Xantech 789-44 Users Manual

INSTALLATION INSTRUCTIONS

789-44

CONNECTING BLOCK

The Model 789-44 provides a quick low cost means of connecting
Xantech IR receivers and keypads to four single or four dual
emitters, with a power supply, in an infrared repeater system. It
can also provide emitter expansion for various Xantech devices,
such as the 590, 710, 792-10, 795-20, 796-20, etc.. The STATUS
terminal provides a convenient tie point for voltage to drive the
STATUS indicator on certain Xantech products, such as the 780­80 IR Receiver (refer to Fig. 3).

Fig. 1 Model 789-44 Connecting Block

SPECIFICATIONS

• Inputs: 1 - Screw type 4-terminal plug-in. 1 - IR Receiver "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 Mini Emitters may be used.

• Power requirements: 12 volts DC. Uses 781RG or 782-00 Power Supplies. Note: A power supply
connected to the 789-44 when it is used as an emitter expander.

• 2.1 mm coaxial power jack.

• Dimensions: 2-15/16" W x 1-3/4" D x 13/16" H

EMITTERS

789-44

CONNECTING BLOCK

VDC

12VDC

+12

GND

STATUS

®

IR IN

IR

RCVR

is not

Modules & Connecting Blocks

INSTALLATION

Fig. 2, illustrates a typical installation using the 789-44 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 SmartPad 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, IR OUT and GND of each IR Receiver and keypad to the respective

+12VDC, IR IN and GND of the connecting block as shown.

3. Xantech SmartPads 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 65 mA. A SmartPad

draws 85ma.

2 or 3

b) Each IR receiver draws 10 to 20 mA (check specs. on actual model).
c) The max. current for proper operation from the 781RG Power Supply is 200 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.

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1

3. (Cont'd)

• For example, 2 keypads and several IR receivers could be used with one 781RG Power Supply and
12 keypads and 8 (or more) receivers could be used with one 782-00 Power Supply.

NOTE: To avoid current "hogging", never connect regulated power supplies, such as the 781RG or
the 782-00, in parallel!

• 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 283 Blink IR's (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 789-44 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 789-44 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 789-44. You can do this when the
789-44 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.

3-Wire
Cable

+12V

GND

490-00

ROOM 1

Series
Micro Link™
IR Receivers

Red
Stripe

IR OUT

3-Wire
Cable

+12V

GND

ROOM 2

480-00

Dinky Link™

IR Receiver

Red
Stripe

IR OUT

Fig. 2 A Typical 789-44 System

+12V

IR OUT

GND

ROOM 3

XANTECH CORPORATION

SYLMAR, CA 91342

+12V

IR OUT

GND

+12V

J-BOX RECEIVER

IR OUT

780-10

780-10

J-Box

IR Receiver

Smart
Pad™

GND

7 Foot 3-Conductor
Cable with Quick
Connect Stereo Mini Plug

490-30

Micro Link™
IR Receivers

Series

+12V

GND

IR OUT

(unswitched; see

V

IR

GS

RCVR

To 120 V AC

NOTE, item 7)

781RG

Power

Supply

Connecting Block

ROOM 4

CB12

OUT

Connecting
Block

PWR

789-44

12VDC

CONNECTING BLOCK

+12 VDC

789-44

GND

STATUS
IR IN

®

RCVR

IR

CAUTION:

See text, item 5.

7 Foot Quick
Connect Cable

EMITTERS

291-10

Hidden Link™
IR Receiver

Satellite Receiver

282M

Emitter

VCR

282M

Emitter

AV Receiver

283M

Blink IR™

286M

Dual Blink IR™

(to other

controlled

devices)

MAIN ROOM, EQUIPMENT CABINET, ETC.

CAUTION: Plug only Xantech IR Receivers equipped with a stereo mini plug into the IR RCVR

Do not plug in emitters or other devices; it will destroy emitter & damage power supplies!

jack.

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 282, 283, 284 & 286

series of emitters (up to a maximum of 8 individual emitters) to drive the desired number of devices.

NOTE: Be sure the 781RG 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.

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789-44