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Introduction
System overview
■
This section contains the LED Variable Message Sign (VMS) systems description and a general explanation of how each system
operates.
Introduction
The Adaptive LED family of Variable Message Signs is considered to be one of the highest visibility sign systems available. Utilizing the
latest generation of light emitting diode (LED) technology has allowed us to construct a high-reliability, variable message sign display
system.
The LED Variable Message Signs discussed in this manual are built with a combination of 16 x 16 LED modules with a 20mm pitch
configured in a full matrix. These boards can be arranged to form different configurations. The signs are designed to be used as outdoor
highway information signs. The signs utilize a corrosion-resistant front-access housing with control circuitry enclosed within. The only
connections necessary are AC power, Ethernet communication (standard), and three light sensor connections; all connected to the back
of the sign.
General system
The entire sign system may be broken down into four basic subsystems:
•
VMS control system
•
LED brightness control system
•
Environmental control system
•
Electrical system
In the following sections, we explain each of the above-mentioned systems in general terms for ease of understanding. Referring to the
drawings throughout this manual should help you to gain a general understanding of the LED Variable Message Sign system.
What is an LED?
LED-based signs are one of the most versatile and visible display systems available. We use a cluster of small LEDs to form a pixel. The
pixels are arranged in various matrices to form alphanumeric characters. These characters are then linked together to form an LED
display line. The display line format used in AlphaXpress 2020 signs is full matrix, which allows for the display of any alphanumeric
character, including punctuation marks, as well as simple graphics characters.
NTCIP compliant error codes
The NTCIP compliant controllers used in AlphaXpress 2020 signs return information on sign health in the form of a binary number. This
number, or code, is received in the form of a short error status when the sign is queried using IDI Intelligent Controls or other software.
Adaptive provides the Short Error Code Status Translator program that quickly translates the returned value into individual error codes
that the sign is reporting.
Short Error Status
Bit 0:
Reserved
Bit 1:
Communications error
Bit 2:
Power error
Bit 3:
Attached device error
Bit 4:
Lamp error
Bit 5:
Pixel error
Bit 6:
Photocell error
Bit 7:
Message error
A
X
2020 RGB F
LPHA
PRESS
RONT
Bit 8:
Bit 9:
Bit 10:
Bit 11:
Bit 12:
Bit 13:
Bit 14:
A
F
-M
D
S
CCESS
ULL
ATRIX
ISPLAYS
Introduction
Controller error
Temperature warning
Fan error
Critical temperature error
Drum sign rotor error (not applicable to LED signs)
Open cabinet door error
Humidity warning
O
M
IGN
PERATION AND
AINTENANCE
. B)
M
(PN 1523610201
ANUAL
REV
1
1-1
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