INSTALLATION INSTRUCTIONS
791-44
AMPLIFIED CONNECTING BLOCK
The Model 791-44 is an Amplified Connecting Block that permits up to 10 single or 10 dual emitters (or any
combination thereof) to be driven directly at high or low power levels. Up to 100 emitter ports may be driven
using 790-00 passive connecting blocks 'daisy chained' from the HIGH IR OUT port. The 791-44 interfaces
all Xantech IR Receivers and Keypads to the emitters along with a power supply in an infrared repeater
system. It can also serve to provide emitter expansion at the output port of other Xantech devices, such
as the 590 Programmable Controller, the 710 Fone Link™ and the 796 Zone Expander. A floating terminal
is provided for "STATUS" line connections.
EMITTERS
791- 44
AMPLIFIED
GND
STATUS
IR IN
CONNECTING BLOCK
®
12 VDC
Talk-back LED
HIGH
IR
OUT
IR
RCVR
Fig. 1 Model 791-44
+12 VDC
Modules & Connecting Blocks
SPECIFICATIONS
• 4-screw plug-in terminal for +12VDC, GND, STATUS, & IR IN.
• Quick connect "IR RCVR" input (3.5mm mini stereo jack).
• Red talk-back LED flashes with IR input signal.
• Ten EMITTER output ports, parallel driven (3.5mm mini mono jacks).
• HIGH IR OUT port for emitter expansion (3.5mm mini mono jack). See Fig. 5.
• Use of included jumpers connect either a 100 or a 470-Ohm resistor in series with each emitter jack for
high or low power operation.
• 282/283/284/286 series of Emitters may be used in any combination.
• Power requirements: 12 volts DC. Uses 781RG or 782-00 Power Supplies (see item 3 below).
• 2.1 mm coaxial power jack.
• Dimensions: 6" W x 2-1/4" D x 15/16" H
INSTALLATION
Fig. 2, next page, illustrates a typical installation of a 791-44 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 because 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 Pads. These may be added virtually without
limit, provided power supply requirements are taken into consideration. See item 3.
791-44
1
2. Be sure to connect the +12V, Output and Gnd of each IR receiver and keypad to the respective
+12VDC, IR IN and GND of the connecting block as shown.
3. Power Supply Requirements. You may combine many Xantech keypads, IR receivers, controllers and
emitters in a system. Having sufficient power supply voltage and current available is critical for proper
operation. Be sure to take the following factors into consideration:
a) The maximum current for proper operation from a 781RG Power Supply is 120 mA (milliamps).
b) The maximum current from a 782-00 Power Supply is 1000 mA.
c) Most IR receivers draw 2 mA without signal and 10 mA with signal (check specs. on actual model).
d) Each 730 Smart Pad draws 7 mA without signal and 65 mA with signal.
e) Each Smart Pad
draws 85 mA with or without signal.
2 or 3
f) Each emitter draws 3 mA in low power mode and 12 mA in high power mode.
g) Add 10 mA for each 794 or 797 Interface module used,
if they are powered from the 791-44.
h) When using combinations of these devices, add up the currents as shown in the following example.
Then choose the power supply or supplies. Do not exceed their maximum current capabilities as
noted above!
+12V
IR OUT
GND
ROOM 3
XANTECH
+12V
IR OUT
GND
+12V
IR OUT
See
Item 4
below
780-10
J-BOX RECEIVER
780-10
J-Box
IR Receiver
Smart
Pad
ST
GND
7 Foot 3-Conductor
Cable with Quick
Connect Stereo Mini Plug
2 or 3
ROOM 1
490-00 Series
Micro Link™
IR Receivers
3-Wire
Cable
+12V
GND
Red
Stripe
IR OUT
3-Wire
Cable
+12V
GND
ROOM 2
480-00
Dinky Link™
IR Receiver
Red
Stripe
IR OUT
For example, the power supply needed for the system
shown in Fig. 2 is arrived at as follows:
a) The no signal current for the five IR receivers is
5 x 2 = 10 mA.
b) Assuming a Smart Pad
keypad, the with or
2 or 3
without signal current is = 85 mA.
Note: Since only one IR source can operate at a
time, the lower current IR receivers (and 730
keypads if used) do not need to have their "with
signal" currents included.
c) The current for one 794 Interface module
V
+12V
GND
IR OUT
490-30 Series
Micro Link™
IR Receivers
GS
RCVR
IR
Connecting Block
OUT
CAUTION:
See text, item 5.
