Rev. 2 - 03/03
Copyright© 1998-2003, Alpha Communications®, All Rights Reserved
42 Central Drive • Farmingdale NY 11735-1202 • Phone (631) 777-5500 • Fax (631) 777-5599
TOLL-FREE 1-800-666-4800 • Web: www.AlphaCommunications.com • Email: firstname.lastname@example.org
RS840 Room Status
Master Station Expander
The Alpha Communications® RS840 Master
Station Expander utilizes micro-controller tech-
nology to display the status of the dome lights
associated with 24 LI804 Remote Dome Sta-
tions. The main RS816 master station controls
the operation of the RS840 Master Station Ex-
pander. The RS840 connects to the RS816 via
an eight-pin modular type cable (supplied). By
utilizing the RS840 master station expander, the
RS800 system can have a capacity of up to 40
total remote indicating stations.
NOTE: The brightness level(s) of the
LED's in the RS840 may not be iden-
tical to the LED's in the RS816 Master
• Micro-controller technology
Individual LED's for each dome on the associated
• Expands capacity of the RS816 master station
• Can be desk or surface wall mounted
• Spill-proof membrane switch assembly
• High reliability RS485 type data communications
8.50"W (216mm) X 8.50"D (216mm) X
3.50"H (89mm) from finished surface.
High-impact flame retardant type ABS
plastic, Soft Grey color.
Desk or Surface wall mounting.
ARCHITECTS' AND ENGINEERS'
The Room Status System Master Station
Expander(s) shall be Alpha Communications®/
Tektone model RS840 or approved equivalent.
The master station expander(s) shall have 24
remote station indicating capability. The master
station expander(s) shall have the required cir-
cuitry for communication with the model RS816
Master Station, and shall be used in addition to
the RS816 Master Station(s).
The RS840 shall provide visual indication of
dome lamp status, for up to 24 LI804 Remote
Dome Stations. The LED's used for visual indic