1
Remote Control Switchers
INSTALLATION INSTRUCTIONS
SR21
SPEAKER RELAY MODULE
The SR21, Fig. 1, is an IR Remote Controlled A/B Speaker Relay Module. It allows the installer and user
to switch the output of one stereo amplifier between two speaker pairs, or, to switch one speaker pair
between the outputs of two stereo amplifiers. The switching is accomplished by way of infrared commands
originating from a Xantech RC68+ (or RC68) Programmer. It can also be switched by a DC voltage applied
between the CI (control input) and GND terminals. The RC68+ commands are "taught" to learning devices
and passed to the IR IN and GND input terminals of the SR21 via Xantech IR Receivers, Keypads and
Connecting Blocks.
Fig. 1
The SR21
NOTE: The SR21 can also be used as an IR router.
FEATURES AND SPECIFICATIONS
• 4-terminal IR input (IR IN = IR Signal, CI = Control Input, GND and +12VDC) for connection of Xantech
IR Receivers, Smart Pads, Connecting Blocks and other devices.
• Three 4-terminal plug-in connectors for stereo amplifier and speaker connections.
• Isolated Left and Right grounds. Allows use of bridging type power amplifiers.
• 5 Amp/30V DC relay contact rating; provides 200 watts per channel capability into 8 Ohms.
• All plug-in connectors accept wire sizes from 24 to 12 gauge.
• IR CONFIRM LED goes ON only when an RC68 IR command signal activates unit.
• LED indicates A or B switching status.
• Four RC68+ IR commands permit OFF=A, ON=B, Pair, Toggle (A or B), and Momentary operation of
the switching relay.
• IR activated ON condition (ON=B) goes OFF (Off=A) if power is interrupted.
• +3V to +30V DC 1 mA applied to CI terminal will switch unit, instead of IR, if desired.
• Factory preset Group Code number: 50.
• CODE SUB-GROUP switch allows a choice of 8 different groups of the four RC68+ (or RC68) commands
that operate the SR21. This prevents mutual interaction in common IR systems when using more than
one SR21. Also, internal E
2
PROM can be set to different code groups, allowing up to 240 different IR code
combinations if the system uses more than eight SR21's or in combination with CC12's.
• Power: +12V DC @ 50 mA. Use the 781RG Power Supply for each SR21. If IR receivers or keypads are
used on the same 12V line, use the 782-00 Power Supply.
• Flanges, plus supplied screws, permits easy mounting to flat surfaces.
• Dimensions: 5-1/4" x 2-3/8" x 1-7/8" (133mm x 60mm x 46mm)
IR CONFIRM
L+ L– R– R+
L+
L–
R–
R+
CODE
SUB-
GROUP
SR21
SPEAKER RELAY
MODULE
OFF = A
ON = B
R+ R– L– L+
0 1
2
3
4
5
6
7
A
B
IR IN
CI
GND
+12VDC
