node on the LAN. All operations possible by directly connecting a
computer to a controller at the highest level LAN shall be
available through this port.
d.
Telecommunications Interface Port: Provide one additional
telecommunications port in each DDC system permitting remote
communications via telephone. All operations possible by directly
connecting a computer to a controller at the highest level LAN
shall be available through the telecommunications port. A
telecommunications port provided on a digital controller shall be
in addition to the port required for directly connecting a
computer to the controller. Telecommunication baud rate is 28000
minimum.
2.1.1.12
Modem
**************************************************************************
NOTE: When a modem is not required for
communication between the workstation and the DDC
system, delete this paragraph. Add a modem if a
laptop computer is specified with a desktop
workstation.
**************************************************************************
Provide two modems per DDC system to communicate between the digital
control system and the computer workstation. Minimum modem baud rate is 56
Kbaud with v.90 communication standard.
**************************************************************************
NOTE: Indicate control devices that must be in
enclosures with more stringent requirements than
that covered by NEMA 1.
**************************************************************************
2.1.1.13
Digital Controller Cabinet
Each indoor digital controller cabinet shall protect the controller from
dust and rated NEMA 1, unless specified otherwise. Each outdoor digital
controller cabinet shall protect the controller from all outside conditions
and rated NEMA 4. Cabinets for high level controllers shall be hinged door,
lockable, and have offset removable metal back plate.
2.1.1.14
Main Power Switch
Each controller on the highest level LAN or each control cabinet shall have
a main external power switch for isolation of the controller from AC power.
The switch shall be located in the DDC cabinet.
2.1.2
Terminal Control Units
**************************************************************************
NOTE: TCUs are digital controllers, as defined in
Definitions, for Terminal Control Units. TCUs
generally communicate on a lower level LAN.
Designer should specify location of the TCU on the
drawings. Examples of terminal control unit
applications include VAV boxes, fan coil units, and
heat pumps.
**************************************************************************
a.
The same company as the digital controllers shall manufacture
SECTION 15910N
Page 27
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