781RG
To 120 VAC
(unswitched)
IR
RCVR
IR
12 VDC
GND
+12 VDC
Power
Supply
Makita
Drape Controller
MAIN ROOM, EQUIPMENT CABINET, ETC.
Fig. 2 A typical 791-44 System
CB12
Connecting Block
OUT
X
PWR
791-44
Amplified
HIGH
+12 VDC
GND
STATUS
IR IN
AMPLIFIED
CONNECTING BLOCK
®
794-60
Universal
Interface
791-44
ROOM 4
7 Foot Quick
Connect Cable
EMITTERS
+12V
XANTECH
+12V
GND2
12345678910
GND1
ON
1 2 3 4 5 6 7 8 910
1 (ON)
0 (OFF)
OUT
IR IN
794
UNIVERSAL INTERFACE
SENDER/
EMITTER
Satellite Receiver
Laser Disc
AV Receiver
CD Changer
Cassette DecK
Dimmer Control
282M
Mouse Emitter
= 10 mA.
d) The current for six emitters is 6 x 3 = 18 mA (in the low power mode. Also the 286 dual emitters
count as only one, since they are in series).
291-10
Hidden Link™
IR Receiver
282M
Mouse Emitter
VCR
282M
Emitter
283M
Blink-IR™
283M
Blink-IR™
286M
Dual Blink-IR™
286M
Dual Blink-IR™
2
791-44
e) Now add up all the currents from steps 1 through 4.
10 mA + 85 mA + 10 mA + 18 mA = 123 mA total.
Therefore, in this case, one 781RG power supply can be used.
NOTE: To avoid current "hogging", never connect regulated 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 “talk-back”
LEDs and 283 Blink IR's (if used) will stay on continuously!
4. For clarity, connections in this illustration 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 791-44 Connecting Block in the main room. This maintains higher power supply
voltage to each IR receiver and keypad for best operation (plus a spare lead).
5. The "IR RCVR" jack on the 791-44 allows the 490-30 (and other Xantech IR Receivers outfitted with
a 3.5 mm stereo mini plug) to be plugged directly into the 791-44. You can do this when the 791-44
Connecting Block is within reach of the IR receiver's 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 equip-ped with a stereo mini plug into the IR RCVR jack.
Do not plug in emitters or other devices. To do so will destroy emitters and damage power supplies!
CAUTION For Shielded Wire and Long Lead Lengths
When using long lengths (> 50 feet) of inter-room shielded cable, it may be necessary to connect a 470 Ohm
1/8 Watt resistor between IR IN (signal) and GND at the 4-screw terminals of the 791-44. Refer to Fig. 3.
The resistor discharges the cable capacitance more
quickly, allowing IR codes of high bit rates to pass without
data loss for consistent command executions.
Emitter Output Ports - High and Low Power Settings
The emitter ports are driven in parallel with a choice of
either a 100 Ohm or a 470 Ohm resistor connected in
series with each port. The 100 Ohm choice delivers high
power output and the 470 Ohm setting is lower power.
high power setting is achieved by plugging a small
The
Shielded Cable(s)
to remote room(s)
Ground Shield as shown
+12 VDC
GND
STATUS
IR IN
470 Ohm
resistor
Fig. 3 Using a 470 Ohm Capacitance
Discharge Resistor
791-44 Input
Terminals
jumper (10 are supplied) onto the pair of pins adjacent to the desired emitter port, as shown in Fig. 4 below.
The low power option is with the jumper removed.
NOTE: The 791-44's are shipped from the factory with the jumpers removed (low power position).
Consider the following factors when choosing high or low power modes:
Modules & Connecting Blocks
1. In the majority of cases, when you mount an emitter on the IR sensor window of the controlled device,
you would use the low power mode (jumpers removed). This prevents overload of high gain sensor
circuits and allows proper operation.
Emitter Ports
Low Power Mode - Jumper Removed
High Power Mode - Jumper Installed
791-44
Carefully insert jumper on vertical
pair of pins when higher power is
needed. See note 2 below.
3
2. The high power mode may be used in installations where you mount the emitters on an adjacent
cabinet wall or door a short distance from the unit's sensor. Another instance is when you place an
emitter inside the device, but cannot place it close to the IR sensor. In such cases, you may need the
extra power of the high power mode to blast through printed circuit boards or around chassis
structures. In addition, when using the lower output 283 and 286 Blink IR's, you may need the high
power mode for some devices that have less sensitive IR sensors.
3. The resistors also provide current sharing to each emitter and allow the use of dual emitters in
combination with single emitters. You may, therefore, connect
any combination of the 282, 283, 284,
& 286 series of emitters in the same system, such as that illustrated in Fig. 2, to drive the desired
number of devices.
