Glossary
26
RS232:
Standard PC communication type with a maximum cable length of 25’ (7.62 m).
RS422:
Standard differential communication type with a maximum cable length of 4,000’
(1.2 km).
Serial Port:
Connector on the back of the control computer that controls the display
network through either a 9- or a 25-pin serial connector.
Service Control Panel (SCP):
Enclosure that serves as a central point for all data and
power distribution. The SCP contains the VCB, relays, surge suppressors, and the main
power distribution panel.
Vanguard
®
Control Board (VCB):
Internal display component that sends and receives
signals to and from the Vanguard
®
Field Controller. It distributes the signals received from
the Vanguard
®
Field Controller to modules throughout the display. All diagnostic data
from the sensors and modules transmit through the VCB back to the Vanguard
®
Field
Controller.
Vanguard
®
Field Controller:
A component that receives signal information from the
central controller, translates it, and activates the appropriate pixels on the display. It
retains messages in its memory, determines the appropriate display brightness, and keeps
the date and time through an internal clock/calendar. The Vanguard
®
Field Controller
also reads and analyzes the diagnostic data from a variety of sensors. It is located in
either the traffic cabinet or
the display.
