Specifications

December 2013
REQUEST FOR PROPOSALS FOR
PURCHASE AND DELIVERY OF HEAVY-DUTY BUSES
RFP SRTA-2014-01
TECHNICAL SPECIFICATIONS
PAGE-56
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b. The side destination message shall be readable by a person with 20/20 vision from a
distance of 110 feet. The sign shall have viewing cone of equal readability at 65 degrees
on either side of a line perpendicular to the center of the mean plane of the display. The
side sign shall be easily readable from the sidewalk level. The intensity of the
illumination of the display pixels shall appear to the naked eye to be approximately
uniform throughout the full viewing cone.
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20.6 Rear Destination Sign
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a. The rear sign shall be located such that it will provide clear visibility of the sign from the
rear curbside of the coach. The final location of the sign must be approved by the
SRTA.
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b. The rear sign shall be capable of independently displaying alpha-numeric characters. Its
message shall be readable by a person with 20/20 vision, from a distance of not less
than 225 feet. The rear sign shall have a viewing cone of equal readability at 65 degrees
on either side of a line perpendicular to the center of the mean plane of the display. The
intensity of the illumination of the display pixels shall appear, to the naked eye, to be
approximately uniform throughout the full viewing cone.
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c. The sign shall be completely sealed to prevent the entry of dust, dirt, or water from
normal operation, automatic bus washers, and steam cleaning. The sign installation shall
not interfere with driver's vision or reduce access for other component repairs.
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20.7 Operator’s Control Unit (OCU)
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a. The OCU shall be used to view and update display messages. It shall be recess
mounted on the coach vehicle front sign compartment access cover or door. The OCU
shall utilize a multi-key conductive rubber pad keyboard and be designed for transit
operating conditions.
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b. The OCU shall contain a display of at least two lines of 20-character capability. The OCU
shall emit a beep to indicate that a key is depressed. The OCU shall continuously display
the message associated with the selected destination readings (except the emergency
message feature as noted above).
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c. The OCU shall also contain the capability to manually select the block number sign
information (from 1 to 4 alpha-numeric characters) to be sent to the block number sign,
independent of any pre-programmed destination sign message information.
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d. If the IBIS interface is required in the Destination Sign System, an auxiliary RS232 (DB9)
port shall be made optionally available on the OCU underframe for inputs from any
wireless technology that might be envisioned in the future. This auxiliary RS232 port shall
operate at 9600 baud and accept commands from a wireless source (such as Spread
Spectrum receivers) and will set destination sign addresses as if manually operated by
the OCU operator.
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e. If the J1708 interface is selected for the Destination Sign System, an auxiliary J1708 port
shall be made available on the J1708 OCU so that auxiliary J1708 commands may be
provided to the Destination Sign System from a wireless source that conforms to the
J1708 command structure. TwinVision does not provide wireless apparatus, but the
TwinVision Destination Sign System, or approved equal, has the capability of
interfacing via the J1708 link with any such inputs, providing that the apparatus conform
with the appropriate signaling specifications.