When using less than 10 of the emitter ports, you may plug into any of them without regard to order.
Emitter Expansion
If more than 10 emitter ports are needed, you may daisy chain from the HIGH IR OUT port on the 791-44
to the IN/OUT port on a model 790 passive connecting block as follows:
You may daisy chain up to a maximum of
9 model 790's for 100 emitter ports total as
shown in Fig. 5. Be sure to use an adequate power supply. CAUTION: Never
plug emitters directly into the HIGH IR
OUT or HIGH IN/OUTports. To do so will
HIGH
HIGH
OUT
EMITTERS
791-44
AMPLIFIED
CONNECTING BLOCK
+12 VDC
STATUS
IR IN
GND
IR
IR
OUT
RCVR
®
12 VDC
HIGH IR
IN / OUT
EMITTERS
HIGH IR
SIG
GROUND
GND
790
CONNECTING BLOCK
®
HIGH IR
IN / OUT
Connect to
additional
790's in the
same way,
if required.
destroy the emitters!
Fig. 5 Emitter Expansion
Using The "STATUS" Terminal on the
791-44
Fig. 6 illustrates a single zone system where the Status indicator on a Xantech 780-80 IR Receiver and on
a Smart Pad
in a remote room, shows the ON/OFF status of an A/V receiver.
2 or 3
The STATUS and GND terminals on the 791-44 provide convenient tie points for the voltage that drives
STATUS indicators on certain Xantech products (such as the 780-80 IR Receiver & Smart Pad
2 or 3
).
To connect such a system, proceed as follows:
1. Unplug all power plugs for the A/V system.
2. Plug a 12V adapter, such as the Xantech 786-00 Power Supply, into a
switched
AC Outlet on the back
of the A/V receiver (or integrated amplifier, preamp, etc.).
3. Cut the attached plug off the 12V adapter and connect the two leads to the STATUS and GND terminals
on the 791-44 ("+" to STATUS, "–" to GND).
4. Connect the 4-conductor inter-room cable between the 791-44, the Smart Pad
and the 780-80 as
2 or 3
shown in Fig.6.
5. If you wish to adjust the brightness of the Status LED on the 780-80, place a resistor in series with
the STATUS lead as shown in Fig. 6. Use a value that achieves the desired brightness level (usually
1k Ohm to 10k Ohm, 1/8 watt).
NOTE: The brightness of the STATUS LEDs (bank indicators) on the Smart Pad
cannot be adjusted!
2 or 3
Do not use a resister in series with them!
4
791-44
ROOM 1
780-80
IR RECEIVER
+12V
STATUS
GND
IR OUT
®
+12V
STATUS
GND
IR OUT
780-80
J-Box
IR Receiver
Smart
Pad
2 or 3
GND
IR OUT
+12V
STATUS
Add resistor in series with Status line to adjust
brightness, if desired. (See step 5, this page).
Fig. 6 Using the STATUS terminal
in a typical system
+12V
GND
IR OUT
490-30
Micro Link™
IR Receivers
CAUTION:
See text, item 5,
Pg 2.
(–) (+)
Positive
Lead (+)
V
IR
GS
RCVR
Series
791-44
Amplified
Connecting Block
HIGH
OUT
IR
RCVR
IR
+12 VDC
GND
STATUS
IR IN
®
12 VDC
782-00
Power Supply
ROOM 2
CB12
Connecting Block
OUT
X
PWR
EMITTERS
791-44
AMPLIFIED
CONNECTING BLOCK
7 Foot Quick
Connect Cable
291-10
Hidden Link™
IR Receiver
Satellite Receiver
282M
Mouse Emitter
VCR
282M
Emitter
Laser Disc
283M
Blink-IR™
CD Changer
283M
Blink-IR™
Cassette DecK
Modules & Connecting Blocks
283M
To 120 V AC
(unswitched)
AV Receiver
Blink-IR™
786-00
Power
Status Voltage
(12V @ 10mA)
283M
Blink-IR™
Mouse Emitter
Plug into a
Switched
on A/V Receiver (see text)
Supply
AC Outlet
MAIN ROOM, EQUIPMENT CABINET, ETC.
MOUNTING
The 791-44 can be conveniently mounted to a wall or shelf by using the two sheet-metal screws supplied.
You may also apply the 4 self adhesive rubber feet (supplied) if you wish to place the unit on a finished
surface. The unit may be mounted in any orientation to accommodate the installation.
9-15-00
791-44
5
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