocks
789-44D
+12V
STATUS
GND
OUTPUT
780-80 IR RECEIVER
XANTECH CORP. SYLMAR, CA 91342 MADE IN U.S.A.
283M Blink-IR™
Mouse Emitter
To 120 V AC
(Unswitched)
781C-00
Power Supply
789-44D
Connecting
Block
283M
Blink IR™
282M Emitter
Hand Held
Remote
VCR
GND
OUT
+12V
780-80
J-Box
IR Receiver
(rear view)
4-Conductor
Inter-room Cable
(unshielded OK)
STATUS
White Striped
Side ("+")
781C-00
Power
Supply
(12V at
10 mA)
Plug into
Switched AC
Outlet on A/V
Receiver
(see text)
Add resistor in series
with STATUS line to
adjust brightness, if desired.
(See text, next page).
REMOTE ROOM MAIN ROOM
–+
A/V Receiver
Satellite Receiver
+12V
GND
IR IN
STATUS
6. The emitter ports are driven in parallel with a 470-Ohm resistor connected in series with each port.
The resistors ensure proper current sharing to each emitter. When using less than 4 emitters, you may
plug them into any of the 4 emitter ports without regard to order.
7. Because of this current sharing feature, you may plug in any combination of the Xantech 282, 283, 284
& 286 series emitters (up to a maximum of 8 individual emitters) to drive the desired number of devices.
NOTE 1: Be sure the Power Supply is plugged into an un-switched AC outlet. This maintains the
system in "standby" operation so that power-on commands can be sent to the controlled equipment.
Fig. 3 Using the STATUS terminal in a typical system
Using The "STATUS" Terminal on the 789-44D
Fig. 3 illustrates a single zone system where the Status LED on a Xantech 780-80 IR Receiver, in the remote
room, shows the ON/OFF status of an A/V receiver.
• The STATUS and GND terminals on the 789-44D provide convenient tie points for the voltage that drives
STATUS indicators on certain Xantech products (such as the 780-80 IR Receiver).
To connect such a system, proceed as follows:
1. Be sure all power plugs for the A/V system are unplugged before proceeding with the following
connections.
2. Plug a 12V adapter, such as the Xantech 781C-00 Power Supply, into the
switched AC Outlet on the
back of the A/V receiver (or integrated amplifier, preamp, etc.).
3. The 12V leads of the adapter (cut attached plug off) are then connected between the STATUS and
GND terminals on the 789-44D ("+" to STATUS, "–" to GND).
4. You would then connect the 4-conductor inter-room cable between the 789-44D and the 780-80 as
shown in Fig. 3.
5. If you wish to adjust the brightness of the Status LED, place a resistor in series with the STATUS lead
as shown in Fig. 3. Use a value that achieves the desired brightness (usually 1k Ohm to 10k Ohm,
1/8 watt).

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4789-44D
CAUTION NOTE
When using long lengths (> 50 feet) of inter-room shielded cable in your installation, it may be necessary
to connect a 470-Ohm 1/8-Watt resistor between IR IN and GND at the 4-terminal connector of the 789-44D.
Refer to Fig. 4.
The resistor discharges the cable capacitance more quickly, allowing IR codes of high bit rates to pass
without data loss.
+12V
GND
STATUS
IR IN
470-Ohm
resistor
Shielded Cable
to remote room
789-44D
Input
Terminals
Ground Shield as shown
REFINISHING AND MOUNTING
The printed circuit boards and jacks can be easily removed so that the metal plate can be refinished in other
colors, if desired. Simply remove the four screws that secure the PCB's to the metal plate.
The 789-44D can be mounted into any single gang space in standard "J" boxes, using the two 6-32 pan-
head screws supplied.
Fig. 4 470-Ohm Capacitance Discharge Resistor