Intercom - SM202
General Information

Duo-Com Master Station. Has built-in door chime and voice amplifier. Has momentary door release pushbutton. Surface mounts. Operates on batteries or 6VDC adaptor.
The Alpha Communications Duo-Com series intercom system is our lowest cost master/remote intercom for door entry or any other application requiring a single master and a remote intercom station. The SM202 master station has a built-in amplifier and electronic door chime. It can easily mount right on the surface of the wall (over a single gang electrical \’gem\’ box). A built-in momentary door release button allows hook-up to your own low-voltage door opener (depending upon trans-former used). The optional PK407A door opener relay allows connection to magnetic door locks or other \’fail-safe\’ type door openers. The SM202 is designed to be used with the OR202 remote station, but a wide variety of remote stations is available in ABS plastic, extruded aluminum, stainless steel, polished brass and painted finishes. The SM202 is available in a packaged kit form, along with the OR202 remote and 10 meters of connecting cable. Ask for our model #SM202K Duo-Com kit.


Requires only 2-Wires for Intercom and Electronic Chime
Powers from 4- \’C\’ Batteries or Optional DC Power Supply
Built-in Electronic Chime
Built-in Electric Door Release Pushbutton
Modern Styling
Master can mount over existing Door Chime Station
Wide Variety of Weather-Resistant Remotes

SM202: Height: 7.50″ (191mm)
Width: 5.13″ (131mm)
Projects: 1.63″ (42mm) from surface of wall
OR202: Height: 4.75″ (121mm)
Width: 3.50″ (89mm)
Projects: 1.25″ (32mm) from surface of wall

The intercom system shall be Alpha Communications Duo-Comў series, or approved equal. Master station (model SM202) shall be surface mount and shall include a built-in voice amplifier, electronic chime signal and momentary electric door release pushbutton. Master shall be powered by 4- \’C\’ batteries (or optional SS6C DC power supply adaptor). Master station shall have intercom and chime volume controls and a Talk/Listen switch. The Listen circuit shall automatically time-out after approximately 20 seconds. Outdoor remote station shall be the model OR202, and shall surface mount right on the surface of the wall, or over a single gang electrical \’gem\’ box.Contractor shall furnish and install a (compatible) electric door release, and related power supply, if required.Contractor shall observe all local and national electrical codes.


SM202 MASTER STATION. One (1) maximum per system. Surface mounts right on wall. White ABS plastic finish. Powers off of 4- \’C\’ batteries or optional SS6C DC power supply adaptor.
OR202 PLASTIC REMOTE. Black color. Surface mounts right on wall. With built-in CALL button. No housing required.
—>>> Contact our sales dept. for other remotes available.

CP202SS Stainless Steel Cover plate to protect the OR202 outdoor remote station. Mounts over OR202 remote to provide protection against vandalism.
PK407A SPECIALTY RELAY ADAPTOR. Used when connecting a door opener other than a non-fail-safe type to system, such as a magnetic door opener.
SS6C 6VDC POWER SUPPLY ADAPTOR. Plugs into standard 120VAC outlet, and provides low-voltage power for SM202 intercom functions.
ELECTRIC DOOR OPENER. Must be low-voltage type. Powered by separate low- voltage transformer or power supply (compatible with door opener being used).

Run a 2-conductor twisted pair #22AWG cable from the SM202 master to the OR202 remote station, up to 250 feet. For runs up to 1,000 feet, use a 2-conductor (shielded) #18AWG cable. Run a 2-conductor #18AWG cable from the SS6VDC power supply (if used) to the SM202 master up to 50 feet. Run a 2-conductor #18AWG cable from the SM202 master to the optional electric door opener, up to 50 feet. NOTE: the audio and door opener and transformer cables must be in separate jackets and not in the same cable jacket.

Intercom – SM202
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